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21cm brightness fluctuation at z=0.8 in cross-correlation
An intensity map of hydrogen 21-cm emission at redshift z ≈ 0.8
The GMRT Epoch of Reionization experiment: a new upper limit on the neutral hydrogen power spectrum at z ≈ 8.6
Chang, Tzu-Ching
Visiting Scholar
photo of Chang, Tzu-Ching
Email: tcchang_replace2@_asiaa.sinica.edu.tw

Education and Positions

  • Assistant Research Fellow, ASIAA (2010~present)
  • CITA-ASIAA Postdoctoral Fellow, Canadian Institute for Theoretical Astrophysics and ASIAA (2006~2010)
  • TAC Fellow, UC Berkeley (2003~2006)
  • Ph.D, Astrophysics, Columbia University (2003)
  • B.S., Physics, National Taiwan University (1997)

Honors & Awards

  • TWAS Young Affiliate (2012~2016)
  • Academia Sinica Distinguished Postdoctoral Fellowship (2007~2009)
  • TAC Fellowship, UC Berkeley (2003)

Research Interests

21-cm Cosmology; Cosmic Reionization; Gravitational Lensing; Large-scale Structure

Recent Journal Papers

  1. Liao Y-W; Chang T-C; Kuo C-Y; et al., "Accurate Polarization Calibration at 800 MHz with the Green Bank Telescope" , ASTROPHYSICAL JOURNAL: 833(2), 289, 2016-12 [SCI] (Fulltext)
  2. Cheng Y-T; Chang T-C; Bock J; et al., "Spectral Line De-confusion in an Intensity Mapping Survey" , ASTROPHYSICAL JOURNAL: 832(2), 165, 2016-12 [SCI] (Fulltext)
  3. Venumadhav T; [Chang T-C]; Doré O; Hirata CM, "A Practical Theorem on Using Interferometry to Measure the Global 21-cm Signal" , ASTROPHYSICAL JOURNAL: 826(2), 116, 2016-08 [SCI] (Fulltext)
  4. Hunacek J; Bock J; Bradford CM; ...; Chang TC; Cheng, YT; ...; Koch P; Li CT; et al., "Design and Fabrication of TES Detector Modules for the TIME-Pilot [CII] Intensity Mapping Experiment" , JOURNAL OF LOW TEMPERATURE PHYSICS: 184(3-4), 733-738, 2016-08 [SCI]
  5. Cohn JD; White M; Chang T-C; et al., "Combining galaxy and 21-cm surveys" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 457(2), 2068-2077, 2016-04 [SCI] (Fulltext)
  6. Masui K; Lin HH; Sievers J; Anderson CJ; Chang TC; Chen XL;Ganguly A; Jarvis M; Kuo CY; Li YC; Liao YW; et al., "Dense magnetized plasma associated with a fast radio burst" , NATURE: 528(7583): 523–525, 2015-12 [SCI] (Fulltext)
  7. Keating GK; Bower GC; Marrone DP; ...; Chang T-C; et al., "First Results from COPSS: The CO Power Spectrum Survey" , ASTROPHYSICAL JOURNAL: 814(2), 140, 2015-12 [SCI]
  8. Switzer ER; Chang T-C; Masui KW; Pen U-L; Voytek TC, "Interpreting the Unresolved Intensity of Cosmologically Redshifted Line Radiation" , ASTROPHYSICAL JOURNAL: 815(1), 51, 2015-12 [SCI]
  9. Rhodes J; Allen S; Benson BA; Chang T; et al., "Exploiting cross correlations and joint analyses" , ASTROPARTICLE PHYSICS: 63, 42-54, 2015-03 [SCI] (Fulltext)
  10. Paciga G; Albert JG; Bandura K; Chang T-C; et al., "A simulation-calibrated limit on the H I power spectrum from the GMRT Epoch of Reionization experiment" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 433(1), 639-647, 2013-07 [SCI]
  11. Switzer ER; Masui KW; Bandura K; ...; Chang T-C; ...; Liao Y-W; et al.,, "Determination of z ˜ 0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping autocorrelation" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 434(1), L46-L50, 2013-07 [SCI]
  12. Anthony Pullen, (Tzu-Ching Chang), Olivier Dore, Adam Lidz, "Cross-correlations as a carbon monoxide detector" , ASTROPHYSICAL JOURNAL: 768(1), 15, 2013-05 [SCI] (Fulltext)
  13. J. C. Pober, A. R. Parsons, D. R. DeBoer, P. McDonald, M. McQuinn, J. E. Aguirre, Z. Ali, R. F. Bradley, (T.-C. Chang), M. F. Morales, "The Baryon Acoustic Oscillation Broadband and Broad-beam Array: Design Overview and Sensitivity Forecasts" , ASTRONOMICAL JOURNAL: 145 (3), 65, 2013-03 [SCI] (Fulltext)
  14. K. W. Masui, E. R. Switzer, N. Banavar, K. C. Bandura, Blake, L. M. Calin, (T.-C. Chang), X. Chen, Y.-C. Li, Y.-W. Liao, "Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation" , Astrophysical Journal Letters: 763(1), L20, 2013-01 [SCI] (Fulltext)
  15. Elisabeth Krause, (Tzu-Ching Chang), Olivier Doré, Keiichi Umetsu, "The Weight of Emptiness: The Gravitational Lensing Signal of Stacked Voids" , Astrophysical Journal Letters: 762(2), L20, 2013-01 [SCI]
  16. Lidz A; Furlanetto SR; Oh SP; Aguirre J; Chang T-C;et al. , "Intensity Mapping with Carbon Monoxide Emission Lines and the Redshifted 21 cm Line" , ASTROPHYSICAL JOURNAL: 741(2), 70, 2011-11 [SCI] (Fulltext)
  17. Paciga G; Chang T-C; Gupta Y; et al. , "The GMRT Epoch of Reionization experiment: a new upper limit on the neutral hydrogen power spectrum at z≈ 8.6" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 413(2), 1174-1183, 2011-05 [SCI] (Fulltext)
  18. Alvarez MA; Pen UL; Chang T-C, "Enhanced Detectability of Pre-reionization 21-cm Structure" , ASTROPHYSICAL JOURNAL: 723(1), L17-L21, 2010-11 [SCI] (Fulltext)
  19. Chang TC; Pen UL; Bandura K; Peterson JB, "An intensity map of hydrogen 21-cm emission at redshift" , NATURE: 466(7305), 463-465, 2010-07 [SCI] (Fulltext)
  20. Pen UL; Chang TC; Hirata CM; et al., "The GMRT EoR experiment: limits on polarized sky brightness at 150 MHz" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 399(1), 181-194, 2009-10 [SCI] (Fulltext)
  21. Pen U-L; Staveley-Smith L; Peterson J; Chang T-C, "First Detection of Cosmic Structure in the 21-cm Intensity Field" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 394(1), L6-L10, 2009-03 [SCI] (Fulltext)
  22. Chang T-C; Pen U-L; Peterson JB; McDonald P, "Baryon Oscillation Intensity Mapping of Dark Energy" , PHYSICAL REVIEW LETTERS: 100(9), Art. No. 091303, 2008-03 [SCI] (Fulltext)
  23. Cohn JD; Chang T-C, "Source mergers and bubble growth during reionization" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 374(1), 72-94, 2007-01 [SCI] (Fulltext)
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