SUMSS: a wide-field radio imaging survey of the southern sky – II. The source catalogue
SUMSS: a wide-field radio imaging survey of the southern sky – II. The source catalogue
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DOI：
10.1046/j.1365-8711.2003.06605.x
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发表时间：
2003-03
影响因子：
4.8
通讯作者：
T. Mauch;T. Murphy;H. Buttery;J. Curran;R. Hunstead;B. Piestrzynski;J. Robertson;E. B. G. U. O. Sydney;U. Cambridge
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文献类型：
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作者：
T. Mauch;T. Murphy;H. Buttery;J. Curran;R. Hunstead;B. Piestrzynski;J. Robertson;E. B. G. U. O. Sydney;U. Cambridge
本文是描述悉尼大学莫龙洛天文台综合望远镜（MOST）在843 MHz进行的莫龙洛巡天（SUMSS）系列中的第二篇。这次调查将包括1590张4.3° x 4.3°的镶嵌图像，分辨率为45 x 45 cosec/δ π arcsec 2，以及一份源目录。在本文中，我们描述了源目录的初始版本（1.0版），该源目录由107 765个射电源组成，通过将271个SUMSS 4.3° × 4.3°马赛克中的椭圆高斯拟合到δ ≤-50 °时的极限峰值亮度为6 mJy beam - 1，δ > -50°时为10 mJy beam - 1。星表覆盖了南天约3500度2的区域，δ ≤ -30°，约占总观测面积的43%。对于峰值亮度A843 ≥ 20 mJy束-1的源，星表中的位置精确到1-2角秒，并且总是优于10角秒。内部通量密度标度的精确度在3%以内，使用决策树对图像伪影进行分类，在96%以上的情况下，该决策树能正确识别和剔除假源。星表分析表明，它是高度均匀的，在δ ≤ -50°时为8 mJy，在δ > -50°时为18 mJy。在这次发布的目录中，在与国家射电天文台甚大阵列巡天在1.4 GHz的重叠区域中发现了大约7000个源。我们计算出在1.4 GHz和843 MHz之间的中值谱指数a = -0.83。这一版本的目录将通过万维网发布，并随着新的马赛克的发布而不断更新。
This paper is the second in a series describing the Sydney University Molonglo Sky Survey (SUMSS) being carried out at 843 MHz with the Molonglo Observatory Synthesis Telescope (MOST). The survey will consist of ∼590 4.3° x 4.3° mosaic images with 45 x 45 cosec‖δ‖ arcsec 2 resolution, and a source catalogue. In this paper we describe the initial release (version 1.0) of the source catalogue consisting of 107 765 radio sources made by fitting elliptical Gaussians in 271 SUMSS 4.3° × 4.3° mosaics to a limiting peak brightness of 6 mJy beam - 1 at δ ≤ -50° and 10 mJy beam - 1 at δ > -50°. The catalogue covers approximately 3500 deg 2 of the southern sky with δ ≤ -30°, about 43 per cent of the total survey area. Positions in the catalogue are accurate to within 1-2 arcsec for sources with peak brightness A 8 4 3 ≥ 20 mJy beam - 1 and are always better than 10 arcsec. The internal flux density scale is accurate to within 3 per cent. Image artefacts have been classified using a decision tree, which correctly identifies and rejects spurious sources in over 96 per cent of cases. Analysis of the catalogue shows that it is highly uniform and is complete to 8 mJy at δ ≤ -50° and 18 mJy at δ > -50°. In this release of the catalogue about 7000 sources are found in the overlap region with the National Radio Astronomy Observatories Very Large Array Sky Survey at 1.4 GHz. We calculate a median spectral index of a = -0.83 between 1.4 GHz and 843 MHz. This version of the catalogue will be released via the World Wide Web with future updates as new mosaics are released.