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Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey: No Evidence of AGN-driven Quenching

Suh, Hyewon and Civano, Francesca and Hasinger, Günther and Lusso, Elisabeta and Lanzuisi, Giorgio and Marchesi, Stefano and Trakhtenbrot, Benny and Allevato, Viola and Cappelluti, Nico and Capak, Peter L. and Elvis, Martin and Griffiths, Richard E. and Laigle, Clotilde and Lira, Paulina and Riguccini, Laurie and Rosario, David J. and Salvato, Mara and Schawinski, Kevin and Vignali, Cristian (2017) Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey: No Evidence of AGN-driven Quenching. Astrophysical Journal, 841 (2). Art. No. 102. ISSN 1538-4357. doi:10.3847/1538-4357/aa725c.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Suh, Hyewon0000-0002-2536-1633
Civano, Francesca0000-0002-2115-1137
Hasinger, Günther0000-0002-0797-0646
Lusso, Elisabeta0000-0003-0083-1157
Lanzuisi, Giorgio0000-0001-9094-0984
Marchesi, Stefano0000-0001-5544-0749
Trakhtenbrot, Benny0000-0002-3683-7297
Capak, Peter L.0000-0003-3578-6843
Salvato, Mara0000-0001-7116-9303
Schawinski, Kevin0000-0001-5464-0888
Vignali, Cristian0000-0002-8853-9611
Additional Information:© 2017 The American Astronomical Society. Received 2016 December 28; revised 2017 May 1; accepted 2017 May 8; published 2017 May 31. This work was supported in part by NASA Chandra grant number GO3-14150C, GO3-14150B, and also GO5-16150A. K.S. acknowledges support from Swiss National Science Foundation Grants PP00P2_138979 and PP00P2_166159. E.L. is supported by a European Union COFUND/Durham Junior Research Fellowship (under EU grant agreement No. 609412).
Group:COSMOS, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)PP00P2_138979/1
Swiss National Science Foundation (SNSF)PP00P2_166159
European Research Council (ERC)609412
Subject Keywords:black hole physics – galaxies: active – galaxies: nuclei – quasars: general
Issue or Number:2
Record Number:CaltechAUTHORS:20170602-105033523
Persistent URL:
Official Citation:Hyewon Suh et al 2017 ApJ 841 102
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77916
Deposited By: Tony Diaz
Deposited On:02 Jun 2017 18:13
Last Modified:15 Nov 2021 17:35

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