Spectral index properties of milliJansky radio sources

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


At the faintest radio flux densities (S 1.4 < 10mJy), conflicting results have arisen regarding whether there is a flattening of the average spectral index between a low radio frequency (325 or 610MHz) and, for example, 1.4GHz. 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.

Original languageEnglish
Pages (from-to)1644-1660
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - Apr 2012
Externally publishedYes


  • Catalogues
  • Galaxies: active
  • Galaxies: evolution
  • Radio continuum: galaxies


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