Abstract
Abstract
Optically quiescent quasars (OQQs) represent a recently systematized class of infrared-luminous active galactic nuclei (AGNs) that have galaxy-like optical continua. They may represent an interesting, brief phase in the AGN life cycle, e.g., either cocooned within high-covering-factor media or indicative of recent triggering, though their nature remains unclear. Here, we present the first targeted simultaneous X-ray observations of an OQQ, our previously identified prototype, SDSS J075139.06+402811.2 at z = 0.587. The source is significantly detected over 0.5–16 keV with XMM-Newton and NuSTAR, unambiguously confirming the presence of current accretion activity. Spectral modeling yields an intrinsic luminosity L
2–10 keV ≈ 4.4 × 1043 erg s−1, well within the AGN regime, but underluminous relative to its infrared power. It is lightly obscured, with log N
H [cm−2] ≈ 22.
Funder
UKRI ∣ Science and Technology Facilities Council
University of Southampton
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
1 articles.
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1. A population of Optically Quiescent Quasars from WISE and SDSS;Monthly Notices of the Royal Astronomical Society;2023-12-23