简介: |
We study the relationship between X-ray luminosity and the star formation rate (SFR) for a sample of dusty active galactic nuclei (AGNs) at 0.04 < z < 3.3. Our sample consists of dusty AGNs detected in both X-ray and far-Infrared by XMM and Herschel in the XMM-LSS field. All of the selected targets have spectroscopic redshifts and broad band photometry that allows black hole mass and spectral energy distribution (SED) analysis. We compare their X-ray and AGN-removed infrared luminosities, and study the dependence of the observed relation on luminosity, obscuration, supermassive black hole mass, Eddington ratio, and the fraction of AGN contribution to infrared luminosity. We find a positive correlation between L_X and SFR up to z=3. This is consistent with the secular evolution scenario, in which the nucleus and galaxy are fueled by the same gas supply at a relatively constant ratio. We also investigate the effect of binning choices on the observed trend. Comparing our results to those in the literature, we propose a unified physical scenario that explains the observed L_X-SFR connection once sample selection bias is accounted for.
Bio: Yu Sophia Dai is a Postdoctoral Fellow at California Institute of Technology-IPAC. She received her PhD in astrophysics in 2014, working on the observational study of dusty quasars, under the supervision of Dr. Giovanni Fazio from Harvard-Smithsonian Center for Astrophysics (CfA). Before moving to Cambridge, Massachusettes, she obtained her M.S degree in Physics from Boston College (2009), and a B.S. degree in physics from Beijing University (2007). Her research interests are the formation and evolution of galaxies, with a focus on active galactic nuclei (AGN) and the AGN - host connection from a multi-wavelength perspective, from X-ray, UV-optical, to infrared and (sub)millimeter observations. She is also an expert in the HST grism spectroscopic analysis. |
