Academia Sinica Institute of Astronomy & Astrophysics
Go Back
People > Research Fellow > Curriculum Vita
Velocity Field of M87 jet
VSOP image of M87 at 5 GHz
System integration test from receiver to Mark 6 recorder
Distribution of the bulk velocity relative to the speed of light
VLBA total intensity map of the M87 jet at 43 GHz (2-a)
Toward the Innermost Region of the Relativistic Jet from Supermassive Black Hole in the Active Galactic Nuclues M87
ASIAA radiometer in Eureka, Canada
ASIAA Radiometer in Greenland
The Structure of the M87 Jet: A Transition from Parabolic to Conical Streamlines
Asada, Keiichi
Associate Research Fellow (Tenured)
photo of Asada, Keiichi
Office: ASMAB 1217
TEL: +886-2-2366-5410
FAX: +886-2-2367-7849

Education and Positions

  • Associate Research Fellow with Tenure, Institute of Astronomy and Astrophysics, Academia Sinica (2017~present)
  • Assistant Research Fellow, Institute of Astronomy and Astrophysics, Academia Sinica (2012~2017)
  • Postdoctoral Fellow, Institute of Astronomy and Astrophysics, Academia Sinica (2009~2011)
  • Postdoctoral Fellow, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (2007~2009)
  • Postdoctoral Fellow, National Astronomical Observatory of Japan (2004~2007)
  • Graduate University for Advanced Studies Doctor of Science (2001~2004)
  • Department of Physics, Tokyo University of Science, Master in physics (1999~2001)
  • Department of Physics, Tokyo University of Science, BSc in physics (1995~1999)

Research Interests

My current research interests are observational studies of extreme phenomena associated with active galactic nuclei (AGNs), such as ultra-relativistic jet, accretion disk and super massive black hole itself. I have observed AGN jets using radio interferometers, such as VLBA, EVN, VSOP, MERLIN SMA etc to understand acceleration and collimation mechanism of the ultra-relativistic jets. In addition, I have worked on submm VLBI project to realize the imaging of the shadow of the super massive black hole itself together with accretion disk and formation region of the relativistic jet.

Recent Journal Papers

  1. Nagai H; Fujita Y; Nakamura M; ...; Asada K; et al. , "Enhanced Polarized Emission from the One-parsec-scale Hotspot of 3C 84 as a Result of the Interaction with the Clumpy Ambient Medium" , ASTROPHYSICAL JOURNAL: 849(1), 52, 2017-11 [SCI] (Fulltext)
  2. Lico R; Gómez JL; Asada K; et al., "Interpreting the time variable RM observed in the core region of the TeV blazar Mrk 421" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 469(2), 1612-1616, 2017-08 [SCI] (Fulltext)
  3. Hirotani K; Pu H-Y; Lin LC-C; Kong AKH; Matsushita S; Asada K; et al, "Lepton Acceleration in the Vicinity of the Event Horizon: Very High Energy Emissions from Supermassive Black Holes" , ASTROPHYSICAL JOURNAL: 845(1), 77, 2017-08 [SCI] (Fulltext)
  4. Pu H-Y; Wu K; Younsi Z; Asada K; Mizuno Y; Nakamura M, "Observable Emission Features of Black Hole GRMHD Jets on Event Horizon Scales" , ASTROPHYSICAL JOURNAL: 845(2), 160, 2017-08 [SCI] (Fulltext)
  5. Matsushita S; Asada K; Martin-Cocher PL; Chen M-T; Ho PTP; Inoue M; Koch PM; Paine SN; Turner DD, "3.5 Year Monitoring of 225 GHz Opacity at the Summit of Greenland" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC: 129(972), pp. 025001, 2017-02 [SCI] (Fulltext)
  6. Algaba J-C; Nakamura M; Asada, K, "Resolving the Geometry of the Innermost Relativistic Jets in Active Galactic Nuclei"" , ASTROPHYSICAL JOURNAL: 834(1), 65, 2017-01 [SCI] (Fulltext)
  7. Asada, K., Nakamura, M., Pu, H. Y., "Indication of the Black Hole Powered Jet in M87 by VSOP Observations" , ASTROPHYSICAL JOURNAL: Volume 833, Issue 1, article id. 56, 7 pp., 2016-12 [SCI]
  8. Tseng, C. Y., Asada, K., Nakamura, M., Pu, H. Y., Algaba, J. C., Lo, W. P. , "Structural Transition in the NGC 6251 Jet: an Interplay with the Supermassive Black Hole and Its Host Galaxy" , ASTROPHYSICAL JOURNAL: Volume 833, Issue 2, article id. 288, 8 pp., 2016-12 [SCI]
  9. Pu, H. Y., Akiyama, K., Asada, K., "The Effects of Accretion Flow Dynamics on the Black Hole Shadow of Sagittarius A*" , ASTROPHYSICAL JOURNAL: Volume 831, Issue 1, article id. 4, 7 pp., 2016-11 [SCI]
  10. Nagai, H.; Nakanishi, K.; Paladino, R.; Hull, C. L. H.; Cortes, P.; Moellenbrock, G.; Fomalont, E.; Asada K.; Hada, K., "ALMA Science Verification Data: Millimeter Continuum Polarimetry of the Bright Radio Quasar 3C 286" , ASTROPHYSICAL JOURNAL: Volume 824, Issue 2, article id. 132, 10 pp., 2016-06 [SCI]
  11. Algaba J.-C.; Asada K; Nakamura M, "RESOLVING THE ROTATION MEASURE OF THE M87 JET ON KILO-PARSEC SCALES" , ASTROPHYSICAL JOURNAL: Volume 823, Issue 2, article id. 86, 10 pp., 2016-06 [SCI] (Fulltext)
  12. Fish, Vincent L., Johnson, Michael D., Doeleman, Sheperd S. …; Asada K; …; Bower GC; …; Ho PTP; …; Inoue M; et al., "Persistent Asymmetric Structure of Sagittarius A* on Event Horizon Scales" , ASTROPHYSICAL JOURNAL: Volume 820, Issue 2, article id. 90, 11 pp., 2016-04 [SCI]
  13. Hirashita H; Koch PM; Matsushita S; ...; Asada K; et al., "First-Generation Science Cases for Ground-Based Terahertz Telescopes" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 68(1),R1, 2016-02 [SCI] (Fulltext)
  14. Johnson MD; Fish VL; Doeleman SS; …; Asada K; …; Bower GC; …; Ho PTP; …; Inoue M; et al., "Resolved Magnetic-Field Structure and Variability Near the Event Horizon of Sagittarius" , SCIENCE: 350(6265), 1242-1245, 2015-12 [SCI] (Fulltext)
  15. Wagner, J.; Roy, A. L.; Krichbaum, T. P. et al. (includes Asada, K.), " First 230 GHz VLBI fringes on 3C 279 using the APEX Telescope" , ASTRONOMY & ASTROPHYSICS: Volume 581, id.A32, 5 pp., 2015-09 [SCI]
  16. Koyama, S., Kino, M., Doi, A., Niinuma, K., Hada, K., Nagai, H., Honma, M., Akiyama, K., Giroletti, M., Giovannini, G., Orienti, M., Isobe, N., Kataoka, J., Paneque, D., Kobayashi, H., Asada, K., "Probing the Precise Location of Radio Core in TeV Blazar Mrk 501 with VERA at 43 GHz" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: Volume 67, Issue 4, id.6711 pp., 2015-08 [SCI]
  17. Akiyama, K., Lu, R.-S., Fish, V. et al. (includes Asada, K.), "230 GHz VLBI Observations of M87: Event-horizon-scale Structure during an Enhanced Very-high-energy γ-Ray State in 2012" , ASTROPHYSICAL JOURNAL: Volume 807, Issue 2, article id. 150, 11 pp., 2015-07 [SCI]
  18. Hung-Yi Pu, Masanori Nakamura, Kouichi Hirotani, Yosuke Mizuno, Kinwah Wu, and Keiichi Asada, "Steady General Relativistic Magnetohydrodynamic Inflow/Outflow Solution Along Large-Scale Magnetic Fields That Thread A Rotating Black Hole " , ASTROPHYSICAL JOURNAL: Volume 801, Issue 1, article id. 56, 11 pp., 2015-02 [SCI]
  19. Urata, Y., Huang, K., Asada, K., Hirashita, H., Inoue, M., Ho, P. T. P., "A New Era of Submillimeter GRB Afterglow Follow-Ups with the Greenland Telescope" , ADVANCES IN ASTRONOMY: vol. 2015, id. 165030, 2015-01 [SCI]
  20. Inoue M; Algaba-Marcos JC; Asada K; Chang C-C; Chen M-T; Han J; Hirashita H; Ho PTP; Hsieh S-N; Huang T; Jiang H; Koch PM; Kubo DY; Kuo C-Y; Liu B; Martin-Cocher P; Matsushita S; Meyer-Zhao Z; Nakamura M; Nishioka H; Nystrom G; Pradel N; Pu H-Y; Raffin PA; Shen H-Y; Snow W; Srinivasan R; Wei T-S; Blundell R; Burgos R; Grimes P; Keto E; Paine S; Patel N; Sridharan TK; Doeleman SS; Fish V; Brisken W; Napier P, "Greenland Telescope Project: Direct Confirmation of Black Hole with Sub-millimeter VLBI" , RADIO SCIENCE: 49(7), 564-571, 2014-07 [SCI]
  21. Nagai H; ... ; Nakamura M; Asada K; et al., "Limb-brightened Jet of 3C 84 Revealed by the 43 GHz Very-Long-Baseline-Array Observation " , ASTROPHYSICAL JOURNAL: 785(1), 53, 2014-04 [SCI]
  22. Kuo C-Y; Asada K; Rao R; Nakamura M; Algaba JC; Liu HB; Inoue M; Koch PM; Ho PTP; Matsushita S; Pu H-Y; Akiyama K; Nishioka H; Pradel N, "Measuring Mass Accretion Rate onto the Supermassive Black Hole in M87 Using Faraday Rotation Measure with the Submillimeter Array" , Astrophysical Journal Letters: 783(2), L33, 2014-03 [SCI]
  23. Asada, K., Nakamura, M., Doi, A., Nagai, H. & Inoue, M., "Discovery of Sub- to Superluminal Motions in the M87 Jet: An Implication of the Acceleration from Sub-relativistic to Relativistic Speeds" , Astrophysical Journal Letters: Volume 781, Issue 1, article id. L2, 5 pp., 2014-01 [SCI]
  24. Nakamura, M. & Asada, K., "THE PARABOLIC JET STRUCTURE IN M87 AS A MAGNETOHYDRODYNAMIC NOZZLE" , ASTROPHYSICAL JOURNAL: Volume 775, Issue 2, article id. 118, 11 pp., 2013-10 [SCI]
  25. Doi, A. Murata, Y. Mochizuki, N. Takeuchi, H. Asada, K. et al., "Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020+4320: Recently Restarted Jet Activity?" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: Vol.65, No.3, Article No.57, 6, 2013-06 [SCI]
  26. Doi, A., Asada, K., Fujisawa, K., Nagai, H. et al., "Very Long Baseline Array Imaging of Parsec-scale Radio Emissions in Nearby Radio-quiet Narrow-line Seyfert 1 Galaxies" , ASTROPHYSICAL JOURNAL: Volume 765, Issue 1, article id. 69, 10 pp., 2013-03 [SCI]
  27. Doi, A.; Nagira, H.; Kawakatu, N.; Kino, M.; Nagai, H.; Asada, K., "Kiloparsec-scale Radio Structures in Narrow-line Seyfert 1 Galaxies" , ASTROPHYSICAL JOURNAL: Volume 760, Issue 1, article id. 41, 11 pp., 2012-11 [SCI]
  28. Niinuma, K.; Kino, M.; Nagai, H.; Isobe, N.; Gabanyi, K. E.; Hada, K.; Koyama, S.; Asada, K.; Oyama, T.; Fujisawa, K., "Possible Detection of Apparent Superluminal Inward Motion in Markarian 421 after the Giant X-Ray Flare in 2010 February" , ASTROPHYSICAL JOURNAL: Volume 759, Issue 2, article id. 84, 7 pp., 2012-11 [SCI]
  29. Nagai, H., Orienti, M., Kino, M., Suzuki, K., Giovannini, G., Doi, A.,Asada, K., Giroletti, M., Kataoka, J., D'Ammando, F., Inoue, M., Lähteenmäki, A., Tornikoski, M., León-Tavares, J., Kameno, S. & Bach, U., "VLBI and single-dish monitoring of 3C 84 for the period 2009-2011" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: Volume 423, Issue 1, pp. L122-L126, 2012-06 [SCI]
  30. Suzuki, K., Nagai, H., Kino, M., Asada K, Kameno, S., Doi, A., Inoue, M., et al., "Exploring the central sub-pc region of the gamma-ray bright radio galaxy 3C 84 with the VLBA at 43 GHz in the period of 2002-2008" , ASTROPHYSICAL JOURNAL: 746(2), 140, 2012-02 [SCI]
  31. Asada K; Nakamura M, "The Structure of the M87 Jet: A Transition from Parabolic to Conical Streamlines" , Astrophysical Journal Letters: 745(2), L28, 2012-02 [SCI] (Fulltext)
  33. Asada K; Nakamura M; Inoue M; Kameno S; Nagai H;, "MULTI-FREQUENCY POLARIMETRY TOWARD S5 0836+710: A POSSIBLE SPINE-SHEATH STRUCTURE FOR THE JET" , ASTROPHYSICAL JOURNAL: 720(1), 41-45, 2010-09 [SCI] (Fulltext)
  34. Yaji Y; Tashiro MS; Isobe N; Kino M; Asada K; Nagai H; Koyama S; Kusunose M, "EVIDENCE OF NON-THERMAL X-RAY EMISSION FROM RADIO LOBES OF CYGNUS A" , ASTROPHYSICAL JOURNAL: 714(1), 37-44, 2010-05 [SCI] (Fulltext)
  35. Nagai H; Suzuki K; Asada K; Kino M; Kameno S; Doi A; Inoue M; Kataoka J; Bach U; Hirota T; Matsumoto N; Honma M; Kobayashi H; Fujisawa K, "VLBI Monitoring of 3C 84 (NGC 1275) in Early Phase of the 2005 Outburst" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 62(2), L11-L15, 2010-04 [SCI] (Fulltext)
Page Top
TEL: 886-2-3365-2200 FAX: 886-2-2367-7849
General: Media Request:
11F of AS/NTU Astronomy-Mathematics Building, No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C.