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

Hyewon Suh, Francesca Civano, Günther Hasinger, Elisabeta Lusso, 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

Research output: Contribution to journalArticlepeer-review


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 1 M M stellar 2 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 Mstellar 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.

Original languageEnglish
Article number102
JournalAstrophysical Journal
Issue number2
StatePublished - 1 Jun 2017
Externally publishedYes


FundersFunder number
Seventh Framework Programme609412


    • black hole physics
    • galaxies: active
    • galaxies: nuclei
    • quasars: general


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