Fri, Dec 13 2024, 4pm
Jiangwan S140
Astro Seminar: Dust-Obscured Galaxies in the XMM-SERVS Fields: Selection, Multiwavelength Characterization, and Physical Nature
Abstract: Dust-obscured galaxies (DOGs) are unique objects for studying galaxy-SMBH coevolution. We select 3738 DOGs at z ≈ 1.6–2.1 from the 13 deg² XMM-SERVS fields, leveraging the superb multiwavelength data from X-rays to radio. This is the largest DOG sample with comprehensive source characterization. Spectral energy distribution (SED) modeling shows that DOGs comprise both normal galaxies and active galactic nuclei (AGNs). Our DOGs are massive, 174 are detected in X-rays, and they are generally radio-quiet systems. We find that DOGs exhibit similar AGN fractions to typical galaxy population. X-ray detected DOGs, though more massive and obscured in X-rays, are not more star-forming compared to matched typical X-ray AGNs, which potentially challenges the relevance of merger-driven galaxy-SMBH coevolution framework for X-ray detected DOGs.
Bio: Zhibo Yu (喻知博) is a third-year PhD student at The Pennsylvania State University, where he works with Prof. Niel Brandt on AGN surveys. His current research focuses on the coevolution of supermassive black holes and their host galaxies, multiwavelength studies of AGNs, and X-ray astronomy. He obtained a Bachelor’s degree in Physics from Fudan University in 2022.
