论文标题
嘻哈星系中的缺陷和不对称性
HI Deficiencies and Asymmetries in HIPASS Galaxies
论文作者
论文摘要
我们介绍了HI Parkes All-Sky调查（Hipass）检测到的中性氢（HI）缺陷和光谱不对称的天空分布，这是投影环境密度的函数。先前对使用嘻哈的星系HI缺乏症的研究对极度富裕或差的星系敏感。我们使用更新的Binning统计量来测量对平均缺陷敏感的HI缺乏症的全球天空分布。我们的分析证实了先前研究的结果，即处于密度的浓密环境中的星系平均比较低密度下的星系更缺乏。但是，与以前的工作相矛盾，没有发现许多其他单独的群体和集群平均较差。在HI光谱不对称方面，我们没有恢复其他星系样品与环境密度增加不对称性的显着趋势。我们还研究了HI不对称和缺乏之间的相关性，但没有发现富含HI，正常或差的星系的平均不对称性变化。这表明不对称不对称对HI缺乏症没有依赖性，或者Galaxy的HI缺乏对所测量的HI不对称性的影响很小，而我们仅使用集成光谱就无法观察到。
We present an analysis of the sky distribution of neutral hydrogen (HI) deficiency and spectral asymmetry for galaxies detected by the HI Parkes All-Sky Survey (HIPASS) as a function of projected environment density. Previous studies of galaxy HI deficiency using HIPASS were sensitive to galaxies that are extremely HI rich or poor. We use an updated binning statistic for measuring the global sky distribution of HI deficiency that is sensitive to the average deficiencies. Our analysis confirms the result from previous studies that galaxies residing in denser environments, such as Virgo, are on average more HI deficient than galaxies at lower densities. However, many other individual groups and clusters are not found to be on average significantly HI poor, in contradiction to previous work. In terms of HI spectral asymmetries, we do not recover any significant trend of increasing asymmetry with environment density as found for other galaxy samples. We also investigate the correlation between HI asymmetry and deficiency, but find no variation in the mean asymmetry of galaxies that are HI rich, normal or poor. This indicates that there is either no dependence of asymmetry on HI deficiency, or a galaxy's HI deficiency only has a small influence on the measured HI asymmetry that we are unable to observe using only integrated spectra.
