A Rapidly Accreting Active Galactic Nucleus Hidden in a Dust-obscured Galaxy at z ∼ 0.8

Dust-obscured galaxies (DOGs) containing central supermassive black holes (SMBHs) that are rapidly accreting (i.e., having high Eddington ratios, λEdd) may represent a key phase closest to the peak of both the black hole and galaxy growth in the coevolution framework for SMBHs and galaxies. In this...

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Bibliographic Details
Published in:The Astrophysical journal 2024-12, Vol.977 (1), p.113
Main Authors: Cristello, Nathan, Zou, Fan, Brandt, William N., Yu, Zhibo, Vito, Fabio, Zhu, Shifu
Format: Article
Language:English
Subjects:
Active galactic nuclei
Active galaxies
AGN host galaxies
Black holes
Cosmic dust
Deposition
Dust
Galaxies
Galaxy distribution
Spectral analysis
Spectral energy distribution
Spectrum analysis
Star & galaxy formation
Star formation
Stars & galaxies
Supermassive black holes
X ray spectra
X-ray active galactic nuclei
X-ray astronomy
X-rays
XMM (spacecraft)
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Summary:Dust-obscured galaxies (DOGs) containing central supermassive black holes (SMBHs) that are rapidly accreting (i.e., having high Eddington ratios, λEdd) may represent a key phase closest to the peak of both the black hole and galaxy growth in the coevolution framework for SMBHs and galaxies. In this work, we present a 68 ks XMM-Newton observation of the high-λEdd DOG J1324+4501 at z ∼ 0.8, which was initially observed by Chandra. We analyze the XMM-Newton spectra jointly with archival Chandra spectra. In performing a detailed X-ray spectral analysis, we find that the source is intrinsically X-ray luminous with log(LX/erg s−1)=44.71−0.12+0.08 and heavily obscured with log(NH/cm−2)=23.43−0.13+0.09. We further utilize UV-to-IR archival photometry to measure and fit the source’s spectral energy distribution to estimate its host-galaxy properties. We present a supplementary comparison sample of 21 X-ray luminous DOGs from the XMM-SERVS survey with sufficient (>200) 0.5–10 keV counts to perform a similarly detailed X-ray spectral analysis. Of the X-ray luminous DOGs in our sample, we find that J1324+4501 is the most remarkable, possessing one of the highest X-ray luminosities, column densities, and star formation rates. We demonstrate that J1324+4501 is in an extreme evolutionary stage where SMBH accretion and galaxy growth are at their peaks.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad8c3f