XMM-Newton and NuSTAR Observations of an Optically Quiescent Quasar. (arXiv:2208.01627v1 [astro-ph.HE])

XMM-Newton and NuSTAR Observations of an Optically Quiescent Quasar. (arXiv:2208.01627v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Greenwell_C/0/1/0/all/0/1">Claire Greenwell</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gandhi_P/0/1/0/all/0/1">Poshak Gandhi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lansbury_G/0/1/0/all/0/1">George Lansbury</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boorman_P/0/1/0/all/0/1">Peter Boorman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mainieri_V/0/1/0/all/0/1">Vincenzo Mainieri</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stern_D/0/1/0/all/0/1">Daniel Stern</a>

Optically quiescent quasars (OQQs) represent a recently systematised class of
infrared-luminous active galactic nuclei (AGN) which 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 modelling yields an
intrinsic luminosity $L_{rm 2-10 keV}$ $approx$4.4$ times$10$^{43}$ erg
s$^{-1}$, well within the AGN regime, but underluminous relative to its
infrared power. It is lightly obscured, with log $N_{rm H}$ [cm$^{-2}$]
$approx$22.

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