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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, RG
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.

History

Publication title

Monthly Notices of the Royal Astronomical Society

Volume

421

Pagination

1644-1660

ISSN

0035-8711

Department/School

School of Natural Sciences

Publisher

Blackwell Publishing Ltd

Place of publication

9600 Garsington Rd, Oxford, England, Oxon, Ox4 2Dg

Rights statement

Copyright 2012 RAS

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

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