Radio Sources in the Nearby Universe

Abstract

We identified 15,658 NVSS radio sources among the 55,288 2MASX galaxies brighter than $k_{20fe}=12.25$ at $\lambda =2.16\mu \mathrm{m}$ and covering the $\Omega =7.016$ sr of sky defined by J2000 $\delta >-40^{\circ }$ and $|b|>20^{\circ }$. The complete sample of 15,043 galaxies with 1.4 GHz flux densities $S\ge 2.45\mathrm{mJy}$ contains a 99.9% spectroscopically complete subsample of 9,517 galaxies with $k_{20fe}\le 11.75$. We used only radio and infrared data to quantitatively distinguish radio sources powered primarily by recent star formation from those powered by active galactic nuclei. The radio sources with $\log [L({\mathrm{W}\mathrm{Hz}}^{-1})]>19.3$ that we used to derive the local spectral luminosity and power-density functions account for $>99$% of the total 1.4~GHz spectral power densities $U_{\mathrm{SF}}=(1.54\pm 0.20)\times 10^{19}{\mathrm{W}\mathrm{Hz}}^{-1}{\mathrm{Mpc}}^{-3}$ and $U_{\mathrm{AGN}}=(4.23\pm 0.78)\times 10^{19}{\mathrm{W}\mathrm{Hz}}^{-1}{\mathrm{Mpc}}^{-3}$ in the universe today, and the spectroscopic subsample is large enough that the quoted errors are dominated cosmic variance. The recent comoving star-formation rate density indicated by $U_{\mathrm{SF}}$ is $\psi \approx 0.015M_{\odot }{\mathrm{yr}}^{-1}{\mathrm{Mpc}}^{-3}$.

ApJ, accepted. 22 pages

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