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

doi:10.1111/j.1365-2966.2012.20422.x

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 journal › Article › peer-review

46 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	1644-1660
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	421
Issue number	2
DOIs	https://doi.org/10.1111/j.1365-2966.2012.20422.x
Publication status	Published - Apr 2012

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title = "Spectral index properties of milliJansky radio sources",

abstract = "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.",

keywords = "Catalogues, Galaxies: active, Galaxies: evolution, Radio continuum: galaxies",

author = "Randall, {K. E.} and Hopkins, {A. M.} and Norris, {R. P.} and Zinn, {P. C.} and E. Middelberg and Mao, {M. Y.} and Sharp, {R. G.}",

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doi = "10.1111/j.1365-2966.2012.20422.x",

language = "English",

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AU - Randall, K. E.

AU - Hopkins, A. M.

AU - Norris, R. P.

AU - Zinn, P. C.

AU - Middelberg, E.

AU - Mao, M. Y.

AU - Sharp, R. G.

PY - 2012/4

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N2 - 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.

AB - 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.

KW - Catalogues

KW - Galaxies: active

KW - Galaxies: evolution

KW - Radio continuum: galaxies

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EP - 1660

JO - Monthly Notices of the Royal Astronomical Society

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ER -

Spectral index properties of milliJansky radio sources

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