Categorising the sub-mJy population: Star-forming galaxies from deep radio surveys

Tom Dwelly, Nick Seymour, Ian McHardy, Derek Moss, Abdu Zhogbi, Mathew Page, Andrew Hopkins, George Rieke, Nicola Loaring

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Abstract

Models predict that starforming galaxies make up the majority of the source population detected in the very deepest radio surveys. Radio selected samples of starforming galaxies are therefore a potentially excellent method to chart e.g. the cosmic history of star-formation. However, a significant minority of the faintest radio sources are AGN powered 'contaminants', and must be removed from any solely star-formation powered sample. Here we descibe a multi-pronged method for spearating star-forming and AGN powered sources in a deep 1.4 GHz radio survey. We utilise a wealth of multi-wavelength information, including radio spectral and morphological information and radio to mid-IR SED modelling, to select a clean sample of star-formation powered sources. We then derive the 1.4 GHz source counts separately for AGN and SFGs, calculate an independent measure of the evolving star-formation rate density to z∼2, and compare our results to the star-formation rate density determined at other wavelengths.

Original languageEnglish
Title of host publicationMRU 2007
Subtitle of host publicationFrom Planets to Dark Energy: the Modern Radio Universe
Place of PublicationManchester, UK
PublisherScuola Internazionale Superiore di Studi Avanzati (SISSA)
Chapter051
Number of pages5
DOIs
Publication statusPublished - 2007
Externally publishedYes
EventMRU 2007: From Planets to Dark Energy: The Modern Radio Universe, - Manchester, United Kingdom
Duration: 1 Oct 20075 Oct 2007

Publication series

NameProceedings of Science
PublisherSissa
Volume52
ISSN (Print)1824-8039

Conference

ConferenceMRU 2007
Country/TerritoryUnited Kingdom
CityManchester
Period1/10/075/10/07

Bibliographical note

Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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