Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/24487
Titolo: | AGN host galaxy mass function in COSMOS. Is AGN feedback responsible for the mass-quenching of galaxies? | Autori: | BONGIORNO, ANGELA Schulze, A. Merloni, A. Zamorani, G. Ilbert, O. La Franca, F. Peng, Y. Piconcelli, E. Mainieri, V. Silverman, J. D. Brusa, M. FIORE, Fabrizio Salvato, M. Scoville, N. |
Data pubblicazione: | 2016 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 588 | Da pagina:: | 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 |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
1601.02091.pdf | postprint | 1.07 MB | Adobe PDF | Visualizza/apri |
aa27436-15.pdf | pdf editoriale | 1.51 MB | Adobe PDF | Visualizza/apri |
Page view(s)
70
controllato il 5-ago-2024
Download(s)
27
controllato il 5-ago-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.