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Spectral index properties of milliJansky radio sources


Randall, KE and Hopkins, AM and Norris, RP and Zinn, P-C and Middelberg, E and Mao, MY and Sharp, RG, Spectral index properties of milliJansky radio sources, Monthly Notices of the Royal Astronomical Society, 421, (2) pp. 1644-1660. ISSN 0035-8711 (2012) [Refereed Article]

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Copyright Statement

Copyright 2012 RAS

DOI: doi:10.1111/j.1365-2966.2012.20422.x


At the faintest radio flux densities (S1.4 < 10 mJy), conflicting results have arisen regarding whether there is a flattening of the average spectral index between a low radio frequency (325 or 610 MHz) and, for example, 1.4 GHz. We present a new catalogue of 843-MHz radio sources in the European Large Area ISO Survey-South 1 field, which contains the sources, their Australia Telescope Large Area Survey (ATLAS) counterparts and the spectral index distribution of the sources as a function of flux density. We do not find any statistically significant evidence for a trend towards flatter spectral indices with decreasing flux density. We then investigate the spectral index distribution with redshift for those sources with reliable redshifts and explore the infrared properties. An initial sample of faint compact steep-spectrum sources in ATLAS are also presented, with a brief overview of their properties.

Item Details

Item Type:Refereed Article
Keywords:catalogues; galaxies: active; galaxies: evolution; radio continuum: galaxies
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Mao, MY (Miss Minnie Mao)
ID Code:78628
Year Published:2012
Web of Science® Times Cited:33
Deposited By:Mathematics and Physics
Deposited On:2012-07-10
Last Modified:2013-04-04

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