2021A&A...656A..48B


Query : 2021A&A...656A..48B

2021A&A...656A..48B - Astronomy and Astrophysics, volume 656A, 48-48 (2021/12-1)

The LOFAR Two-metre Sky Survey Deep Fields. A new analysis of low-frequency radio luminosity as a star-formation tracer in the Lockman Hole region.

BONATO M., PRANDONI I., DE ZOTTI G., BEST P.N., BONDI M., CALISTRO RIVERA G., COCHRANE R.K., GURKAN G., HASKELL P., KONDAPALLY R., MAGLIOCCHETTI M., LESLIE S.K., MALEK K., ROTTGERING H.J.A., SMITH D.J.B., TASSE C. and WANG L.

Abstract (from CDS):

We have exploited LOFAR deep observations of the Lockman Hole field at 150 MHz to investigate the relation between the radio luminosity of star-forming galaxies (SFGs) and their star-formation rates (SFRs), as well as its dependence on stellar mass and redshift. The adopted source classification, SFRs, and stellar masses are consensus estimates based on a combination of four different spectral energy distribution fitting methods. We note a flattening of the radio spectra of a substantial minority of sources below ∼1.4 GHz. Such sources have thus a lower 'radio-loudness' level at 150 MHz than expected from extrapolations from 1.4 GHz using the average spectral index. We found a weak trend towards a lower SFR/L_150 MHz_ ratio for higher stellar mass, M*. We argue that such a trend may account for most of the apparent redshift evolution of the L_150 MHz_/SFR ratio, in line with previous work. Our data indicate a weaker evolution than found by some previous analyses. We also find a weaker evolution with redshift of the specific SFR than found by several (but not all) previous studies. Our radio selection provides a view of the distribution of galaxies in the SFR-M* plane complementary to that of optical and near-IR selection. It suggests a higher uniformity of the star-formation history of galaxies than implied by some analyses of optical and near-IR data. We have derived luminosity functions at 150 MHz of both SFGs and radio-quiet (RQ) AGN at various redshifts. Our results are in very good agreement with the T-RECS simulations and with literature estimates. We also present explicit estimates of SFR functions of SFGs and RQ AGN at several redshifts derived from our radio survey data.

Abstract Copyright: © ESO 2021

Journal keyword(s): galaxies: star formation - galaxies: evolution

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2676 0
2 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 808 0
3 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1131 0
4 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 371 0
5 ELAIS N1 reg 16 10 01 +54 30.6           ~ 377 0

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2023.01.31-02:12:03

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