The Deepest GLIMPSE of a Dense Gas Cocoon Enshrouding a Little Red Dot
Vasily Kokorev, John Chisholm, Rohan P. Naidu, Seiji Fujimoto, Hakim Atek, Gabriel Brammer, Steven L. Finkelstein, Hollis B. Akins, Danielle A. Berg, Lukas J. Furtak, Qinyue Fei, Tiger Yu-Yang Hsiao, Ivo Labb\'e, Jorryt Matthee, Julian B. Mu\~noz, Pascal A. Oesch, Richard Pan

TL;DR
This paper presents detailed JWST observations of a high-redshift Little Red Dot, revealing dense gas and super-Eddington accretion onto a black hole, supported by multiple spectral diagnostics.
Contribution
It provides the first comprehensive spectral analysis confirming dense gas envelopes and super-Eddington accretion in a Little Red Dot at high redshift.
Findings
Detection of Thomson scattering signatures indicating high electron density
Estimation of black hole mass around 5 million solar masses
Evidence of super-Eddington accretion in an early Universe galaxy
Abstract
The detection of strong Balmer breaks and absorption features in Little Red Dots (LRDs) suggests they host AGN embedded within dense gas envelopes, potentially powered by super-Eddington accretion. We present GLIMPSE-17775, a luminous ( erg s) LRD at behind Abell S1063 (), observed with deep JWST/NIRCam and a 20 hr (80 hr de-lensed) NIRSpec/G395M spectrum. The data reveal 40+ emission and absorption features, including a rich forest of low-ionization FeII lines and numerous broad hydrogen recombination transitions. We use this depth to test the dense-gas interpretation through five independent diagnostics. Nearly all permitted lines show exponential wings with consistent FWHM, the signature of Thomson scattering requiring cm. Adopting this width yields , a factor of ten lower…
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Taxonomy
TopicsAstrophysical Phenomena and Observations · Astronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena
