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
Journal
Date Issued
2018
Author(s)
Lana Ceraj
•
Vernesa Smolčić
•
•
Mladen Novak
•
Giovanni Zamorani
•
Jacinta Delhaize
•
Eva Schinnerer
•
Eleni Vardoulaki
•
Noelia Herrera Ruiz
Abstract
We study a sample of 1,604 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 broad-band spectral energy distribution fitting. We
decompose the total radio 1.4 GHz luminosity ($\mathrm{L_{1.4\ GHz,TOT}}$) into
the emission originating from star formation and AGN activity by measuring the
excess in $\mathrm{L_{1.4\ GHz,TOT}}$ relative to the infrared-radio
correlation of star-forming galaxies. To quantify the excess, for each source
we calculate the AGN fraction ($\mathrm{f_{AGN}}$), the fractional contribution
of AGN activity to $\mathrm{L_{1.4\ GHz,TOT}}$. The majority of the HLAGN,
$(68.0\pm1.5)\%$, are dominated by star-forming processes ($f_{AGN}\leq0.5$),
while $(32.0\pm1.5)\%$ are dominated by AGN-related radio emission
($0.50$).
Volume
620
Start page
A192
Issn Identifier
0004-6361
Ads BibCode
2018A&A...620A.192C
Rights
open.access
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