Dr. Zhicheng He (何志成)

Zhicheng He's Astronomy homepage

Updated

3 Feb. 2022

Dr. Zhicheng He is an associate research fellow at Department of Astronomy of University of Science and Technology of China (USTC) since Dec 2018, specializing in Active Galactic Nuclei (driven by Super-Massive Black Holes), Tidal Disruption Events (TDEs) and Cosmic Standard Candle. So far, my main achievement is to establish a set of brand-new methods for measuring the density of ionized gas in active galaxies. As of Feb. 2022, I have 14 first/corresponding author papers. The five representative works are as follows:


1, proposed a novel method to measure the recombination time as well as the density of ionized gas around the Super-Massive Black Holes and measured the distribution of density, distance, energy, and other physical properties of fast outflow gas in a large sample for the first time (published in Nature Astronomy, 3, 265, 2019)


2,  we find the evidence for quasar fast outflows being accelerated at the scale of tens of parsecs, which is far beyond the theoretically predicted location (0.01 to 0.1 parsecs) at which the accretion disk line-driven wind is launched (Science Advances 8, eabk3291, 2022).


3, Based on the SDSS sample, we found the rebound of star formation rate in the evolution of active galaxies for the first time. (Nature Astronomy 6, 339, 2022).


4, one paper found that BAL variabilities in at least 80% of quasars are driven by the variation of an ionizing continuum (published in ApJS, 229, 22 won the Top Cited Paper Award of China ).


5, a ApJL paper found the Hysteresis Effect of Fe II in the TDE, indicating that the iron element released from the sublimated dust that contributes evidently to the observed Fe II emission. 


Others in ApJ, ApJL, MNRAS with about 200 refereed citations in all, and over 10 collaborated papers.

 

CAS Key Laboratory for Research in Galaxies and Cosmology

Department of Astronomy

School of Astronomy and Space Science

University of Science and Technology of China

Hefei 230026, Anhui, China


Here is my CV

 

Email: zcho@ustc.edu.cn

ORCID: 0000-0003-3667-1060

Zhicheng He’s Google Scholar

Copyright is owned by Zhicheng He. All rights are reserved