Guochao (Jason) Sun

Office 383, Cahill Center for Astronomy and Astrophysics

1216 E. California Blvd

Pasadena, CA 91106

Hello world! I’m a PhD candidate from the Observational Cosmology group at Caltech. I work with my advisor Jamie Bock and closely collaborate with Tzu-Ching Chang and Steven Furlanetto on a wide range of topics about the cosmological evolution of galaxies and the large-scale structure in the high-redshift universe. I’m a team member of the TIME experiment, which is a new mm-wavelength grating spectrometer array designed to study cosmic reionization and census the molecular gas content during cosmic noon using the line intensity mapping (LIM) technique.

My life so far is about a story of two cities. All the sweet memories in my pre-adult years are about Beijing, the 2nd largest city in China, and I have been bathing in the warm sunshine of Los Angeles, the 2nd largest city in the US, since 2011. Prior to pursuing my PhD at Caltech, I obtained my bachelor degree in astrophysics from UCLA.


Jun 1, 2022 New paper on constraining the star formation law of galaxies with BAO intensity mapping published in ApJ Letters!
Feb 15, 2022 I will become a CIERA Postdoctoral Fellow at Northwestern University in the fall of 2022.
Sep 21, 2021 New paper on imprints of Pop III stars in the near-infrared background published in MNRAS!

selected publications

  1. MNRAS
    Constraints on the star formation efficiency of galaxies during the epoch of reionization
    Sun, G., and Furlanetto, S. R.
    Monthly Notices of the Royal Astronomical Society, 2016
  2. ApJ
    A Foreground Masking Strategy for [C II] Intensity Mapping Experiments Using Galaxies Selected by Stellar Mass and Redshift
    Sun, G., Moncelsi, L., Viero, M. P., Silva, M. B., Bock, J., Bradford, C. M., Chang, T. -C., Cheng, Y. -T., Cooray, A. R., Crites, A., Hailey-Dunsheath, S., Uzgil, B., Hunacek, J. R., and Zemcov, M.
    The Astrophysical Journal, 2018
  3. ApJ
    A Self-consistent Framework for Multiline Modeling in Line Intensity Mapping Experiments
    Sun, Guochao, Hensley, Brandon S., Chang, Tzu-Ching, Doré, Olivier, and Serra, Paolo
    The Astrophysical Journal, 2019
  4. ApJ
    Probing Cosmic Reionization and Molecular Gas Growth with TIME
    Sun, G., Chang, T. -C., Uzgil, B. D., Bock, J. J., Bradford, C. M., Butler, V., Caze-Cortes, T., Cheng, Y. -T., Cooray, A., Crites, A. T., Hailey-Dunsheath, S., Emerson, N., Frez, C., Hoscheit, B. L., Hunacek, J., Keenan, R. P., Li, C. T., Madonia, P., Marrone, D. P., Moncelsi, L., Shiu, C., Trumper, I., Turner, A., Weber, A., Wei, T. S., and Zemcov, M.
    The Astrophysical Journal, 2021