Cosmic evolution of star-forming galaxies to z 1.8 in the faint low-frequency radio source population
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Date
2019
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Publisher
Oxford University Press
Abstract
We study the properties of star-forming galaxies selected at 610 MHz with the GMRT in a survey covering ∼1.86 deg2 down to a noise of ∼7.1 μJy beam−1. These were identified by combining multiple classification diagnostics: optical, X-ray, infrared, and radio data. Of the 1685 SFGs from the GMRT sample, 496 have spectroscopic redshifts whereas 1189 have photometric redshifts. We find that the IRRC of star-forming galaxies, quantified by the infrared-to-1.4 GHz radio luminosity ratio qIR, decreases with increasing redshift: qIR=2.86±0.04(1+z)−0.20±0.02 out to z ∼ 1.8. We use the V/Vmax statistic to quantify the evolution of the comoving space density of the SFG sample. Averaged over luminosity our results indicate ⟨V/Vmax⟩ to be 0.51±0.06, which is consistent with no evolution in overall space density. However, we find V/Vmax to be a function of radio luminosity, indicating strong luminosity evolution with redshift.
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Keywords
Galaxies: luminosity function, Galaxies: starburst, Large-scale structure of Universe, Radio continuum: galaxies, Low-frequency radio
Citation
Ocran, E. F. et al. (2019). Cosmic evolution of star-forming galaxies to z 1.8 in the faint low-frequency radio source population. Monthly Notices of the Royal Astronomical Society, 491(4), 5911–5924