The Australia Telescope 20 GHz Survey: The Source Catalogue
| Autor: | Murphy, Tara, Sadler, Elaine M., Ekers, Ronald D., Massardi, Marcella, Hancock, Paul J., Mahony, Elizabeth, Ricci, Roberto, Burke-Spolaor, Sarah, Calabretta, Mark, Chhetri, Rajan, De Zotti, Gianfranco, Edwards, Philip G., Ekers, Jennifer A., Jackson, Carole A., Kesteven, Michael J., Lindley, Emma, Newton-McGee, Katherine, Phillips, Chris, Roberts, Paul, Sault, Robert J., Staveley-Smith, Lister, Subrahmanyan, Ravi, Walker, Mark A., Wilson, Warwick E. |
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| Rok vydání: | 2009 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2009.15961.x |
| Popis: | 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. Comment: 21 pages, accepted for publication in MNRAS |
| Databáze: | arXiv |
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