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The LOFAR Two-metre Sky Survey Deep fields: The star formation rate - radio luminosity relation at low frequencies | | D.J.B. Smith
; P. Haskell
; G. Gürkan
; P.N. Best
; M.J. Hardcastle
; R. Kondapally
; W. Williams
; K.J. Duncan
; R.K. Cochrane
; I. McCheyne
; H.J.A. Röttgering
; J. Sabater
; T.W. Shimwell
; C. Tasse
; M. Bonato
; M. Bondi
; M.J. Jarvis
; S.K. Leslie
; I. Prandoni
; L. Wang
; | | Date: |
16 Nov 2020 | | Abstract: | In this paper, we investigate the relationship between 150MHz luminosity and
star formation rate (the SFR-L150 relation) using 150MHz measurements for a
near-infrared selected sample of 118,517 $z<1$ galaxies. New radio survey data
offer compelling advantages for studying star formation in galaxies, with huge
increases in sensitivity, survey speed and resolution over previous generation
surveys, and remaining impervious to extinction. The LOFAR Surveys Key Science
Project is transforming our understanding of the low-frequency radio sky, with
the 150MHz data over the ELAIS-N1 field reaching an RMS sensitivity of
20uJy/beam over 10 deg$^2$ at 6" resolution. All of the galaxies studied have
SFR and stellar mass estimates derived from energy balance SED fitting, using
redshifts and aperture-matched forced photometry from the LOFAR Two-metre Sky
Survey (LoTSS) deep fields data release. The impact of active galactic nuclei
is minimised by leveraging the deep ancillary data alongside outlier-resistant
median-likelihood methods. We find a linear and non-evolving SFR-L150 relation,
apparently consistent with expectations based on calorimetric arguments, down
to the lowest SFRs. However, we also recover compelling evidence for stellar
mass dependence in line with previous work on this topic, in the sense that
higher mass galaxies have a larger 150MHz luminosity at a given SFR, suggesting
that the overall agreement with calorimetric arguments may be a coincidence. We
conclude that in the absence of AGN, 150MHz observations can be used to measure
accurate galaxy SFRs out to $z=1$ at least, but it is necessary to account for
stellar mass in order to obtain 150MHz-derived SFRs accurate to <0.5 dex. Our
best-fit relation is $log_{10} (L_mathrm{150 MHz} / W,Hz^{-1}) = (0.90pm
0.01) log_{10}(psi/M_odot,mathrm{yr}^{-1}) + (0.33 pm 0.04) log_{10}
(M/10^{10}M_odot) + 22.22 pm 0.02$. (Abridged) | | Source: | arXiv, 2011.08196 | | Services: | Forum | Review | PDF | Favorites | |
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