Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey: No Evidence of AGN-driven Quenching
Journal
Date Issued
2017
Author(s)
Suh, Hyewon
•
Civano, Francesca
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Hasinger, Günther
•
•
•
•
Trakhtenbrot, Benny
•
•
CAPPELLUTI, Nico
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Capak, Peter L.
•
Elvis, Martin
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Griffiths, Richard E.
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Laigle, Clotilde
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Lira, Paulina
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Riguccini, Laurie
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Rosario, David J.
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Salvato, Mara
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Schawinski, Kevin
•
Abstract
We investigate the star formation properties of a large sample of ∼2300 X-ray-selected Type 2 Active Galactic Nuclei (AGNs) host galaxies out to z∼ 3 in the Chandra COSMOS Legacy Survey in order to understand the connection between the star formation and nuclear activity. Making use of the existing multi-wavelength photometric data available in the COSMOS field, we perform a multi-component modeling from far-infrared to near-ultraviolet using a nuclear dust torus model, a stellar population model and a starburst model of the spectral energy distributions (SEDs). Through detailed analyses of SEDs, we derive the stellar masses and the star formation rates (SFRs) of Type 2 AGN host galaxies. The stellar mass of our sample is in the range of 9< {log} {M}{stellar}/{M}☉ < 12 with uncertainties of ∼0.19 dex. We find that Type 2 AGN host galaxies have, on average, similar SFRs compared to the normal star-forming galaxies with similar M stellar and redshift ranges, suggesting no significant evidence for enhancement or quenching of star formation. This could be interpreted in a scenario, where the relative massive galaxies have already experienced substantial growth at higher redshift (z> 3), and grow slowly through secular fueling processes hosting moderate-luminosity AGNs.
Volume
841
Issue
2
Start page
102
Issn Identifier
0004-637X
Ads BibCode
2017ApJ...841..102S
Rights
open.access
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