Algera, Hiddo S. B., Hodge, Jacqueline A., Riechers, Dominik A., Leslie, Sarah K., Smail, Ian ORCID: 0000-0003-3037-257X, Aravena, Manuel, da Cunha, Elisabete ORCID: 0000-0001-9759-4797, Daddi, Emanuele ORCID: 0000-0002-3331-9590, Decarli, Roberto, Dickinson, Mark, Gim, Hansung B., Guaita, Lucia, Magnelli, Benjamin, Murphy, Eric J., Pavesi, Riccardo, Sargent, Mark T., Sharon, Chelsea E., Wagg, Jeff, Walter, Fabian ORCID: 0000-0003-4793-7880 and Yun, Min (2022). COLDz: Probing Cosmic Star Formation With Radio Free-Free Emission. Astrophys. J., 924 (2). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

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Abstract

Radio free-free emission is considered to be one of the most reliable tracers of star formation in galaxies. However, as it constitutes the faintest part of the radio spectrum-being roughly an order of magnitude less luminous than radio synchrotron emission at the GHz frequencies typically targeted in radio surveys-the usage of free-free emission as a star formation rate tracer has mostly remained limited to the local universe. Here, we perform a multifrequency radio stacking analysis using deep Karl G. Jansky Very Large Array observations at 1.4, 3, 5, 10, and 34 GHz in the COSMOS and GOODS-North fields to probe free-free emission in typical galaxies at the peak of cosmic star formation. We find that z similar to 0.5-3 star-forming galaxies exhibit radio emission at rest-frame frequencies of similar to 65-90 GHz that is similar to 1.5-2 times fainter than would be expected from a simple combination of free-free and synchrotron emission, as in the prototypical starburst galaxy M82. We interpret this as a deficit in high-frequency synchrotron emission, while the level of free-free emission is as expected from M82. We additionally provide the first constraints on the cosmic star formation history using free-free emission at 0.5 less than or similar to z less than or similar to 3, which are in good agreement with more established tracers at high redshift. In the future, deep multifrequency radio surveys will be crucial in order to accurately determine the shape of the radio spectrum of faint star-forming galaxies, and to further establish radio free-free emission as a tracer of high-redshift star formation.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Algera, Hiddo S. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hodge, Jacqueline A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Riechers, Dominik A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leslie, Sarah K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Smail, IanUNSPECIFIEDorcid.org/0000-0003-3037-257XUNSPECIFIED
Aravena, ManuelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
da Cunha, ElisabeteUNSPECIFIEDorcid.org/0000-0001-9759-4797UNSPECIFIED
Daddi, EmanueleUNSPECIFIEDorcid.org/0000-0002-3331-9590UNSPECIFIED
Decarli, RobertoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dickinson, MarkUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gim, Hansung B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guaita, LuciaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Magnelli, BenjaminUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Murphy, Eric J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pavesi, RiccardoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sargent, Mark T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sharon, Chelsea E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wagg, JeffUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Walter, FabianUNSPECIFIEDorcid.org/0000-0003-4793-7880UNSPECIFIED
Yun, MinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-697099
DOI: 10.3847/1538-4357/ac34f5
Journal or Publication Title: Astrophys. J.
Volume: 924
Number: 2
Date: 2022
Publisher: IOP Publishing Ltd
Place of Publication: BRISTOL
ISSN: 1538-4357
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SPECTRAL ENERGY-DISTRIBUTION; GHZ LARGE PROJECT; FAR-INFRARED/RADIO CORRELATION; FORMATION RATE DENSITY; STELLAR MASS FUNCTION; FORMING GALAXIES; SUBMILLIMETER GALAXIES; FORMATION RATES; MAIN-SEQUENCE; ALMA SURVEYMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/69709

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