The evolution of the low-frequency radio AGN population to z 1.5 in the ELAIS N1 field
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Date
2021
Authors
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Publisher
Oxford University Press
Abstract
We study the cosmic evolution of radio sources out to z ≃ 1.5 using a GMRT 610 MHz survey covering ∼1.86 deg2 of the ELAIS N1 field with a minimum/median rms noise 7.1/19.5 μJy beam−1 and an angular resolution of 6 arcsec. We classify sources as star forming galaxies (SFGs), radio-quiet (RQ) and radio-loud (RL) Active Galactic Nuclei (AGNs) using a combination of multiwavelength diagnostics and find evidence in support of the radio emission in SFGs and RQ AGN arising from star formation, rather than AGN-related processes. At high luminosities, however, both SFGs and RQ AGN display a radio excess when comparing radio and infrared star formation rates.
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Keywords
Galaxies: active, Galaxies: luminosity function, Large-scale structure of Universe, Radio continuum: galaxies, Low-frequency radio
Citation
Ocran, E. F. et al. (2021). The evolution of the low-frequency radio AGN population to z 1.5 in the ELAIS N1 field. Monthly Notices of the Royal Astronomical Society, 500(4) , 4685–4702