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

Suh, Hyewon; Civano, Francesca; Hasinger, Günther; Lusso, Elisabeta; Lanzuisi, Giorgio; Marchesi, Stefano; Trakhtenbrot, Benny; Allevato, Viola; Cappelluti, Nico; Capak, Peter L.; Elvis, Martin; Griffiths, Richard E.; Laigle, Clotilde; Lira, Paulina; Riguccini, Laurie; Rosario, David J.; Salvato, Mara; Schawinski, Kevin; Vignali, Cristian

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


Authors

Hyewon Suh

Francesca Civano

Günther Hasinger

Giorgio Lanzuisi

Stefano Marchesi

Benny Trakhtenbrot

Viola Allevato

Nico Cappelluti

Peter L. Capak

Martin Elvis

Richard E. Griffiths

Clotilde Laigle

Paulina Lira

Laurie Riguccini

David J. Rosario

Mara Salvato

Kevin Schawinski

Cristian Vignali



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 $z\sim 3$ 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 $9\lt \mathrm{log}\,{M}_{\mathrm{stellar}}/{M}_{\odot }\lt 12$ 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 ($z\gt 3$), and grow slowly through secular fueling processes hosting moderate-luminosity AGNs.

Citation

Suh, H., Civano, F., Hasinger, G., Lusso, E., Lanzuisi, G., Marchesi, S., …Vignali, C. (2017). Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey: No Evidence of AGN-driven Quenching. Astrophysical Journal, 841(2), Article 102. https://doi.org/10.3847/1538-4357/aa725c

Journal Article Type Article
Acceptance Date May 8, 2017
Online Publication Date May 31, 2017
Publication Date May 31, 2017
Deposit Date Jul 5, 2017
Publicly Available Date Jul 5, 2017
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 841
Issue 2
Article Number 102
DOI https://doi.org/10.3847/1538-4357/aa725c

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Copyright Statement
© 2017. The American Astronomical Society. All rights reserved.





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