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 z̃ 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.
Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey: No Evidence of AGN-driven Quenching / Suh H.; Civano F.; Hasinger G.; Lusso E.; Lanzuisi G.; Marchesi S.; Trakhtenbrot B.; Allevato V.; Cappelluti N.; Capak P.L.; Elvis M.; Griffiths R.E.; Laigle C.; Lira P.; Riguccini L.; Rosario D.J.; Salvato M.; Schawinski K.; Vignali C.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - ELETTRONICO. - 841:(2017), pp. 102-112. [10.3847/1538-4357/aa725c]
Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey: No Evidence of AGN-driven Quenching
Lusso E.;Vignali C.
2017
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 z̃ 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.File | Dimensione | Formato | |
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