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Average radio spectral energy distribution of highly star-forming galaxies

Published online by Cambridge University Press:  08 May 2018

K. Tisanić ,
V. Smolčić ,
J. Delhaize ,
M. Novak ,
H. Intema ,
I. Delvecchio ,
E. Schinnerer  and
G. Zamorani
K. Tisanić
Affiliation:
Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, 10000 Zagreb, Croatia, email: ktisanic@phy.hr
V. Smolčić
Affiliation:
Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, 10000 Zagreb, Croatia, email: ktisanic@phy.hr
J. Delhaize
Affiliation:
Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, 10000 Zagreb, Croatia, email: ktisanic@phy.hr
M. Novak
Affiliation:
Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, 10000 Zagreb, Croatia, email: ktisanic@phy.hr
H. Intema
Affiliation:
Leiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
I. Delvecchio
Affiliation:
Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, 10000 Zagreb, Croatia, email: ktisanic@phy.hr
E. Schinnerer
Affiliation:
MPI for Astronomy, Königstuhl 17, D-69117, Heidelberg, Germany
G. Zamorani
Affiliation:
INAF-Osservatorio Astronomico di Bologna, via Gobetti 93/3, 40129, Bologna, Italy
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Abstract

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The infrared-radio correlation (IRRC) offers a way to assess star formation from radio emission. Multiple studies found the IRRC to decrease with increasing redshift. This may in part be due to the lack of knowledge about the possible radio spectral energy distributions (SEDs) of star-forming galaxies. We constrain the radio SED of a complete sample of highly star-forming galaxies (SFR > 100 M⊙/ yr) based on the VLA-COSMOS 1.4 GHz Joint and 3 GHz Large Project catalogs. We reduce archival GMRT 325 MHz and 610 MHz observations, broadening the rest-frame frequency range to 0.3-15 GHz. Employing survival analysis and fitting a double power law SED, we find that the slope steepens from a spectral index of α1 = 0.51±0.04 below 4.5 GHz to α2 = 0.98±0.07 above 4.5 GHz. Our results suggest that the use of a K-correction assuming a single power-law radio SED for star forming galaxies is likely not the root cause of the IRRC trend.

Keywords

Galaxy: evolutiongalaxies: statisticsradio continuum: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 191 - 194
Copyright
Copyright © International Astronomical Union 2018 

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