Journal Article

Spectral index properties of milliJansky radio sources

K. E. Randall, A. M. Hopkins, R. P. Norris, P.-C. Zinn, E. Middelberg, M. Y. Mao and R. G. Sharp

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 2, pages 1644-1660
Published in print April 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20422.x
Spectral index properties of milliJansky radio sources

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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.

Keywords: catalogues; galaxies: active; galaxies: evolution; radio continuum: galaxies

Journal Article.  11669 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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