Star formation properties of sub-mJy radio sources
Authors: M. Bonzini, V. Mainieri, P. Padovani, P. Andreani, S. Berta, M. Bethermin, D. Lutz, G. Rodighiero, D. Rosario, P. Tozzi, S. Vattakunnel
AI-generated Key Points
- Investigated star formation properties of approximately 800 sources detected in a deep radio survey
- Sample covers redshifts from 0.1 to 4 and includes star forming galaxies (SFGs) and active galactic nuclei (AGNs)
- Compared star formation rate (SFR) derived from far infrared luminosity with SFR computed from radio emission
- Radio power serves as an accurate tracer for SFR in both pure SFGs and host galaxies of radio-quiet AGNs
- No significant deviation in relation to redshift or specific SFR
- Quantified contribution of starburst activity within SFGs and investigated AGN occurrence among different levels of star formation
- Provides insights into astrophysical processes contributing to overall star formation activity
- Deep radio surveys can be used as a tool for studying cosmic star formation history
- Contributes to understanding how stars form and evolve throughout cosmic history
- Highlights new avenues for future investigations using deep radio surveys
Abstract: We investigate the star formation properties of ~800 sources detected in one of the deepest radio surveys at 1.4 GHz. Our sample spans a wide redshift range (~0.1 - 4) and about four orders of magnitude in star formation rate (SFR). It includes both star forming galaxies (SFGs) and active galactic nuclei (AGNs), further divided into radio-quiet and radio-loud objects. We compare the SFR derived from the far infrared luminosity, as traced by Herschel, with the SFR computed from their radio emission. We find that the radio power is a good SFR tracer not only for pure SFGs but also in the host galaxies of RQ AGNs, with no significant deviation with redshift or specific SFR. Moreover, we quantify the contribution of the starburst activity in the SFGs population and the occurrence of AGNs in sources with different level of star formation. Finally we discuss the possibility of using deep radio survey as a tool to study the cosmic star formation history.
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