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.


galaxies: nuclei

galaxies: active

accretion disks

radio continuum: galaxies

galaxies: evolution


B. Slaus

University of Zagreb

V Smolcic

University of Zagreb

M. Novak

Max Planck Society

S. Fotopoulou

Durham University

University of Geneva

P. Ciliegi

INAF OAS Bologna

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, Extragalactic Astrophysics

M. Huynh

CSIRO Astronomy and Space Science

University of Western Australia

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 A46

Subject Categories

Accelerator Physics and Instrumentation

Astronomy, Astrophysics and Cosmology



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