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|Title:||AGN host galaxy mass function in COSMOS. Is AGN feedback responsible for the mass-quenching of galaxies?||Authors:||BONGIORNO, ANGELA
La Franca, F.
Silverman, J. D.
|Issue Date:||2016||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||588||First Page:||A78||Abstract:||We investigate the role of supermassive black holes in the global context of galaxy evolution by measuring the host galaxy stellar mass function (HGMF) and the specific accretion rate, that is, λ<SUB>SAR</SUB>, the distribution function (SARDF), up to z ~ 2.5 with ~1000 X-ray selected AGN from XMM-COSMOS. Using a maximum likelihood approach, we jointly fit the stellar mass function and specific accretion rate distribution function, with the X-ray luminosity function as an additional constraint. Our best-fit model characterizes the SARDF as a double power-law with mass-dependent but redshift-independent break, whose low λ<SUB>SAR</SUB> slope flattens with increasing redshift while the normalization increases. This implies that for a given stellar mass, higher λ<SUB>SAR</SUB> objects have a peak in their space density at earlier epoch than the lower λ<SUB>SAR</SUB> objects, following and mimicking the well-known AGN cosmic downsizing as observed in the AGN luminosity function. The mass function of active galaxies is described by a Schechter function with an almost constant M<SUP>∗</SUP><SUB>⋆</SUB> and a low-mass slope α that flattens with redshift. Compared to the stellar mass function, we find that the HGMF has a similar shape and that up to log (M<SUB>⋆</SUB>/M<SUB>☉</SUB>) ~ 11.5, the ratio of AGN host galaxies to star-forming galaxies is basically constant (~10%). Finally, the comparison of the AGN HGMF for different luminosity and specific accretion rate subclasses with a previously published phenomenological model prediction for the "transient" population, which are galaxies in the process of being mass-quenched, reveals that low-luminosity AGN do not appear to be able to contribute significantly to the quenching and that at least at high masses, that is, M<SUB>⋆</SUB> > 10<SUP>10.7</SUP> M<SUB>☉</SUB>, feedback from luminous AGN (log L<SUB>bol</SUB> ≳ 46 [erg/s]) may be responsible for the quenching of star formation in the host galaxy.||URI:||http://hdl.handle.net/20.500.12386/24487||URL:||https://www.aanda.org/articles/aa/abs/2016/04/aa27436-15/aa27436-15.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201527436||Bibcode ADS:||2016A&A...588A..78B||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Sep 25, 2020
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