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Spectral index properties of milliJansky radio sources
journal contribution
posted on 2023-05-17, 12:30 authored by Randall, KE, Hopkins, AM, Norris, RP, Zinn, P-C, Middelberg, E, Mao, MY, Sharp, RGAt 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.
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
421Pagination
1644-1660ISSN
0035-8711Department/School
School of Natural SciencesPublisher
Blackwell Publishing LtdPlace of publication
9600 Garsington Rd, Oxford, England, Oxon, Ox4 2DgRights statement
Copyright 2012 RASRepository Status
- Restricted