对玉夫座群和细丝的深Parkes HI巡天：HI质量函数和环境
A deep Parkes HI survey of the Sculptor group and filament: HI mass function and environment
摘要：
我们提出了一个深入调查的结果，附近的玉夫座集团和相关的玉夫座灯丝与帕克斯64米射电望远镜在21厘米的中性氢发射线。我们检测到31个HI源的雕塑家组/灯丝，其中8个是新的HI检测。我们推导出一个斜率的HI质量函数沿雕塑家灯丝的$α= -1.10^{+0.20}_{-0.11}$，这是显着平坦的整体质量函数，并与以前发现的其他低密度组环境中的平坦斜坡一致。因此，一些物理过程，如恒星形成，光电离或冲压压力剥离，必须负责主要从低质量星系中去除中性气体。我们所有的HI探测都有一个确认的或暂定的光学对应物，并且可能与发光而不是“暗”星系有关。尽管柱密度的灵敏度约为$4 \times 10^{17}~\mathrm{cm}^{-2}$，我们没有发现任何河外气体或潮汐流的痕迹，这表明玉夫座暗条目前是一个相对静止的环境，没有看到任何最近的重大相互作用或合并。
英文摘要：
We present the results of a deep survey of the nearby Sculptor group and the associated Sculptor filament taken with the Parkes 64-m radio telescope in the 21-cm emission line of neutral hydrogen. We detect 31 HI sources in the Sculptor group/filament, eight of which are new HI detections. We derive a slope of the HI mass function along the Sculptor filament of $α= -1.10^{+0.20}_{-0.11}$, which is significantly flatter than the global mass function and consistent with the flat slopes previously found in other low-density group environments. Some physical process, such as star formation, photoionisation or ram-pressure stripping, must therefore be responsible for removing neutral gas predominantly from low-mass galaxies. All of our HI detections have a confirmed or tentative optical counterpart and are likely associated with luminous rather than 'dark' galaxies. Despite a column density sensitivity of about $4 \times 10^{17}~\mathrm{cm}^{-2}$, we do not find any traces of extragalactic gas or tidal streams, suggesting that the Sculptor filament is, at the current time, a relatively quiescent environment that has not seen any recent major interactions or mergers.
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