The hyperluminous Compton-Thick z ∼ 2 quasar nucleus of the hot DOG W1835+4355 observed by NuSTAR
Authors
Zappacosta, L
Piconcelli, E
Duras, F
Vignali, C
Valiante, R
Bianchi, S
Bongiorno, A
Fiore, F
Feruglio, C
Lanzuisi, G
Maiolino, R
Mathur, S
Miniutti, G
Ricci, C
Publication Date
2018Journal Title
Astronomy and Astrophysics
ISSN
0004-6361
Publisher
EDP Sciences
Volume
618
Type
Article
Metadata
Show full item recordCitation
Zappacosta, L., Piconcelli, E., Duras, F., Vignali, C., Valiante, R., Bianchi, S., Bongiorno, A., et al. (2018). The hyperluminous Compton-Thick z ∼ 2 quasar nucleus of the hot DOG W1835+4355 observed by NuSTAR. Astronomy and Astrophysics, 618 https://doi.org/10.1051/0004-6361/201732557
Abstract
We present a 155ks NuSTAR observation of the $z\sim2$ hot dust-obscured
galaxy (hot DOG) W1835+4355. We extracted spectra from the two NuSTAR detectors
and analyzed them jointly with the archival XMM PN and MOS spectra. We
performed a spectroscopic analysis based on both phenomenological and
physically motivated models employing toroidal and spherical geometry for the
obscurer. In all the modelings, the source exhibits a Compton-thick column
density $N_{\rm H} \gtrsim 10^{24}$ cm$^{-2}$, a 2-10 keV luminosity
$L_{2-10}\approx2\times10^{45}$ erg s$^{-1}$ , and a prominent soft excess
($\sim5-10$ % of the primary radiative output), which translates into a
luminosity $\sim10^{44}$ erg s$^{-1}$. We modeled the spectral energy
distribution from 1.6 to 850 $\mu m$ using a clumpy two-phase dusty torus model
plus a modified blackbody to account for emission powered by star formation in
the far-infrared. We employed several geometrical configurations consistent
with those applied in the X-ray analysis. In all cases we obtained a bolometric
luminosity $L_{\rm bol}\approx3-5\times10^{47}$ erg s$^{-1}$, which confirms
the hyperluminous nature of this active galactic nucleus. Finally, we estimate
a prodigious star formation rate of $\sim$3000 $M_{\odot}\,yr^{-1}$, which is
consistent with the rates inferred for $z\approx2-4$ hyperluminous type I
quasars. The heavily obscured nature, together with $L_{\rm bol}$, the ratio of
X-ray to mid-infrared luminosity, the rest-frame optical morphology, and the
host star formation rate are indicative of its evolutionary stage. We can
interpret this as a late-stage merger event in the transitional,
dust-enshrouded, evolutionary phase eventually leading to an optically bright
AGN.
Sponsorship
ERC
STFC
Funder references
Science and Technology Facilities Council (ST/M001172/1)
European Research Council (695671)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1051/0004-6361/201732557
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283045
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