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|Title:||SINFONI spectra of heavily obscured AGNs in COSMOS: Evidence of outflows in a MIR/O target at z ~ 2.5||Authors:||Perna, M.
Le Floc'h, E.
|Issue Date:||2015||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||583||First Page:||A72||Abstract:||Aims: We present new data for four candidate obscured Compton-Thick (CT) quasars at z ~ 1-2.5 observed with the SINFONI VLT spectrograph in adaptive optics (AO) mode. These sources were selected from a 24 μm Spitzer MIPS survey of the COSMOS field, on the basis of red mid-infrared to optical and optical to near-infrared colours, with the intention of identifying active galactic nuclei (AGNs) in dust enshrouded environments, where most of the black hole mass is assembled. Methods: Near-infrared spectra were analysed to check for emission line features and to search for broad components in the [OIII]-Hβ and Hα-[NII] regions. We also employed X-ray spectral analysis, radio and MIR diagnostics, and SED fitting to study the nature of the sources. Results: We successfully identified three objects for which we had only a photometric redshift estimate. Based on their emission line diagnostics and on ancillary multi-wavelength constraints, we find that all four targets harbour obscured AGNs. Broad profiles, which could be attributed to the effects of outflows, are revealed in only one target, MIRO20581. In particular, we clearly resolved a fast (~1600 km s<SUP>-1</SUP>) and extended (~5 kpc) outflow in the [OIII]5007 emission line. This feature, the commonly used indicator for ionised outflowing gas, was only sampled and detected for this target; hence, we cannot exclude the presence of outflows in the other sources. Overall, the constraints we obtain from our targets and from other comparative samples from the literature suggest that these optically faint luminous infrared galaxies, hosting obscured AGNs, may represent a brief evolutionary phase between the post-merger starburst and the unobscured quasar phases. Based on observations with SINFONI VLT spectrograph, ESO program 092.A-0884(A).||Acknowledgments:||M.P., M.B., and G.L. acknowledge support from the FP7 Career Integration Grant “eEASy” (“SMBH evolution through cosmic time: from current surveys to eROSITA-Euclid AGN Synergies”, CIG 321913). M.B. gratefully acknowledges fundings from the DFG cluster of excellence “Origin and Structure of the Universe” ( http://www.universe-cluster.de ). We acknowledge financial support from INAF under the contracts PRIN-INAF- 2011 “Black Hole growth and AGN feedback through cosmic time”), from PRIN MIUR 2010-2011 (“The dark Universe and the cosmic evolution of baryons”), and from PRIN-INAF-2014 (“ Windy Black Holes combing galaxy evolution”). We gratefully acknowledge the unique contribution of the entire COSMOS collaboration for making their excellent data products publicly available; more information on the COSMOS survey is available at http://www.astro.caltech.edu/~cosmos . We thank Francesca Civano for sharing COSMOS legacy data before publication and for useful comments. We thank the anonymous referee for his/her interest in the results of our work, and useful suggestions that improved the presentation of the results.||URI:||http://hdl.handle.net/20.500.12386/24132||URL:||https://www.aanda.org/articles/aa/abs/2015/11/aa26907-15/aa26907-15.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201526907||Bibcode ADS:||2015A&A...583A..72P||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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