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The Astrophysical journal, 2021-06, Vol.914 (2), p.126
Ort / Verlag
Philadelphia: The American Astronomical Society
Erscheinungsjahr
2021
Quelle
EZB Free E-Journals
Beschreibungen/Notizen
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
μ
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 ≈4.3 × 10
3
nearby SFGs, finding that it is very tight but distinctly sublinear:
L
FIR
∝
L
1.4
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)
ψ
(
M
⊙
yr
−1
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
≈ 3 Gyr and
z
≈ 2, and subsequently decays with an
e
-folding timescale
τ
= 3.2 Gyr. This evolution is similar to, but somewhat stronger than, SFRD evolution estimated from UV and FIR data.