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A Blind H I Survey for Galaxies in the Zone of Avoidance, 308° ≤ l ≤ 332°

机译:避开区308°≤l≤332°的星系盲H I测量

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We report on a blind neutral hydrogen survey for galaxies using the 21 cm multibeam receiver on the Parkes 64 m telescope. The surveyed region covers |b| ≤ 5° in the zone of avoidance (ZOA) from Galactic longitude 308° to 332°. The survey represents the first phase of a blind H I survey covering the southern ZOA (l = 212° to 36°). We have detected H I in 42 galaxies above a 3 σ limit of 60 mJy. The galaxies detected in this survey have velocities out to 6000 km s-1 and H I masses in the range 4 × 107 to 3 × 1010M⊙ (h). Only eight of the 42 galaxies have velocities previously measured. A further nine galaxies appear to have optical counterparts in the Woudt's 1998 catalog. In total, 16 of the galaxies appear to be associated with IRAS sources, although only three of these are without optical counterparts. The estimated median extinction for the 20 galaxies with optical or IR counterparts is AB = 3.8 mag. For the 22 galaxies with no counterparts, the estimated median extinction is AB = 5.6 mag. The distribution of galaxies is suggestive of a connection between the Centaurus supercluster above the Galactic plane and the Pavo-Indus supercluster beneath the plane. No previously hidden concentrations of galaxies were found.
机译:我们报告了使用Parkes 64 m望远镜上的21 cm多波束接收器对星系进行的盲中性氢调查。被调查区域包括| b |从银河经度308°到332°的回避区(ZOA)≤5°。该调查代表了涵盖南部ZOA(l = 212°至36°)的盲目H I调查的第一阶段。我们已经在超过60兆焦耳的3σ极限的42个星系中检测到HI。在这次调查中发现的星系的速度高达6000 km s-1,H I的质量范围为4×107至3×1010M⊙(h)。 42个星系中只有8个具有先前测得的速度。 Woudt 1998年的目录中似乎又有9个银河系。总共有16个星系似乎与IRAS源有关,尽管其中只有3个没有光学对应物。估计有光学或红外对应星系的20个星系的灭绝中位数为AB = 3.8 mag。对于22个没有对应星系的星系,估计的灭绝中位数为AB = 5.6 mag。星系的分布表明银河系平面上方的半人马座超级集群与平面下方的Pavo-Indus超集群之间存在联系。没有发现以前隐藏的银河系。

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