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arXiv 0909.3615astro-ph.CO
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室女星系团区贫气螺旋星系团的HI分布和Tully-Fisher距离

HI Distribution and Tully-Fisher Distances of Gas-Poor Spiral Galaxies in the Virgo Cluster Region

M. C. Toribio, J. M. Solanes

摘要:

本文利用CS配置的甚大阵射电望远镜对室女星系团区域螺旋星系NGC 4307、NGC 4356、NGC 4411 B和NGC 4492进行了21 cm点线的孔径合成观测。这些星系是在先前对室女座区域HI辐射三维分布的研究中发现的,它们是大量缺乏原子气体的天体,Tully-Fisher(TF)距离估计将它们定位在星系团主体之外。我们已经探测到另外两个星系位于我们的两个领域和观察带,螺旋NGC 4411 A和矮螺旋VCC 740。我们提供了所有这些星系的气体形态和运动学的详细信息。我们的新数据证实了除了NGC 4411 B之外的所有主要目标都存在强烈的HI缺陷,NGC 4411 B被发现具有相当正常的中性气体含量。VLA观测也被用来讨论TF技术对我们观测到的五个最大螺旋的适用性。我们的结论是,它们实际上都不适合TF距离评估,无论是由于中性氢盘(NGC 4307,NGC 4356和NGC 4492)的激进修剪,还是由于它们几乎面对面的取向(NGC 4411 A和B)。

英文摘要:

We present aperture synthesis observations in the 21 cm line of pointings centered on the Virgo Cluster region spirals NGC 4307, NGC 4356, NGC 4411B, and NGC 4492 using the Very Large Array (VLA) radiotelescope in its CS configuration. These galaxies were identified in a previous study of the three-dimensional distribution of HI emission in the Virgo region as objects with a substantial dearth of atomic gas and Tully-Fisher (TF) distance estimates that located them well outside the main body of the cluster. We have detected two other galaxies located in two of our fields and observed bands, the spiral NGC 4411A and the dwarf spiral VCC 740. We provide detailed information of the gas morphology and kinematics for all these galaxies. Our new data confirm the strong HI-deficiency of all the main targets but NGC 4411B, which is found to have a fairly normal neutral gas content. The VLA observations have also been used to discuss the applicability of TF techniques to the five largest spirals we have observed. We conclude that none of them is actually suitable for a TF distance evaluation, whether due to the radical trimming of their neutral hydrogen disks (NGC 4307, NGC 4356, and NGC 4492) or to their nearly face-on orientation (NGC 4411A and B).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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