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• W3212368937 abstract "The radio emission from faint extra-galactic sources hugely improves the study of cosmic evolution of star-forming galaxies (SFGs) and active galactic nuclei (AGN). Here, we study the faint sources in the ELAIS-N1 field using deep uGMRT observations in the 300--500 MHz frequency range, covering an area of 1.8 deg$^2$ with a sensitivity of $15 mu$Jy beam$^{-1}$. Using a host of multi-waveband data in the infrared and spectroscopy in the optical, we broadly classify the sources as SFGs and AGN, and study the statistical properties of the radio--infrared relations up to redshift $z =$ 2 by $k$-correcting the observed data to rest-frame. We study the redshift variation of the monochromatic $q$ parameters at 24 and $70mu$m, $q_{rm 24mu m}$ and $q_{rm 70mu m}$, respectively, and of bolometric $q_{rm TIR}$ after integrating the infrared spectrum between 8 and $1000mu$m. In our study $q_{24mu m}$ is found to increase with $z$ caused by an increase in dust temperature ($T_{rm dust}$) of the flux-limited sample at mid-infrared wavelengths. The $q_{rm 70mu m}$ and $q_{rm TIR}$ are largely unaffected by $T_{rm dust}$ variation in the sample and show a mild decrease with $z$ given as $q_{rm 70mu m} = (2.34 pm 0.03)(1+z)^{-0.13 pm 0.03}$ and $q_{rm TIR} = (2.60 pm 0.03)(1+z)^{-0.11 pm 0.02}$. We observe tight correlations between the radio luminosity at 1.4GHz ($L_{rm 1.4GHz}$) with monochromatic infrared luminosities at $24mu$m ($L_{rm 24mu m}$) and at $70mu$m ($L_{rm 70mu m}$), and with bolometric infrared luminosity ($L_{rm TIR}$) having scatter less than a factor of 2 for SFGs up to $z=2$. All the radio--infrared relations have significant non-linear slopes. Such non-linearity could result in the $q$ parameters varying with redshift making it a complication for using them to study the evolution of the radio--infrared relations." @default.
• W3212368937 created "2021-11-22" @default.
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• W3212368937 date "2021-11-16" @default.
• W3212368937 modified "2023-10-13" @default.
• W3212368937 title "Deep uGMRT observations of the ELAIS-North 1 field: statistical properties of radio--infrared relations up to $z sim$2" @default.
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