LVHIS、VIVA和HALOGAS半导体中的HI不对称性
HI Asymmetries in LVHIS, VIVA and HALOGAS Galaxies
摘要：
我们提出了一个分析的形态，运动学和光谱不对称性的观察原子中性氢（HI）气体从本地体积HI调查（LVHIS），VLA成像的室女座原子气体（VIVA）调查和氢吸积在本地星系调查（HALOGAS）。为了调查当地环境密度和恒星质量对未来大型HI调查中测得的HI不对称性的影响，我们为未来分析中使用的最有意义的不对称性措施提供了建议。控制恒星质量后，我们发现的迹象，统计上显着的趋势，增加局部密度的不对称性。我们测量的最显著的趋势是归一化翻转光谱残差（$A_{\mathrm{spec}}$），$0.204\pm0.011$和$0.615\pm0.068$的平均LVHIS和VIVA值分别在平均加权$10^{\mathrm{th}}$最近邻星系数密度为$\log(ρ_{10}/\mathrm{Mpc}^{-3})=-1.64$和0.88时。展望澳大利亚平方公里阵列探路者（ASKAP）的WALLABY调查，我们估计，探测的数量将足以提供覆盖超过5个数量级的局部密度和恒星质量增加的动态范围和精度，我们可以探测这些属性的影响在星系中原子气体的分布不对称。
英文摘要：
We present an analysis of morphological, kinematic and spectral asymmetries in observations of atomic neutral hydrogen (HI) gas from the Local Volume HI Survey (LVHIS), the VLA Imaging of Virgo in Atomic Gas (VIVA) survey and the Hydrogen Accretion in Local Galaxies Survey (HALOGAS). With the aim of investigating the impact of the local environment density and stellar mass on the measured HI asymmetries in future large HI surveys, we provide recommendations for the most meaningful measures of asymmetry for use in future analysis. After controlling for stellar mass, we find signs of statistically significant trends of increasing asymmetries with local density. The most significant trend we measure is for the normalised flipped spectrum residual ($A_{\mathrm{spec}}$), with mean LVHIS and VIVA values of $0.204\pm0.011$ and $0.615\pm0.068$ at average weighted $10^{\mathrm{th}}$ nearest-neighbour galaxy number densities of $\log(ρ_{10}/\mathrm{Mpc}^{-3})=-1.64$ and 0.88, respectively. Looking ahead to the WALLABY survey on the Australian Square Kilometre Array Pathfinder (ASKAP), we estimate that the number of detections will be sufficient to provide coverage over 5 orders of magnitude in both local density and stellar mass increasing the dynamic range and accuracy with which we can probe the effect of these properties on the asymmetry in the distribution of atomic gas in galaxies.
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