Title：Investigating the link between the growth of SMBHs and their host galaxies with X-ray surveys

Speaker：Qingling Ni (MPE)

Location：Small conference room, 3rd floor

Time：10:30 am August 22th (Tuesday)

Tencent Meeting：576-157-8290 Password: 6360

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.

CV：

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.