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arXiv 1209.4338astro-ph.GAastro-ph.CO
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阿雷西博星系环境巡天VI:室女星系团(II)

The Arecibo Galaxy Environment Survey VI : The Virgo Cluster (II)

R. Taylor, J. I. Davies, R. Auld, R. F. Minchin, R. Smith

摘要:

我们提出了21厘米的观测5度区域的室女星系团,作为阿雷西博星系环境调查的一部分。检测到13个集群成员,以及背景中的36个对象。我们将该区域的结果与更大的10 x度区域进行比较和对比。我们结合这两个数据集,以产生一个HI质量函数,它显示出更高的检测率在低质量(但发现更少的大质量星系)比不太敏感的广域调查,如ALCAFA。我们发现,HI检测到的星系分布不同的非检测,无论是在空间上和速度,提供进一步的证据表明,集群仍在组装。我们使用塔利-费舍尔关系来研究形态进化的可能性。我们发现,高度缺乏的星系,以及一些早期类型的星系,有更低的速度宽度比塔利-费舍尔关系预测,表明气体损失通过冲压压力剥离。我们还发现,没有光学对应的HI检测不符合重子塔利-费舍尔关系的预测,这意味着它们不是原始对象。

英文摘要:

We present 21 cm observations of a 5 x degree region in the Virgo cluster, obtained as part of the Arecibo Galaxy Environment Survey. 13 cluster members are detected, together with 36 objects in the background. We compare and contrast the results from this area with a larger 10 x degree region. We combine the two data sets to produce an HI mass function, which shows a higher detection rate at low masses (but finds fewer massive galaxies) than less sensitive wider-area surveys, such as ALFALFA. We find that the HI-detected galaxies are distributed differently to the non-detections, both spatially and in velocity, providing further evidence that the cluster is still assembling. We use the Tully-Fisher relation to examine the possibility of morphological evolution. We find that highly deficient galaxies, as well as some early-type galaxies, have much lower velocity widths than the Tully-Fisher relation predicts, indicating gas loss via ram pressure stripping. We also find that HI detections without optical counterparts do not fit the predictions of the baryonic Tully-Fisher relation, implying that they are not primordial objects.

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