阿雷西博星系环境调查：II。阿贝尔星团1367及其外围的HI视图
The Arecibo Galaxy Environment Survey: II. A HI view of the Abell cluster 1367 and its outskirts
摘要：
我们提出了21厘米HI线观测的5x1平方度的本地阿贝尔集群1367作为阿雷西博星系环境调查的一部分。探测到100个源（79个新的HI测量和50个新的红移），其中一半以上属于星团核心及其落区。结合HI数据与SDSS光学成像，我们表明，我们的HI选择的样品遵循类似的尺度关系，通常观察到的光学选择的样品。有趣的是，我们样本中的所有星系似乎都具有几乎相同的重子分数，而与它们的大小、表面亮度和光度无关。HI和光学选择样本之间最显著的区别在于它们的大尺度分布：而光学和X射线观测可以很好地跟踪星团核心，在HI中几乎没有星团存在的证据。本文还讨论了不同波长样品的团簇光度函数和HI分布的测定。
英文摘要：
We present 21 cm HI line observations of 5x1 square degrees centered on the local Abell cluster 1367 obtained as part of the Arecibo Galaxy Environment Survey. One hundred sources are detected (79 new HI measurements and 50 new redshifts), more than half belonging to the cluster core and its infalling region. Combining the HI data with SDSS optical imaging we show that our HI selected sample follows scaling relations similar to the ones usually observed in optically selected samples. Interestingly all galaxies in our sample appear to have nearly the same baryon fraction independently of their size, surface brightness and luminosity. The most striking difference between HI and optically selected samples resides in their large scale distribution: whereas optical and X-ray observations trace the cluster core very well, in HI there is almost no evidence of the presence of the cluster. Some implications on the determination of the cluster luminosity function and HI distribution for samples selected at different wavelength are also discussed.
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