ABSTRACT: X-ray surveys have been an effective way to study growing
supermassive black holes (SMBHs). Utilizing X-ray survey fields that
have extensive multiwavelength data coverage, we can probe how SMBH
growth links with the properties of their host galaxies, which will
ultimately help to investigate the physical mechanisms behind the
potential coevolution of SMBHs and their hosts. In my talk, I will
present the relation between SMBH growth and host-galaxy compactness
(represented by the central surface-mass density) we found among
star-forming galaxies, which is more significant than the relation
between SMBH growth and stellar mass or star formation rate. I will also
present how the growth of SMBHs varies with Dn4000 (which is closely
related to the age of stellar populations) measured from spectra of
their hosts. We found that when controlling for various other
host-galaxy properties, AGN fraction and SMBH growth level are higher
among younger galaxies at Dn4000 < 1.9, consistent with the expectation
from the stellar mass loss fueling scenario. Among the oldest/most
massive galaxies at low redshift, this trend is not present, which may
be associated with additional fueling from hot halo gas and/or enhanced
accretion capability.

BIO: Dr. Qingling Ni is currently a postdoctoral researcher at MPE.
Her research focuses on the coevolution of supermassive black holes and
their host galaxies, multiwavelength studies of AGNs, and X-ray
astronomy. She obtained her Ph.D. degree in Astronomy and Astrophysics
from Penn State in 2021, and BA from Fudan University in 2016.