莫隆格洛银道巡天（MGPS-2）：致密源表
The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue
摘要：
我们提出了第二个时代的Molonglo银河系平面调查（MGPS-2）的第一个数据发布。MGPS-2是用莫隆格洛天文台合成望远镜进行的，频率为843兆赫，恢复光束为45弧秒x 45弧秒/余弦（dec），使其成为对银河系南部平面进行的分辨率最高的大规模射电勘测。它覆盖了|b| < 10度和245度< l < 365度的范围，是悉尼大学莫隆格洛巡天（SUMSS）的银河对应物，后者覆盖了整个南方天空，dec <= -30度（|b| > 10度）。本文介绍MGPS-2紧源星表。该目录有48，850个源超过10 mJy/光束的极限峰值亮度。星表中的位置精确到1 arcsec - 2 arcsec。目前正在编制包括扩展源在内的完整目录。我们已经对银河平面上的致密源密度进行了分析，发现源密度在统计学上并不高于单独从河外源密度所预期的密度。我们还介绍了SUMSS图像数据和目录的2.0版，现已在网上提供。数据由629张4.3度x 4.3度的马赛克图像组成，覆盖8100度^2的天空，dec <= -30度，|b| > 10度。该星表包含210，412个射电源，在dec <= -50度时的极限峰值亮度为6 mJy/波束，在dec > -50度时为10 mJy/波束。我们描述了SUMSS编目过程的更新和改进。
英文摘要：
We present the first data release from the second epoch Molonglo Galactic Plane Survey (MGPS-2). MGPS-2 was carried out with the Molonglo Observatory Synthesis Telescope at a frequency of 843 MHz and with a restoring beam of 45 arcsec x 45 arcsec cosec(dec), making it the highest resolution large scale radio survey of the southern Galactic plane. It covers the range |b| < 10 deg and 245 deg < l < 365 deg and is the Galactic counterpart to the Sydney University Molonglo Sky Survey (SUMSS) which covers the whole southern sky with dec <= -30 deg (|b| > 10 deg). In this paper we present the MGPS-2 compact source catalogue. The catalogue has 48,850 sources above a limiting peak brightness of 10 mJy/beam. Positions in the catalogue are accurate to 1 arcsec - 2 arcsec. A full catalogue including extended sources is in preparation. We have carried out an analysis of the compact source density across the Galactic plane and find that the source density is not statistically higher than the density expected from the extragalactic source density alone. We also present version 2.0 of the SUMSS image data and catalogue which are now available online. The data consists of 629 4.3 deg x 4.3 deg mosaic images covering the 8100 deg^2 of sky with dec <= -30 deg and |b| > 10 deg. The catalogue contains 210,412 radio sources to a limiting peak brightness of 6 mJy/beam at dec <= -50 deg and 10 mJy/beam at dec > -50 deg. We describe the updates and improvements made to the SUMSS cataloguing process.
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