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The far-infrared/radio correlation for a sample of strongly lensed dusty star-forming galaxies detected by Herschel

Giulietti, M, Massardi, M, Lapi, A, Bonato, M, Enia, A F M, Negrello, Mattia ORCID:, D'Amato, Q, Behiri, M and De Zotti, G 2022. The far-infrared/radio correlation for a sample of strongly lensed dusty star-forming galaxies detected by Herschel. Monthly Notices of the Royal Astronomical Society 511 (1) , 1408–1419. 10.1093/mnras/stac145

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We investigate the radio/far-infrared (FIR) correlation for a sample of 28 bright high-redshift (1 ≲ z ≲ 4) star-forming galaxies selected in the FIR from the Herschel-ATLAS fields as candidates to be strongly gravitationally lensed. The radio information comes either from high sensitivity dedicated Australia Telescope Compact Array observations at 2.1 GHz or from cross-matches with the FIRST survey at 1.4 GHz. By taking advantage of source brightness possibly enhanced by lensing magnification, we identify a weak evolution with redshift out to z ≲ 4 of the FIR-to-radio luminosity ratio qFIR. We also find that the qFIR parameter as a function of the radio power L1.4GHz displays a clear decreasing trend, similarly to what is observed for optically/radio-selected lensed quasars found in literature, yet covering a complementary region in the qFIR−L1.4GHz diagram. We interpret such a behaviour in the framework of an in situ galaxy formation scenario, as a result of the transition from an early dust-obscured star-forming phase (mainly pinpointed by our FIR selection) to a late radio-loud quasar phase (preferentially sampled by the optical/radio selection).

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 26 January 2023
Date of Acceptance: 16 January 2022
Last Modified: 03 May 2023 08:15

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