The XXL Survey: XLI. Radio AGN luminosity functions based on the GMRT 610 MHz continuum observations
Review article, 2020
We study the space density evolution of active galactic nuclei (AGN) using the 610 MHz radio survey of the XXL-North field, performed with the Giant Metrewave Radio Telescope. The survey covers an area of 30.4 deg(2), with a beamsize of 6.5 arcsec. The survey is divided into two parts, one covering an area of 11.9 deg(2) with 1 sigma rms noise of 200 mu Jy beam(-1) and the other spanning 18.5 deg(2) with rms noise of 45 mu Jy beam(-1). We extracted the catalog of radio components above 7 sigma. The catalog was cross-matched with a multi-wavelength catalog of the XXL-North field (covering about 80% of the radio XXL-North field) using a likelihood ratio method, which determines the counterparts based on their positions and their optical properties. The multi-component sources were matched visually with the aid of a computer code: Multi-Catalog Visual Cross-Matching. A flux density cut above 1 mJy selects AGN hosts with a high purity in terms of star formation contamination based on the available source counts. After cross-matching and elimination of observational biases arising from survey incompletenesses, the number of remaining sources was 1150. We constructed the rest-frame 1.4 GHz radio luminosity functions of these sources using the maximum volume method. This survey allows us to probe luminosities of 23 less than or similar to log(L-1.4 GHz[W Hz(-1)])less than or similar to 28 up to redshifts of z approximate to 2.1. Our results are consistent with the results from the literature in which AGN are comprised of two differently evolving populations, where the high luminosity end of the luminosity functions evolves more strongly than the low-luminosity end.
radio continuum: galaxies
accretion
galaxies: nuclei
accretion disks
galaxies: active
galaxies: evolution
Author
B. Slaus
University of Zagreb
V Smolcic
University of Zagreb
M. Novak
Max Planck Society
S. Fotopoulou
University of Geneva
Durham University
P. Ciliegi
Istituto nazionale di astrofisica (INAF)
N. Jurlin
University of Groningen
Netherlands Institute for Radio Astronomy (ASTRON)
L. Ceraj
University of Zagreb
K. Tisanic
University of Zagreb
M. Birkinshaw
University of Bristol
M. Bremer
University of Bristol
L. Chiappetti
IASF Milano
Cathy Horellou
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
M. Huynh
University of Western Australia
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
H. Intema
Leiden University
K. Kolokythas
North-West University
M. Pierre
Paris Diderot University
S. Raychaudhury
Inter-University Centre for Astronomy and Astrophysics
H. Rottgering
Leiden University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 638 A46Subject Categories
Accelerator Physics and Instrumentation
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201937258