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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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Piconcelli_1412.3595.pdf | postprint | 118.67 kB | Adobe PDF | View/Open |
Piconcelli_aa25324-14.pdf | Pdf editoriale | 175.34 kB | Adobe PDF | View/Open |
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