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arXiv 0911.0002astro-ph.GA
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澳大利亚望远镜20 GHz巡天:源目录

The Australia Telescope 20 GHz Survey: The Source Catalogue

Tara Murphy, Elaine M. Sadler, Ronald D. Ekers, Marcella Massardi, Paul J. Hancock, Elizabeth Mahony, Roberto Ricci, Sarah Burke-Spolaor, Mark Calabretta, Rajan… 展开作者

Tara Murphy, Elaine M. Sadler, Ronald D. Ekers, Marcella Massardi, Paul J. Hancock, Elizabeth Mahony, Roberto Ricci, Sarah Burke-Spolaor, Mark Calabretta, Rajan Chhetri, Gianfranco De Zotti, Philip G. Edwards, Jennifer A. Ekers, Carole A. Jackson, Michael J. Kesteven, Emma Lindley, Katherine Newton-McGee, Chris Phillips, Paul Roberts, Robert J. Sault, Lister Staveley-Smith, Ravi Subrahmanyan, Mark A. Walker, Warwick E. Wilson

摘要:

我们提出了完整的源目录从澳大利亚望远镜20 GHz(AT 20 G)调查。AT 20 G是2004年至2008年使用澳大利亚望远镜紧凑阵列(ATCA)在20 GHz进行的盲射电调查,覆盖了10 ° C以南的整个天空。这里介绍的AT 20 G源目录是一个数量级大于任何以前的目录的高频无线电源,并包括5890源以上的20 GHz的通量密度限制为40 mJy。所有AT 20 G源的总强度和偏振测量在20 GHz,和大多数源南部的10度-15度也几乎同时通量密度测量在5和8 GHz。在三个频率中的一个或多个频率下,共检测到1559个偏振总强度源。我们检测到一个小的,但显着的人口的非热源,要么未被检测到或只有微弱的检测在低频目录。我们引入术语“超反转频谱”(UIS)来描述这些射电源,它们的频谱指数α(5,20)> +0.7,约占AT 20 G样本的1.2%。对最强的AT 20 G源测量的20 GHz通量密度与Wright等人(2009年)的WMAP 5年源目录非常一致,我们发现WMAP源目录接近完整,在23 GHz时强度超过1.5 Jy。

英文摘要:

We present the full source catalogue from the Australia Telescope 20 GHz (AT20G) Survey. The AT20G is a blind radio survey carried out at 20 GHz with the Australia Telescope Compact Array (ATCA) from 2004 to 2008, and covers the whole sky south of declination 0 deg. The AT20G source catalogue presented here is an order of magnitude larger than any previous catalogue of high-frequency radio sources, and includes 5890 sources above a 20 GHz flux-density limit of 40 mJy. All AT20G sources have total intensity and polarisation measured at 20 GHz, and most sources south of declination -15 deg also have near-simultaneous flux-density measurements at 5 and 8 GHz. A total of 1559 sources were detected in polarised total intensity at one or more of the three frequencies. We detect a small but significant population of non-thermal sources that are either undetected or have only weak detections in low-frequency catalogues. We introduce the term Ultra-Inverted Spectrum (UIS) to describe these radio sources, which have a spectral index alpha(5, 20) > +0.7 and which constitute roughly 1.2 per cent of the AT20G sample. The 20 GHz flux densities measured for the strongest AT20G sources are in excellent agreement with the WMAP 5-year source catalogue of Wright et al. (2009), and we find that the WMAP source catalogue is close to complete for sources stronger than 1.5 Jy at 23 GHz.

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