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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28953
Title: The hidden quasar nucleus of a WISE-selected, hyperluminous, dust-obscured galaxy at z ~ 2.3
Authors: PICONCELLI, Enrico 
Vignali, C.
Bianchi, S.
ZAPPACOSTA, Luca 
Fritz, J.
LANZUISI, Giorgio 
Miniutti, G.
BONGIORNO, ANGELA 
Feruglio, C.
FIORE, Fabrizio 
Maiolino, R.
Issue Date: 2015
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 574
First Page: L9
Abstract: We present the first X-ray spectrum of a hot dust-obscured galaxy (DOG), namely W1835+4355 at z ~ 2.3. Hot DOGs represent a very rare population of hyperluminous (≥10<SUP>47</SUP> erg s<SUP>-1</SUP>), dust-enshrouded objects at z ≥ 2 recently discovered in the WISE All Sky Survey. The 40 ks XMM-Newton spectrum reveals a continuum as flat (Γ ~ 0.8) as typically seen in heavily obscured AGN. This, along with the presence of strong Fe Kα emission, clearly suggests a reflection-dominated spectrum due to Compton-thick absorption. In this scenario, the observed luminosity of L<SUB>2-10</SUB>~ 2 × 10<SUP>44</SUP> erg s<SUP>-1</SUP> is a fraction (<10%) of the intrinsic one, which is estimated to be ≳ 5 × 10<SUP>45</SUP> erg s<SUP>-1</SUP> by using several proxies. The Herschel data allow us to constrain the SED up to the sub-mm band, providing a reliable estimate of the quasar contribution (~75%) to the IR luminosity as well as the amount of star formation (~2100 M<SUB>☉</SUB> yr<SUP>-1</SUP>). Our results thus provide additional pieces of evidence that associate Hot DOGs with an exceptionally dusty phase during which luminous quasars and massive galaxies co-evolve and a very efficient and powerful AGN-driven feedback mechanism is predicted by models.
Acknowledgments: We thank the anonymous referee for helpful comments. E.P. and A.B. acknowledge financial support from INAF under the contract PRIN-INAF-2012.
URI: http://hdl.handle.net/20.500.12386/28953
URL: https://www.aanda.org/articles/aa/abs/2015/02/aa25324-14/aa25324-14.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201425324
Bibcode ADS: 2015A&A...574L...9P
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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