Cosmic Star-Formation History Measured at 1.4 GHz

Abstract

We matched the 1.4 GHz local luminosity functions of star-forming galaxies (SFGs) and active galactic nuclei to the 1.4 GHz differential source counts from $0.25\mu \mathrm{Jy}$ to 25 Jy using combinations of luminosity and density evolution. We present the most robust and complete local far-infrared (FIR)/radio luminosity correlation to date in a volume-limited sample of $\approx 4.3\times 10^3$ nearby SFGs, finding that it is very tight but distinctly sub-linear: $L_{\mathrm{FIR}}\propto L_{1.4\mathrm{GHz}}^{0.85}$. If the local FIR/radio correlation does not evolve, the evolving 1.4 GHz luminosity function of SFGs yields the evolving star-formation rate density (SFRD) $\psi (M_{\odot }{\mathrm{year}}^{-1}{\mathrm{Mpc}}^{-3}$) as a function of time since the big bang. The SFRD measured at 1.4 GHz grows rapidly at early times, peaks at "cosmic noon" when $t\approx 3\mathrm{Gyr}$ and $z\approx 2$, and subsequently decays with an $e$-folding time scale $\tau =3.2\mathrm{Gyr}$. This evolution is similar to, but somewhat stronger than, SFRD evolution estimated from UV and FIR data.

arXiv comment19 pages, 13 figures; accepted for publication in ApJ

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