Bojun Zhang

Bojun Zhang

A student in USTC, majoring in astronomy

Research

Position of radio AGNs relative to the star-forming main sequence

Co-evolution of black holes and their host galaxies is an fundamental question. One of the ways to investigate this question is to look at the star formation rates of AGNs rel- ative to normal star forming galaxies. To look at this issue, I analyzed galaxy and AGN data from three deep-drilling fields to determine the star-forming main sequence. My results show host galaxies of radio AGNs lie below the main sequence at low redshifts, and lie on or above the main sequence at higher redshifts.

The scaling relations between the mass of supermassive black holes and properties of the host galaxies at high redshifts

Supermassive black holes and their host galaxies have highly correlated properties, which indicates possible co-evolution between them. These correlations have been better measured in low-redshift galaxies. However, in high-redshift galaxies, there are difficulties regarding mass measurement of black holes and decomposition of galaxy structures. To address this problem, we study hot-DOGs (hot dust-obscured galaxies). Cores of these galaxies are easier to be told from other parts. Ultimately, this study aims to improve the correlation between black holes and bulges.