Uncovering a Massive z ∼ 7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web

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Titel: Uncovering a Massive z ∼ 7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web
Beteiligte: Lambrides, Erini; Chiaberge, Marco; Long, Arianna S.; Liu, Daizhong; Akins, Hollis B.; Ptak, Andrew F.; Andika, Irham Taufik; Capetti, Alessandro; Casey, Caitlin M.; Champagne, Jaclyn B.; Chworowsky, Katherine; Clarke, Tracy E.; Cooper, Olivia R.; Ding, Xuheng; Dong, Dillon Z.; Faisst, Andreas L.; Forman, Jordan Y.; Franco, Maximilien; Gillman, Steven; Gozaliasl, Ghassem; Hall, Kirsten R.; Harish, Santosh; Hayward, Christopher C.; Hirschmann, Michaela; [...]
Erschienen: American Astronomical Society, 2024
Erschienen in: The Astrophysical Journal Letters
Sprache: Nicht zu entscheiden
DOI: 10.3847/2041-8213/ad11ee
ISSN: 2041-8205; 2041-8213
Schlagwörter: Space and Planetary Science ; Astronomy and Astrophysics
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Beschreibung: <jats:title>Abstract</jats:title> <jats:p>In this Letter, we report the discovery of the highest redshift, heavily obscured, radio-loud (RL) active galactic nucleus (AGN) candidate selected using JWST NIRCam/MIRI, mid-IR, submillimeter, and radio imaging in the COSMOS-Web field. Using multifrequency radio observations and mid-IR photometry, we identify a powerful, RL, growing supermassive black hole with significant spectral steepening of the radio spectral energy distribution (<jats:italic>f</jats:italic> <jats:sub>1.28 GHz</jats:sub> ∼ 2 mJy, <jats:italic>q</jats:italic> <jats:sub>24 <jats:italic>μ</jats:italic>m</jats:sub> = −1.1, <jats:italic>α</jats:italic> <jats:sub>1.28−3 GHz</jats:sub> = − 1.2, Δ<jats:italic>α</jats:italic> = − 0.4). In conjunction with ALMA, deep ground-based observations, ancillary space-based data, and the unprecedented resolution and sensitivity of JWST, we find no evidence of AGN contribution to the UV/optical/near-infrared (NIR) data and thus infer heavy amounts of obscuration (<jats:italic>N</jats:italic> <jats:sub>H</jats:sub> > 10<jats:sup>23</jats:sup> cm<jats:sup>−2</jats:sup>). Using the wealth of deep UV to submillimeter photometric data, we report a singular solution photo-<jats:italic>z</jats:italic> of <jats:italic>z</jats:italic> <jats:sub>phot</jats:sub> = <jats:inline-formula> <jats:tex-math> <?CDATA ${7.7}_{-0.3}^{+0.4}$?> </jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>7.7</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.3</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.4</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjlad11eeieqn1.gif" xlink:type="simple" /> </jats:inline-formula> and estimate an extremely massive host galaxy <jats:inline-formula> <jats:tex-math> <?CDATA $(\mathrm{log}{M}_{\star }=11.92\pm 0.5{M}_{\odot })$?> </jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo stretchy="false">(</mml:mo> <mml:mi>log</mml:mi> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>⋆</mml:mo> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>11.92</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.5</mml:mn> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>⊙</mml:mo> </mml:mrow> </mml:msub> <mml:mo stretchy="false">)</mml:mo> </mml:math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjlad11eeieqn2.gif" xlink:type="simple" /> </jats:inline-formula> hosting a powerful, growing supermassive black hole (<jats:italic>L</jats:italic> <jats:sub>Bol</jats:sub> = 4−12x × 10<jats:sup>46</jats:sup> erg s<jats:sup>−1</jats:sup>). This source represents the farthest known obscured RL AGN candidate, and its level of obscuration aligns with the most representative but observationally scarce population of AGN at these epochs.</jats:p>
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