The Cosmic Himalayas: An Extreme Quasar Concentration at Cosmic Noon Bridging AGNs, Galaxies, and Cosmic Web
by
Open Area (4F-SW)
Tsung-Dao Lee Institute
Host: Yizhou Gu
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Abstract：
Well-characterized structures provide a laboratory for studying the growth mechanisms of galaxies and supermassive black holes. The Cosmic Himalayas provides such an anchor: an extreme LSS at z~2.2 hosting 11 luminous Type-1 quasars in a 40 cMpc³ volume. Subaru/HSC NB387 Observations reveal these quasars align perpendicular to a ~100 cMpc Lyman-alpha filament. 3D IGM tomography shows a major ionization gradient along the filament, indicating quasars drive ionizing feedback on tens-of-Mpc scales.Integrating JCMT/SCUBA-2 data, we identify submillimeter galaxies spatially offset from the LAEs, with quasars situated in the intermediate regions. This configuration suggests a clear evolutionary sequence within the LSS, transitioning from dusty starbursts undergoing mergers to the quasar phase and eventually to massive quenched galaxies.
Biography:
Dr. Yongming Liang is an ICRR Fellow at the University of Tokyo, where he researches on the formation and evolution of high-redshift galaxies and the cosmic web. He earned his Ph.D. from the National Astronomical Observatory of Japan (NAOJ) and SOKENDAI in 2022, following a bachelor’s degree from the University of Science and Technology of China (USTC) in 2017. Dr. Liang’s research spans from optical/near-infrared observations with the Subaru and Keck telescopes to forthcoming sub- millimeter and X-ray studies with ALMA and Chandra. With extensive expertise in wide-field observations, particularly with Subaru HSC and PFS, he is a key member of the HSC-SSP, PFS-SSP, MAMMOTH-Subaru, and COSMOS-3D collaborations.
