Title: The Interstellar Medium and Star Formation Properties of Low Redshift Quasars

Speaker: 谢艳霞

Institute: 北京大学 科维理天文与天体物理研究所

Host: 于浩然

Time: 10:00-12:00, Wednesday, June 30

Location: Physics Building 552

Abstract:

Supermassive black holes (BHs) are widely regarded as closely connected with galaxies' evolution. Still, the exact manner in which active galactic nuclei (AGNs) truly impact their host galaxies remains a topic of lively debate. Measurement of the star formation rate and interstellar medium content in AGN provides valuable insight into this aspect. Employing star formation rate (SFR) calibrations based on mid-infrared PAH, neon line emissions, and total IR luminosity, I will show which tracer best quantifies the SFRs for the hosts of the low-redshift quasars. In combination with the gas content estimated from dust, their star formation efficiencies are also evaluated. I will discuss the final result in the context of AGN feedback. In my presentation, I will also talk about the dust extinctions in the AGN torus studied through theoretical dust modeling.

Bio:

Yanxia Xie has been a postdoc at the KIAA-PKU since she got her Ph.D. from Shanghai Astronomical Observatory in 2016. Before that, She spent two years at the University of Missouri as a visiting student. Yanxia Xie obtained her bachelor's degree from Tianjin Normal University. Her current research interests focus on AGN feedback, the interstellar medium of galaxies, and theoretical dust modeling.