Fading Light, Fierce Winds: JWST Snapshot of a Sub-Eddington Quasar at Cosmic Dawn
Jianwei Lyu, George H. Rieke, Meredith Stone, Jane Morrison, Stacey, Alberts, Xiangyu Jin, Yongda Zhu, Weizhe Liu, Jinyi Yang

TL;DR
This study uses JWST observations to analyze a low-luminosity, sub-Eddington quasar at cosmic dawn, revealing its evolved state, high-velocity winds, and feedback effects on its environment, offering insights into early SMBH growth.
Contribution
First detailed JWST/NIRSpec analysis of a sub-Eddington quasar at z~6.25, revealing its evolved state, winds, and feedback in the early Universe.
Findings
SMBH mass ~3x10^8 solar masses
Sub-Eddington accretion at λ_Edd~0.4
Detection of high-velocity winds (~10^4 km/s) and outflowing gas
Abstract
The majority of most luminous quasars during the epoch of reionization accrete near or above the Eddington limit, marking the vigorous growth of primitive supermassive black holes (SMBHs). However, their subsequent evolution and environmental impact remain poorly characterized. We present JWST/NIRSpec prism IFU observations of HSC J2239+0207, a low-luminosity quasar at likely in a late stage of mass assembly with an overmassive SMBH relative to its host galaxy. Using H and H broad emission lines, we estimate an SMBH mass and confirm its sub-Eddington accretion at . Strong FeII emission and a proximity zone of typical size suggest a metal-rich, highly evolved system. In the far-UV, this quasar presents strong broad-absorption-line features, indicative of high-velocity winds ($\nu\sim10^4~{\rm…
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Taxonomy
TopicsCosmology and Gravitation Theories · Astronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena
