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People > Research Fellow > Curriculum Vita
Combined with Subaru weak lensing measurements, the AMiBA SZE data can be used to derive gas mass fraction as a function of cluster radius
Mass Distribution in and around the Galaxy Cluster MACS J1206.2-0847
Lensing galaxy cluster CL0024+1654 (z=0.395)
Mass Distribution in and around the Galaxy Cluster MACS J1206.2-0847
Full mass profiles of five massive galaxy clusters
AMiBA-7 tSZE maps
Subaru/Suprime-Cam image of the distant cluster RXJ0152 at z=0.83
Umetsu, Keiichi
Research Fellow
photo of Umetsu, Keiichi
Office: ASMAB 1319
TEL: +886-2-2366-5446
FAX: +886-2-2367-7849
Email: keiichi_replace2@_asiaa.sinica.edu.tw

Education and Positions

  • Research Fellow, ASIAA (2014~present)
  • Associate Research Fellow with Tenure, ASIAA (2010~2013)
  • Adjunct Research Fellow, National Taiwan University (2008~2012)
  • Assistant Research Fellow, ASIAA (2006~2009)
  • Faculty Staff Scientist, ASIAA (2005~2006)
  • Postdoctoral Research Fellow, ASIAA (2001~2005)
  • Doctor of Science degree in Astronomy, Tohoku University, Japan (1998~2001)
  • Master of Science degree in Astronomy, Tohoku University, Japan (1996~1998)
  • Bachelor of Science degree in Physics, Tohoku University, Japan (1992~1996)

Honors & Awards

  • Kavli Visiting Scholar, Kavli Institute for Astronomy and Astrophysics, Peking University (2016)
  • Founding Co-I, Hubble Space Telescope Treasury Program (190 orbits to RELICS) (2015~2017)
  • Publications of Significant Research Achievements, Academia Sinica (2015)
  • Publications of Significant Research Achievements, Academia Sinica (2013)
  • Excellent Paper Award, Publications of the Astronomical Society of Japan (2012)
  • Junior Research Investigators Award, Academia Sinica (2011~2012)
  • Publications of Significant Research Achievements, Academia Sinica (2011)
  • Founding Co-I, Hubble Space Telescope Multi-Cycle Treasury Program (524 orbits to CLASH) (2010~2013)
  • Career Development Award, Academia Sinica (2009~2013)
  • Invited Lecturer, International School of Physics "Enrico Fermi", Course CLXXII (2008)

Research Interests

  • Physical and Observational Cosmology
  • Structure Formation in the Universe
  • Clusters of Galaxies
  • Gravitational Lensing
  • Sunyaev-Zel'dovich Effects
  • Cosmic Microwave Background
  • Statistical Methods: Bayesian and Frequentist Approaches
  • Radio Interferometry

My research encompasses the fields of observational cosmology and astrophysics, by focusing on physical and statistical properties of galaxy clusters, the most massive class of objects formed in the universe. Massive clusters contain a wealth of cosmological information about the initial conditions of primordial density fluctuations, the emergence and growth of structure over cosmic time, thereby providing fundamental constraints on the nature of dark matter and dark energy. In this framework, my research is primarily concerned with gravitational lensing effects, whereby the propagation of light rays is deflected as they travel through the expanding universe. Cluster gravitational lensing is a unique and direct probe of the cosmic matter distribution dominated by invisible dark matter and sensitive to the imprint of dark energy, thus offering a direct way to explore the dark side of the universe.

At ASIAA during 2002–2007, I actively engaged in commissioning and scientific operation of the 94 GHz cosmic microwave background interferometer “AMiBA” on Mauna Loa, Hawaii. I was the Science Lead (2005–2010) of the 7-element AMiBA experiment (AMiBA-7).The results of the AMiBA-7 Sunyaev–Zel’dovich effect observations have been published in a series of 12 science papers (ApJ, 2009–2010) and reported in several technical papers (PASP, SPIE, IEEE, 2006–2011).

Recent Journal PapersFor complete list of publications

  1. Koch PM; Ho PTP; ...; Lin KY; ...; Molnar SM; Nishioka H; Umetsu K; et al., "AMiBA 94 GHz SZE Observations: An Initial Measurement of H_0" , ASTROPHYSICAL JOURNAL, 2017, submitted [SCI]
  2. G. Ogrean; ...; K. Umetsu; et al., " Frontier Fields Clusters: Properties of the X-ray-Bright Gas in the Large-Scale Filament Crossing MACS J0717.5+3745 " , Astrophysical Journal Letters, 2016, submitted [SCI]
  3. R.J. van Weeren; ...; K. Umetsu; et al., "Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745" , ASTROPHYSICAL JOURNAL, 2016, submitted [SCI]
  4. A. Molino; ...; K. Umetsu; et al., "CLASH: Accurate Photometric Redshifts with 14 HST bands in Massive Galaxy Cluster Cores" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016, submitted [SCI]
  5. M. Sereno; S. Ettori; M. Meneghetti; J. Sayers; K. Umetsu; J. Merten; I-N. Chiu; A. Zitrin , "CLUMP-3D. Three Dimensional Lensing and Multi-probe Analysis of MACS J1206.2-0847, A Remarkably Regular Cluster" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016, submitted [SCI]
  6. S. R. Siegel; ...; K. Umetsu; N. Czakon; ...; P. M. Koch; ...; K.-Y. Lin; ...; S. M. Molnar; et al., "Constraints on the Mass, Concentration, and Nonthermal Pressure Support of Six CLASH Clusters from a Joint Analysis of X-ray, SZ, and Lensing Data" , ASTROPHYSICAL JOURNAL, 2016, submitted [SCI] (Fulltext)
  7. Y. Mochizuski; ...; K. Umetsu, "Entropy and Pressure Profiles of Abell 478 Cluster out to the Virial Radius with Suzaku" , ASTROPHYSICAL JOURNAL, 2016, submitted [SCI]
  8. G. A. Wegner; K. Umetsu; S. M. Molnar; et al., "The Double Galaxy Cluster Abell 2465 III. X-ray and Weak-lensing Observations" , ASTROPHYSICAL JOURNAL, 2016, submitted [SCI]
  9. Pablo Jimeno; Tom Broadhurst; Ruth Lazkoz; Raul Angulo; Jose Maria Diego; Keiichi Umetsu; Ming-Chung Chu, "Precise Clustering and Density Evolution of redMaPPer Galaxy Clusters versus MXXL Simulation" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 466(3), 2658-2674, 2017-04, accepted [SCI] (Fulltext)
  10. Keiichi Umetsu; Benedikt Diemer, "Lensing Constraints on the Mass Profile Shape and Splashback Radius of Galaxy Clusters" , ASTROPHYSICAL JOURNAL: 836(2), 231, 2017-02, submitted [SCI] (Fulltext)
  11. Fujita, Y; Akahori, T; Umetsu, K; Sarazin, C; Wong, K.-W., "PROBING WHIM AROUND GALAXY CLUSTERS WITH FAST RADIO BURSTS AND THE SUNYAEV-ZEL'DOVICH EFFECT" , ASTROPHYSICAL JOURNAL: 834(1), 13-21, 2017-01, accepted [SCI]
  12. Kai-Yang Lin; Hiroaki Nishioka; Fu-Cheng Wang; Chih-Wei Locutus Huang; Yu-Wei Liao; Jiun-Huei Proty Wu; Patrick M. Koch; Keiichi Umetsu; Ming-Tang Chen; Shun-Hsiang Chan; Shu-Hao Chang; Wen-Hsuan Lucky Chang; Tai-An Cheng; Hoang Ngoc Duy; Szu-Yuan Fu; Chih-Chiang Han; Solomon Ho; Ming-Feng Ho; Paul T.P. Ho; Yau-De Huang; Homin Jiang; Derek Y. Kubo; Chao-Te Li; Yu-Chiung Lin; Guo-Chin Liu; Pierre Martin-Cocher; Sandor M. Molnar; et al., "AMiBA: Cluster Sunyaev-Zel'dovich Effect Observations with the Expanded 13-Element Array" , ASTROPHYSICAL JOURNAL: 830(2), 91, 2016-10 [SCI]
  13. I. Balestra; A. Mercurio; B. Sartoris; ...; K. Umetsu; et al., "CLASH-VLT: Dissecting the Frontier Fields Galaxy Cluster MACS J0416.1-2403 with $\sim800$ Spectra of Member Galaxies" , ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES: 224, (2), 33, 2016-06 [SCI] (Fulltext)
  14. Parry, Wiliam; ...; Keiichi Umetsu, "Dark matter fraction of low-mass cluster members probed by galaxy-scale strong lensing" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 458(2), 1493, 2016-05 [SCI] (Fulltext)
  15. L. Pizzuti; B. Sartoris; S. Borgani; L. Amendola; K. Umetsu; et al., "CLASH-VLT: Testing the Nature of Gravity with Galaxy Clusters Mass Profiles " , JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS: Issue 04, article id. 023, 2016-04 [SCI] (Fulltext)
  16. K. Umetsu; et al., "CLASH: Joint Analysis of Strong-lensing, Weak-lensing Shear and Magnification Data for 20 Galaxy Clusters" , ASTROPHYSICAL JOURNAL: 821(1), 116, 2016-04 [SCI] (Fulltext)
  17. N. Okabe; K. Umetsu; ...; S. I. Tam, "Central Mass Profiles of the Nearby Cool-core Galaxy Clusters Hydra A and A478" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 456(4), 4475-4487, 2016-03 [SCI] (Fulltext)
  18. G. B. Caminha; C. Grillo; P. Rosati; ...; S. Suyu; K. Umetsu; et al., "CLASH-VLT: A Highly Precise Strong Lensing Model of the Galaxy Cluster RX J2248.7−4431 (Abell 1063) and Prospects for Cosmography " , ASTRONOMY & ASTROPHYSICS: 587, A80, 2016-03 [SCI] (Fulltext)
  19. G.P. Smith; P. Mazzotta; N. Okabe; ...; K. Umetsu, "LoCuSS: Testing Hydrostatic Equilibrium in Galaxy Clusters" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 456(1), L74-L78, 2016-02 [SCI] (Fulltext)
  20. Bingxiao Xu; Marc Postman; ...; Keiichi Umetsu; et al., "The Detection and Statistics of Giant Arcs Behind CLASH Clusters" , ASTROPHYSICAL JOURNAL: 817(2), 85, 2016-02 [SCI] (Fulltext)
  21. E. Medezinskil K. Umetsu; et al., "Frontier Fields: Subaru Weak-lensing Analysis of the Merging Galaxy Cluster A2744" , ASTROPHYSICAL JOURNAL: 817(1), 24, 2016-01 [SCI] (Fulltext)
  22. G.A. Ogrean; R.J. van Weeren; C. Jones; ...; K. Umetsu; et al., "Frontier Fields Clusters: Deep Chandra Observations of the Complex Merger MACS J1149.6+2223" , ASTROPHYSICAL JOURNAL: 819(2), 113, 2016 [SCI]
  23. R. J. van Weeren; G. A. Ogrean; C. Jones; ...; K. Umetsu; et al., "The Discovery of Lensed Radio and X-ray Sources behind the Frontier Fields Cluster MACS J0717.5+3745 with the JVLA and Chandra" , ASTROPHYSICAL JOURNAL: 817(2), 98, 2016 [SCI]
  24. N. Okabe; ...; K. Umetsu, "Radio Relics Tracing the Projected Mass Distribution in CIZA J2242.8+5301" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 67(6) 1149, 2015-12 [SCI] (Fulltext)
  25. G. A. Ogrean; ...; K. Umetsu; et al., "Frontier Fields Clusters: Chandra and JVLA View of the Pre-merging Cluster MACS J0416.1-2403" , ASTROPHYSICAL JOURNAL: 812(2), 153, 2015-10 [SCI] (Fulltext)
  26. A. H. Young; ...; N. Czakon; ...; K. Umetsu, "Measurements of the Sunyaev-Zel'dovich Effect in MACS J0647.7+7015 and MACS J1206.2-0847 at High Angular Resolution with MUSTANG" , ASTROPHYSICAL JOURNAL: 809(2), 185, 2015-08 [SCI] (Fulltext)
  27. M. Girardi; A. Mercurio; I. Balestra; ...; K. Umetsu; et al., "CLASH-VLT: Substructure in the Galaxy Cluster MACS J1206.2-0847 from Kinematics of Galaxy Populations" , ASTRONOMY & ASTROPHYSICS: 579, id.A4, 2015-07 [SCI] (Fulltext)
  28. J. Merten; ...; K. Umetsu; ...; N. Czakon; et al., "CLASH: The Concentration-Mass Relation for Galaxy Clusters" , ASTROPHYSICAL JOURNAL: 806(1), 4, 2015-06 [SCI] (Fulltext)
  29. N.G. Czakon; ...; P.M. Koch; K.-Y. Lin; ...; K. Umetsu, "Galaxy Cluster Scaling Relations between BOLOCAM Sunyaev-Zel'dovich Effect and Chandra X-ray Measurements" , ASTROPHYSICAL JOURNAL: 806(1), 18, 2015-06 [SCI] (Fulltext)
  30. K. Umetsu; et al., "Three-dimensional Multi-probe Analysis of the Galaxy Cluster A1689" , ASTROPHYSICAL JOURNAL: 807(2), 207, 2015-06 [SCI] (Fulltext)
  31. Jimeno, Pablo; Broadhurst, Tom; Coupon, Jean; Umetsu, Keiichi; Lazkoz, Ruth, "Comparing gravitational redshifts of SDSS galaxy clusters with the magnified redshift enhancement of background BOSS galaxies" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 448(3), 1999, 2015-04 [SCI] (Fulltext)
  32. X. Huang; ...; K. Umetsu, "CLASH: Extreme Emission-line Galaxies and Their Implication on Selection of High-redshift Galaxies" , ASTROPHYSICAL JOURNAL: 801(1), 12, 2015-03 [SCI] (Fulltext)
  33. A. Zitrin; ...; K. Umetsu; et al., "Hubble Space Telescope Combined Strong and Weak Lensing Analysis of the CLASH Sample: Mass and Magnification Models and Systematic Uncertainties" , ASTROPHYSICAL JOURNAL: 801(1), 44, 2015-03 [SCI] (Fulltext)
  34. C. Grillo; S. H. Suyu; ...; K. Umetsu; et al., "CLASH-VLT: Insights on the Mass Substructures in the Frontier Fields Cluster MACS J0416.1−2403 Through Accurate Strong Lens Modeling" , ASTROPHYSICAL JOURNAL: 800(2), 38, 2015-02 [SCI] (Fulltext)
  35. Jose M. Diego; T. Broadhurst; ...; K. Umetsu; et al., "A Free-Form Lensing Grid Solution for A1689 with New Mutiple Images" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 446(1), 683-704, 2015-01 [SCI] (Fulltext)
  36. M. Meneghetti; ...; K. Umetsu; ...; N. Czakon; et al., "The MUSIC of CLASH: Predictions on the Concentration-Mass Relation" , ASTROPHYSICAL JOURNAL: 797(1), 34, 2014-12 [SCI] (Fulltext)
  37. R. J. Bouwens; ...; K. Umetsu; ...; et al., "A Census of Star-Forming Galaxies in the z~9-10 Universe based on HST+Spitzer Observations over 19 CLASH Clusters: Three Candidate z~9-10 Galaxies and Improved Constraints on the Star Formation Rate Density at z~9.2" , ASTROPHYSICAL JOURNAL: 795(2), 126, 2014-11 [SCI] (Fulltext)
  38. K. Umetsu; ...; N. Czakon; et al., "CLASH: Weak-Lensing Shear-and-Magnification Analysis of 20 Galaxy Clusters" , ASTROPHYSICAL JOURNAL: 795(2), 163, 2014-11 [SCI] (Fulltext)
  39. M. Annunziatella; ...; K. Umetsu; et al., "CLASH-VLT: The stellar mass function and stellar mass density profile of the z=0.44 cluster of galaxies MACS J1206.2-0847 " , ASTRONOMY & ASTROPHYSICS: 571, 80, 2014-10 [SCI] (Fulltext)
  40. M. Donahue, G.M. Voit, A. Mahdavi, K. Umetsu; ...; N. Czakon; et al., "CLASH-X: A Comparison of Lensing and X-ray Techniques for Measuring the Mass Profiles of Galaxy Clusters" , ASTROPHYSICAL JOURNAL: 794(2), 136, 2014-10 [SCI] (Fulltext)
  41. N. Okabe; K. Umetsu; ...; et al., "Universal Profiles of the Intracluster Medium from Suzaku X-Ray and Subaru Weak-Lensing Observations" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 66(5), 99, 2014-10 [SCI] (Fulltext)
  42. L.D. Bradley; ...; K. Umetsu; et al., "CLASH: A Census of Magnified Star-Forming Galaxies at z ~ 6-8" , ASTROPHYSICAL JOURNAL: 792(1), 76, 2014-09 [SCI] (Fulltext)
  43. C. Grillo; ...; K. Umetsu; et al., "CLASH: Extending Galaxy Strong Lensing to Small Physical Scales with Distant Sources Highly-magnified by Galaxy Cluster Members" , ASTROPHYSICAL JOURNAL: 786(1), 11, 2014-05 [SCI] (Fulltext)
  44. V. Presotto; M.Girardi; M. Nonino; ...; K. Umetsu; et al., "Intra Cluster Light Properties in the CLASH-VLT Cluster MACSJ1206.2-0847" , ASTRONOMY & ASTROPHYSICS: 565, 126, 2014-05 [SCI] (Fulltext)
  45. B. Patel; ...; K. Umetsu; et al., "Three Gravitationally Lensed Supernovae Behind CLASH Galaxy Clusters" , ASTROPHYSICAL JOURNAL: 786(1), 9, 2014-05 [SCI] (Fulltext)
  46. B. Sartoris; ...; K. Umetsu; ...; N. Czakon; et al., "CLASH-VLT: Constraints on the Dark Matter Equation of State from Accurate Measurements of Galaxy Cluster Mass Profiles" , Astrophysical Journal Letters: 783(1), L2, 2014-03 [SCI] (Fulltext)
  47. R. Smit; ...; K. Umetsu; et al., "Evidence for Ubiquitous High-equivalent-width Nebular Emission in z ~ 7 Galaxies: Toward a Clean Measurement of the Specific Star-formation Rate Using a Sample of Bright, Magnified Galaxies" , ASTROPHYSICAL JOURNAL: 784(1), 58, 2014-03 [SCI] (Fulltext)
  48. S. Jouvel; ...; K. Umetsu , "CLASH: Photometric redshifts with 16 HST bands in galaxy clusterfields" , ASTRONOMY & ASTROPHYSICS: 562, 86, 2014-02 [SCI] (Fulltext)
  49. A. Monna; S. Seitz; N. Greisel; ...'; K. Umetsu; et al., "CLASH: z~6 Young Galaxy Candidate Quintuply Lensed by the Frontier Field Cluster RXC J2248.7-4431" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 438(2), 1417-1434, 2014-02 [SCI] (Fulltext)
  50. J. Sayers; ...; N. Czakon; ...; P. M. Koch; K.-Y. Lin; ...; S. M. Molnar; ...; K. Umetsu, "A Measurement of the Kinetic Sunyaev-Zel'dovich Signal towards MACS J0717.5+3745" , ASTROPHYSICAL JOURNAL: 778(1), 52, 2013-11 [SCI] (Fulltext)
  51. Balestra, I.; ...; Umetsu, K., "CLASH-VLT: spectroscopic confirmation of a z=6.11 quintuplylensed galaxy in the Frontier Fields Cluster RXC J2248.7-4431" , ASTRONOMY & ASTROPHYSICS: 559, L9, 2013-11 [SCI]
  52. A. Biviano; ..; K. Umetsu; et al., "CLASH-VLT: The mass, velocity-anisotropy, and pseudo-phase-space density profiles of the z=0.44 galaxy cluster MACS J1206.2-0847" , ASTRONOMY & ASTROPHYSICS: 558, 1, 2013-10 [SCI] (Fulltext)
  53. D. Lemze; ...; K. Umetsu; et al., "The Contribution of Halos with Different Mass Ratios to the Overall Growth of Cluster-sized Halos" , ASTROPHYSICAL JOURNAL: 776(2), 91, 2013-10 [SCI] (Fulltext)
  54. Thomas Eichner, Stella Seitz, Sherry H. Suyu, Aleksi Halkola, Keiichi Umetsu; ...; et al., "Galaxy Halo Truncation and Giant Arc Surface Brightness Reconstruction in the Cluster MACSJ1206.2-0847" , ASTROPHYSICAL JOURNAL: 774(2), 124, 2013-09 [SCI] (Fulltext)
  55. S.M. Molnar; T. Broadhurst; K. Umetsu; et al., "Tangential Velocity of the Dark Matter in the Bullet Cluster from Precise Lensed Image Redshifts" , ASTROPHYSICAL JOURNAL: 774(1), 70, 2013-09 [SCI] (Fulltext)
  56. J. Coupon; T. Broadhurst; K. Umetsu, "Cluster Lensing Profiles Derived from a Redshift Enhancement of Magnified BOSS-Survey Galaxies" , ASTROPHYSICAL JOURNAL: 772(1), 65, 2013-07 [SCI] (Fulltext)
  57. N. Okabe; G.P. Smith; K. Umetsu; M. Takada; T. Futamase, "LoCuSS: The Mass Density Profile of Massive Galaxy Clusters at z=0.2" , Astrophysical Journal Letters: 769(2), L35, 2013-05 [SCI] (Fulltext)
  58. Keiichi Umetsu, "Model-Free Multi-Probe Lensing Reconstruction of Cluster Mass Profiles" , ASTROPHYSICAL JOURNAL: 769(2), 13, 2013-05 [SCI] (Fulltext)
  59. Liao Y-W; Lin K-Y; Huang Y-D; Wu JHP; Ho PTP; Chen M-T; Huang CWL; Koch PM; Nishioka H; Cheng T-A; Fu S-Y; Liu G-C; Molnar SM; Umetsu K; Wang F-C; Chang Y-Y; Han C-C; Li C-T; Martin-Cocher P; Oshiro P, "Platform Deformation Phase Correction for the AMiBA-13 Co-planar Interferometer" , ASTROPHYSICAL JOURNAL: 769(1), 71, 2013-05 [SCI]
  60. Sayers, J.; ...; Koch, P.M.; Lin, K.-Y.; ...; Molnar, S.M.; ...; Umetsu, K.; et al., "Sunyaev-Zel'dovich-measured Pressure Profiles from the Bolocam X-ray/SZ Galaxy Cluster Sample" , ASTROPHYSICAL JOURNAL: 768(2), 177, 2013-05 [SCI] (Fulltext)
  61. M. Sereno; K. Umetsu; et al., "On mass and shape of galaxy clusters by comparison of X-ray, Sunyaev-Zel'dovich effect, and gravitational lensing observations" , ASTRONOMISCHE NACHRICHTEN: Vol.334, Issue 4-5, p.445, 2013-04 [SCI] (Fulltext)
  62. Kazuya Ichikawa, Kyoko Matsushita, Nobuhiro Okabe; ...; Keiichi Umetsu, "Suzaku Observations of the Outskirts of A1835: Deviation from Hydrostatic Equilibrium" , ASTROPHYSICAL JOURNAL: 766(2), 90, 2013-04 [SCI] (Fulltext)
  63. Sayers J; ...; Koch PM; Lin KY; ...; Umetsu K, "The Contribution of Radio Galaxy Contamination to Measurements of the Sunyaev-Zel'dovich Decrement in Massive Galaxy Clusters at 140 GHz with Bolocam" , ASTROPHYSICAL JOURNAL: 764(2), 152, 2013-02 [SCI] (Fulltext)
  64. Zitrin, A.; Meneghetti, M.; Umetsu, K.; ...; et al., "CLASH: The Enhanced Lensing Efficiency of the Highly Elongated Merging Cluster MACS J0416.1-2403" , Astrophysical Journal Letters: 762(2), L30, 2013-01 [SCI] (Fulltext)
  65. Sereno, M., Ettori, S., Umetsu, K, & Baldi, A, "Mass, shape and thermal properties of Abell 1689 using a multiwavelength X-ray, lensing and Sunyaev-Zel'dovich analysis" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 428(3),.2241-2254, 2013-01 [SCI] (Fulltext)
  66. Elisabeth Krause, Tzu-Ching Chang, Olivier Dor'e, Keiichi Umetsu, "The Weight of Emptiness: The Gravitational Lensing Signal of Stacked Voids" , Astrophysical Journal Letters: 762(2), L20, 2013-01 [SCI] (Fulltext)
  67. E. Medezinski; K. Umetsu; ...; N. Czakon; et al., "CLASH: Complete Lensing Analysis of the Largest Cosmic Lens MACS J0717.5+3745 and Surrounding Structures" , ASTROPHYSICAL JOURNAL: 777(1),43, 2013 [SCI] (Fulltext)
  68. Tony Mroczkowski, ..., Patrick M. Koch, Kai-Yang Lin, ..., Keiichi Umetsu, ..., "A Multi-Wavelength Study of the Sunyaev-Zel'dovich Effect in the Triple-Merger Cluster MACS J0717.5+3745 with MUSTANG and BOLOCAM" , ASTROPHYSICAL JOURNAL: 716(1), 47, 2012-12 [SCI] (Fulltext)
  69. A. Zitirn, M. Bartelmann, K. Umetsu, M. Oguri, & T, Broadhurst , "Miscentring in Galaxy Clusters: Dark Matter to Brightest Cluster Galaxy Offsets in 10,000 SDSS Clusters" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 426 (4), 2944-2956, 2012-11 [SCI] (Fulltext)
  70. Wei Zheng, ..., Keiichi Umetsu, ..., "A Magnified Young Galaxy from about 500 Million Years after the Big Bang" , NATURE: 489, 406-408, 2012-09 [SCI] (Fulltext)
  71. Dan Coe; Keiichi Umetsu; ...; et al., "CLASH: Precise New Constraints on the Mass Profile of Abell 2261" , ASTROPHYSICAL JOURNAL: 757(1), 22, 2012-09 [SCI] (Fulltext)
  72. Umetsu K; ...; Koch PM; Lin KY; Molnar SM; et al,, "CLASH: Mass Distribution in and around MACS J1206.2-0847 from a Full Cluster Lensing Analysis" , ASTROPHYSICAL JOURNAL: 755(1), 56, 2012-08 [SCI] (Fulltext)
  73. Hanami, Hitoshi; Ishigaki, Tsuyoshi; Fujishiro, Naofumi; Nakanishi, Kouichiro; Miyaji, Takamitsu; Krumpe, Mirko; Umetsu, Keiichi; Ohyama, Youichi; ... et al., "Star Formation and AGN activity in Galaxies classified using the 1.6 um Bump and PAH features at z = 0.4-2" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 64(4), 70, 2012-08 [SCI] (Fulltext)
  74. Zitrin A, Broadhurst T, Bartelmann M, Rephaeli Y, Oguri M, Benitez N, Hao J, Umetsu K, "The Universal Einstein Radius Distribution from 10,000 SDSS Clusters" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 423(3), 2308-2324, 2012-07 [SCI] (Fulltext)
  75. J. Sayers, N. G. Czakon, C. Bridge, S. R. Golwala, P. M. Koch, K.-Y. Lin, S. M. Molnar, K. Umetsu , "Bolocam Observations of Two Unconfirmed Galaxy Cluster Candidates from the Planck Early SZ Sample" , Astrophysical Journal Letters: 749(1), L15, 2012-04 [SCI] (Fulltext)
  76. A. Zitrin, ..., K. Umetsu et al., "CLASH: New Multiple Images Constraining the Inner Mass Profile of MACS J1206.2-0847" , ASTROPHYSICAL JOURNAL: 749(2), 97, 2012-04 [SCI] (Fulltext)
  77. M. Postman; ...; K. Umetsu; ..., "The Cluster Lensing And Supernova Survey with Hubble: An Overview" , ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES: 199(2), 25, 2012-04 [SCI] (Fulltext)
  78. Adi Zitrin, Yoel Rephaeli, Sharon Sadeh, Elinor Medezinski, Keiichi Umetsu, Jack Sayers, Mario Nonino, Andrea Morandi, Alberto Molino, Nicole Czakon, Sunil R. Golwala, "Cluster-Cluster Lensing and the Case of Abell 383" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 420(2), 1621-1629, 2012-02 [SCI] (Fulltext)
  79. Zitrin, A., Broadhurst, T., Coe, D., Umetsu, K., Postman, M. et al., "THE CLUSTER LENSING AND SUPERNOVA SURVEY WITH HUBBLE (CLASH): STRONG-LENSING ANALYSIS OF A383 FROM 16-BAND HST/WFC3/ACS IMAGING" , ASTROPHYSICAL JOURNAL: 742(2), 117, 2011-11-15 [SCI] (Fulltext)
  80. Andrea Morandi, Marceau Limousin, Yoel Rephaeli, Keiichi Umetsu, Rennan Barkana, Tom Broadhurst, Hakon Dahle, "Triaxiality and non-thermal gas pressure in Abell 1689" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 416(4), 2567-2573, 2011-10 [SCI] (Fulltext)
  81. Sereno M & Umetsu K, "Weak and Stong Lensing Analysis of the Trixial Matter Distribution of A1689" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 416(4), 3187-3200, 2011-10 [SCI] (Fulltext)
  82. Umetsu K; Broadhurst T; Zitrin A; Medezinski E; Coe D; Postman M, "A Precise Cluster Mass Profile Averaged from the Highest Quality Lensing Data" , ASTROPHYSICAL JOURNAL: 738(1), 41, 2011-09 [SCI] (Fulltext)
  83. E. Medezinski, T. Broadhurst, K. Umetsu, N. Benitez, & A. Taylor , "A Weak Lensing Detection of the Cosmological Distance-Redshift Relation behind Three Massive Clusters" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 414(3), 1840-1850, 2011-07 [SCI] (Fulltext)
  84. Umetsu K, Broadhurst T, Zitrin A, Medezinski E, Hsu L-Y, "Cluster Mass Profiles from a Bayesian Analysis of Weak Lensing Distortion and Magnification Measurements: Applications to Subaru Data" , ASTROPHYSICAL JOURNAL: 729(2), 127-142, 2011-03 [SCI] (Fulltext)
  85. Patrick M. Koch, Philippe Raffin, Yau-De Huang, Ming-Tang Chen, Chih-Chiang Han, Kai-Yang Lin, Pablo Altamirano, Christophe Granet, Paul T.P.Ho, Chih-Wei L.Huang, Michael Kesteven, Chao-Te Li, Yu-Wei Liao, Guo-Chin Liu, Hiroaki Nishioka, Ching-Long Ong, Peter Oshiro, Keiichi Umetsu, Fu-Cheng Wang, Jiun-Huei Proty Wu, "1.2 m Shielded Cassegrain Antenna for Close-Packed Radio Interferometer" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC: 123(900) 198-212, 2011-02 [SCI] (Fulltext)
  86. Zitrin A, Broaodhurst T, Coe D, Liesenborgs J, Ben'tez N, Rephaeli Y, Ford Y, & Umetsu K, "Strong-Lensing Analysis of MS 1358.4+6245: New Multiple Images and Implications for the Well-Resolved z=4.92 Galaxy" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: (413) 1753-1763, 2011-02 [SCI] (Fulltext)
  87. Molnar SM; Umetsu K; ...; Ho PTP; ...; Koch PM; [Liao YWV; Lin KY; Liu GC; Nishioka H; et al., "Constraining Intra-Cluster Gas Models with AMiBA13" , ASTROPHYSICAL JOURNAL: 723(2), 1272-1285, 2010-11 [SCI] (Fulltext)
  88. Zitrin A, Broadhurst T, Umetsu K, et al., "Full Lensing Analysis of Abell 1703: Comparison of Independent Lens-Modelling Techniques" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 408(3), 1916-1927, 2010-11 [SCI] (Fulltext)
  89. Molnar SM, Chiu I-N, Umetsu K, Chen P, Hearn N, Broadhurst T, Bryan G, Shang C, "Testing Strict Hydrostatic Equilibrium in Simulated Clusters of Galaxies: Implications to Abell 1689" , ASTROPHYSICAL JOURNAL: 724(1), L1-L4, 2010-11 [SCI] (Fulltext)
  90. N. Okabe, Y-Y. Zhang, A. Finoguenov, M. Takada, G. P. Smith, K. Umetsu, & T. Futamase, " LoCuSS: Calibrating Mass-Observable Scaling Relations for Cluster Cosmology with Subaru Weak Lensing Observations" , ASTROPHYSICAL JOURNAL: 721(1), 875-885, 2010-09 [SCI] (Fulltext)
  91. G.-C. Liu; M. Birkinshaw; J.-H.P. Wu; P.T.P. Ho; C.-W.L. Huang; Y.-W. Liao; K.-Y. Lin; S.M. Molnar; H. Nishioka; P.M. Koch; K. Umetsu; F.-C. Wang; P. Altamirano; C.-H. Chang; S.-H. Chang; S.-W. Chang; M.-T. Chen; C.-C. Han; Y.-D. Huang; Y.-J. Hwang; H. Jiang; M. Kesteven; D. Kubo; C.-T. Li; P. Martin-Cocher; P. Oshiro; P. Raffin; T. Wei; W. Wilson , "Contamination of the Central Sunyaev-Zel'dovich Decrements in AMiBA Galaxy Cluster Observations" , ASTROPHYSICAL JOURNAL: 720(1), 608-613, 2010-09 [SCI] (Fulltext)
  92. Li CT; Kubo DY;...; Lin KY; Chen MT; Ho PTP; Chen CC; Han CC; Oshiro P; Martin-Cocher P; Chang CH; Chang SH; Altamirano P; Jiang H;...; Wang H; ...; Chang SW; Huang YD; Hwang YJ; ...; Koch P; Liu GC; Nishioka H; Umetsu K; Wei T; Wu JHP, "AMiBA Wideband Analog Correlator" , Astrophysical Journal: 716(1), 746-757, 2010-06 [SCI] (Fulltext)
  93. Huang CWL; ...; Ho PTP; Koch PM; ...; Lin KY; Liu GC; Molnar SM; Nishioka H; Umetsu K; ...; Altamirano P; ...; Chang CH; Chang SH; Chang SW; Chen MT; ...; Han CC; Huang YD; Hwang YJ; Jiang H; ...; Kubo D; Li CT; Martin-Cocher P; Oshiro P; Raffin P; Wei T; et al., "AMiBA: scaling relations between the integrated Compton-y and X-ray derived temperature, mass, and luminosity" , ASTROPHYSICAL JOURNAL: 716(1), 758-765, 2010-06 [SCI] (Fulltext)
  94. Medezinski E; Broadhurst T; Umetsu K;Oguri M; et al., "Detailed Cluster Mass and Light Profiles of A1703, A370, & RXJ1347-11 from Deep Subaru Imaging" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 405(1), 257-273, 2010-06 [SCI] (Fulltext)
  95. Okabe N; Takada M; Umetsu K; et al., "LoCuSS: Subaru Weak Lensing Study of 30 Galaxy Clusters" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 62(3), 811-870, 2010-06 [SCI] (Fulltext)
  96. Madoka Kawaharada, Nobuhiro Okabe, Keiichi Umetsu, Motokazu Takizawa, Kyoko Matsushita, Yasushi Fukazawa, Takashi Hamana, Satoshi Miyazaki, Kazuhiro Nakazawa, Takaya Ohashi, "Suzaku Observation of Abell 1689: Anisotropic Temperature and Entropy Distributions Associated with the Large-Scale Structure" , ASTROPHYSICAL JOURNAL: 714(1), 423-441, 2010-05 [SCI] (Fulltext)
  97. Umetsu K; ...; Okabe N; Hsieh BC; Molnar SM, "The Mass Structure of the Galaxy Cluster Cl0024+1654 from a Full Lensing Analysis of Joint Subaru and ACS/NIC3 Observations" , ASTROPHYSICAL JOURNAL: 714(2), 1470-1496, 2010-05 [SCI] (Fulltext)
  98. Liao Y-W; Wu J-HP; Ho PTP; Huang C-WL; Koch PM; Lin K-Y; Liu G-C; Molnar SM; Nishioka H; Umetsu K; Wang F-C; Altamirano P; Birkinshaw M; Chang C-H; Chang S-H; Chang S-W; Chen M-T; Chiueh T; Han C-C; Huang Y-D; Hwang Y-J; Jiang H; Kesteven M; Kubo DY; Li C-T; Martin-Cocher P;Oshiro P; Raffin P; Wei T; Wilson W, "AMiBA: Sunyaev-Zeldovich Effect Derived Properties and Scaling Relations of Massive Galaxy Clusters" , ASTROPHYSICAL JOURNAL: 713(1), 584-591, 2010-04 [SCI] (Fulltext)
  99. Lemze D; ...; Umetsu K, "Dynamical Study of A1689 from Wide-Field VLT/VIMOS Spectroscopy: Mass Profile, Concentration Parameter, and Velocity Anisotropy" , ASTROPHYSICAL JOURNAL: 701(2), 1336-1346, 2009-08 [SCI] (Fulltext)
  100. Haines CP; ...; Umetsu K; et al., "LoCuSS: Luminous infrared galaxies in the merging cluster Abell 1758 at z=0.28" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 396(3), 1297-1307, 2009-07 [SCI] (Fulltext)
  101. Zitrin A; Broadhurst T; Umetsu K; et al., "New Multiply-Lensed Galaxies Identified in ACS/NIC3 Observations of Cl0024+1654, Using an Improved Mass Model" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 396(4), 1985-2002, 2009-07 [SCI] (Fulltext)
  102. Chen MT; Li CT; Hwang YJ; et al., "AMiBA: Broadband Heterodyne CMB Interferometry" , ASTROPHYSICAL JOURNAL: 694(2), 1664-1669, 2009-04 [SCI] (Fulltext)
  103. Lin KY; Li CT; Ho PTP; et al., "AMiBA: System Performance" , ASTROPHYSICAL JOURNAL: 694(2), 1629-1636, 2009-04 [SCI] (Fulltext)
  104. Wu JHP; Ho PTP; ...; Koch PM; ...; Lin KY; Liu GC; Molnar SM; Nishioka H; Umetsu K; ...; Altamirano P; ...; Chang CH; Chang SH; Chang SW; Chen MT; ...; Han CC; Huang YD; Hwang YJ; Jiang HM; ...; Kubo DY; ...; Li CT; Martin-Cocher P; Oshiro P; Raffin P; Wei TS; et al., "Array for Microwave Background Anisotropy: Observations, Data Analysis, and Results for Sunyaev-Zel'Dovich Effects" , ASTROPHYSICAL JOURNAL: 694(2), 1619-1628, 2009-04 [SCI] (Fulltext)
  105. Umetsu K; ...; Liu GC; Ho PTP; Koch PM; et al., "Mass and Hot Baryons in Massive Galaxy Clusters from Subaru Weak Lensing and AMiBA Sunyaev-Zel'dovich Effect Observations" , ASTROPHYSICAL JOURNAL: 694(2), 1643-1663, 2009-04 [SCI] (Fulltext)
  106. Nishioka H; ...; Ho PTP; Koch PM; Lin K-Y; et al., "Tests of AMiBA Data Integrity" , ASTROPHYSICAL JOURNAL: 694(2), 1637-1642, 2009-04 [SCI] (Fulltext)
  107. Koch PM; et al., "The AMiBA Hexapod Telescope Mount" , ASTROPHYSICAL JOURNAL: 694(2), 1670-1684, 2009-04 [SCI] (Fulltext)
  108. Ho PTP; Altamirano P; Chang CH; Chang SH; et al., "The Yuan-Tseh Lee Array for Microwave Background Anisotropy" , ASTROPHYSICAL JOURNAL: 694(2), 1610-1618, 2009-04 [SCI] (Fulltext)
  109. Umetsu K; Broadhurst T, "Combining Lens Distortion and Depletion to Map the Mass Distribution of A1689" , ASTROPHYSICAL JOURNAL: 684(1), 177-203, 2008-09 [SCI] (Fulltext)
  110. Broadhurst T; Umetsu K; Medezinski E; Oguri M; et al., "Comparison of Cluster Lensing Profiles with Lambda CDM Predictions" , ASTROPHYSICAL JOURNAL: 685(1), L9-L12, 2008-09 [SCI] (Fulltext)
  111. Okura Y; Umetsu K; Futamase T, "A Method for Weak Lensing Flexion Analysis by the HOLICs Moment Approach" , ASTROPHYSICAL JOURNAL: 680(1), 1-16, 2008-06 [SCI] (Fulltext)
  112. Umetsu K; Okura Y; Futamase T, "A Moment Method for Measuring the Higher-Order Weak Gravitational Lensing Effects" , MODERN PHYSICS LETTERS A: 23(17-20), 1506-1513, 2008-06 [SCI] (Fulltext)
  113. Wu JHP; Chiueh TH; ...; Chang C-H; Chang S-H; Chang S-W; et al., "AMiBA: First-Year Results for Sunyaev-Zel'dovich Effect" , MODERN PHYSICS LETTERS A: 23(17-20), 1675-1686, 2008-06 [SCI] (Fulltext)
  114. Ho PTP; Altimirano P;...; Chang S-W; Chang C-H; Chen MT; et al., "The Yuan Tseh Lee AMiBA Project" , MODERN PHYSICS LETTERS A: 23(20), 1243-1251, 2008-06 [SCI] (Fulltext)
  115. Okabe N; Umetsu K, "Subaru Weak Lensing Study of Seven Merging Clusters of Galaxies: Distributions of Mass and Baryon" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 60(2), 345-375, 2008-04 [SCI] (Fulltext)
  116. Medezinski E.; Broadhurst T.; Umetsu K.; Coe D., "Using Weak-Lensing Dilutuion to Measure Light Properties of A1689" , MODERN PHYSICS LETTERS A: 23(17-20), 1521-1528, 2008 [SCI] (Fulltext)
  117. Umetsu K; Takada M; Broadhurst T, "Probing the Cluster Mass Distribution using Subaru Weak Lensing Data" , MODERN PHYSICS LETTERS A: 22(25-28), 2099-2106, 2007-09 [SCI] (Fulltext)
  118. Medezinski E; Broadhurst T; Umetsu K; et al., "Using Weak Lensing Dilution to Improve Measurements of the Luminous and Dark Matter in A1689" , ASTROPHYSICAL JOURNAL: 663(2), 717-733, 2007-07 [SCI] (Fulltext)
  119. Okura Y; Umetsu K; Futamase T, "A New Measure for Weak Lensing Flexion" , ASTROPHYSICAL JOURNAL: 660(2), 995-1002, 2007-05 [SCI] (Fulltext)
  120. Umetsu K; Tanaka M; Kodama T; et al., "Discovery of a Stronglly Lensed Galaxy at z=3.9 behind a z=0.83 Galaxy Cluster" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 57(6), 877-880, 2005-12 [SCI] (Fulltext)
  121. Oguri M; Takada M; Umetsu K; Broadhurst T, "Can the Steep Mass Profile of A1689 Be Explained by a Triaxial Dark Halo?" , ASTROPHYSICAL JOURNAL: 632(2), 841-847, 2005-10 [SCI] (Fulltext)
  122. Tanaka M; Kodama T; ...; Umetsu K; et al., "The build-up of the colour-magnitude relation as a function of environment" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 362(1), 268-288, 2005-09 [SCI] (Fulltext)
  123. Umetsu K, Takada M, Broadhurst T, Kong X , "The Mass Profile of A1689 from a Lensing Analysis of Deep Subaru Images" , Journal of the Korean Astronomical Society: 38(2), 191-195, 2005-06 [SCI] (Fulltext)
  124. Broadhurst T; Takada M; Umetsu K; et al., "The Surprisingly Steep Mass Profile of A1689, from a Lensing Analysis of Subaru Images" , ASTROPHYSICAL JOURNAL: 619(2), L143-L146, 2005-02 [SCI] (Fulltext)
  125. Kodama T; Tanaka M; ...; Kawasaki W; ...; Umetsu K; et al, "Panoramic views of cluster-scaleassemblies explored by subaru wide-field Imaging" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 57(2), 309-323, 2005 [SCI] (Fulltext)
  126. Umetsu K; Chiueh T; Lin K-Y; Wu J-M; Tseng Y-H, "Simulation of a Combined SZE and Weak Lensing Cluster Survey for AMiBA Experiment" , MODERN PHYSICS LETTERS A: 19(13-16), 1027-1030, 2004-05 [SCI] (Fulltext)
  127. Ho PTP; Chen M-T; ...; Chiueh T; Chu T-H; Jiang H; Koch P; Kubo D; Li C-T; ...; Lin K-Y; Liu G-C; Lo K-Y; Ma C-J; Martin RN; Ng K-W; Nishioka H; Patt F; ...; Wang H; Hwang Y-J; Umetsu K; et al., "The AMiBA Project" , MODERN PHYSICS LETTERS A: 19(13-16), 993-1000, 2004-05 [SCI] (Fulltext)
  128. Park CG; Ng KW; ...; Liu GC; Umetsu K, "Observational Strategies of Cosmic Microwave Background Temperature and Polarization Interferometry Experiments" , ASTROPHYSICAL JOURNAL: 589(1), 67-81, 2003-05 [SCI] (Fulltext)
  129. Sato J; Umetsu K; Futamase T; Yamada T, "The Topology of a Weak Lensing Field in the Neighborhood of MS 1054-03" , ASTROPHYSICAL JOURNAL: 582(2), L67-L70, 2003-01 [SCI] (Fulltext)
  130. Hattori M. and Umetsu K., "Spontaneous Reduction of the Heat Conductivity by a Temperature Gradient-Driven Instability in Electron-Ion Plasmas" , EARTH PLANETS AND SPACE: 53, 689-693, 2001-06 [SCI] (Fulltext)
  131. Umetsu K. and Futamase T., "Detection of Dark Matter Concentrations in the Field of Cl 1604+4304 from Weak Lensing Analysis" , ASTROPHYSICAL JOURNAL: 539(1), L5-L8, 2000-08 [SCI] (Fulltext)
  132. Hattori M. and Umetsu K., "A Possible Route to Spontaneous Reduction of the Heat Conductivity by a Temperature Gradient Driven Instability in Electron-Ion Plasmas" , ASTROPHYSICAL JOURNAL: 533(1), 84-94, 2000-04 [SCI] (Fulltext)
  133. Umetsu K. and Hattori M., "On the Origin of the Metallicity Gradient in Clusters of Galaxies" , ADVANCES IN SPACE RESEARCH: 25, 617-620, 2000-02 [SCI] (Fulltext)
  134. Umetsu K., Tada M., and Futamase T., "Cluster Mass Reconstruction by a Weak Shear Field" , PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT: 133, 53-84, 1999-05 (Fulltext)
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