Pregled bibliografske jedinice broj: 974103
The VLA-COSMOS 3 GHz Large Project: Star formation properties and radio luminosity functions of AGN with moderate-to-high radiative luminosities out to z∼6
The VLA-COSMOS 3 GHz Large Project: Star formation properties and radio luminosity functions of AGN with moderate-to-high radiative luminosities out to z∼6 // Astronomy & astrophysics (Berlin), 620 (2018), A192; A192, 19 doi:10.1051/0004-6361/201833935 (međunarodna recenzija, članak, znanstveni)
CROSBI ID: 974103 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
The VLA-COSMOS 3 GHz Large Project: Star formation properties and radio luminosity functions of AGN with moderate-to-high radiative luminosities out to z∼6
Autori
Ceraj, Lana ; Smolčić, Vernesa ; Delvecchio, Ivan ; Novak, Mladen ; Zamorani, Giovanni ; Delhaize, Jacinta ; Schinnerer, Eva ; Vardoulaki, Eleni ; Herrera Ruiz, Noelia
Izvornik
Astronomy & astrophysics (Berlin) (0004-6361) 620
(2018), A192;
A192, 19
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
galaxies: active – galaxies: evolution – galaxies: high-redshift – galaxies: star formation
Sažetak
We have studied a sample of 1604 moderate-to-high radiative luminosity active galactic nuclei (HLAGN) selected at 3 GHz within the VLA-COSMOS 3 GHz Large Project. These were classified by combining multiple AGN diagnostics: X-ray data, mid-infrared data and broadband spectral energy distribution fitting. We decomposed the total radio 1.4 GHz luminosity (L_1.4GHz, TOT) into the emission originating from star formation and AGN activity by measuring the excess in L_1.4GHz, TOT relative to the infrared-radio correlation of star-forming galaxies. To quantify the excess, for each source we calculated the AGN fraction (f_AGN) defined as the fractional contribution of AGN activity to L_1.4GHz, TOT. The majority of the HLAGN, (68.0+-1.5)%, are dominated by star-forming processes(f_AGN<=0.5), while (32.0+-1.5)% are dominated by AGN-related radio emission (0.5 < f_AGN <=1).We used the AGN-related 1.4 GHz emission to derive the 1.4 GHz AGN luminosity functions of HLAGN. By assuming pure density and pure luminosity evolution models we constrained their cosmic evolution out to z~6, finding Phi(z)* ~(1+z)^((2.64+-0.10)+(-0.61+-0.04)z) and L*(z)~(1+z)^((3.97+-0.15)+(-0.92+-0.06)z).These evolutionary laws show that the number and luminosity density of HLAGN increased from higher redshifts (z~6) up to a maximum in the redshift range 1 < z < 2.5, followed by a decline toward local values. By scaling the 1.4 GHz AGN luminosity to kinetic luminosity using the standard conversion, we estimate the kinetic luminosity density as a function of redshift. We compare our result to the semi-analytic models of radio mode feedback, and find that this feedback could have played an important role in the context of AGN-host co-evolution in HLAGN which shows evidence of AGN-related radio emission (f_AGN > 0).
Izvorni jezik
Engleski
Znanstvena područja
Fizika
POVEZANOST RADA
Projekti:
EK-FP7-337595 - Constraining Stellar Mass and Supermassive Black Hole Growth through Cosmic Times: Paving the way for the next generation sky surveys Opis projekta (COSMASS) (Smolčić, Vernesa, EK - ERC-2013-StG) ( CroRIS)
Ustanove:
Prirodoslovno-matematički fakultet, Zagreb
