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首页> 外文期刊>The Astrophysical journal >THE H I CONTENT OF SPIRALS. I. FIELD GALAXY H I MASS FUNCTIONS AND H I MASS-OPTICAL SIZE REGRESSIONS
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THE H I CONTENT OF SPIRALS. I. FIELD GALAXY H I MASS FUNCTIONS AND H I MASS-OPTICAL SIZE REGRESSIONS

机译：螺旋形的内容。 I.现场星系H I质量函数和H I大规模光学回归

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摘要

A standard parametric maximum likelihood technique is used to determine both the probability distribution over total H I mass, M_(H I), and the regression of this quantity on the linear optical diameter, D_o, for field giant spirals (Sa-Sc) from a complete H I flux-limited data set of these objects. This sample is extracted from a subset of the optical magnitude-limited Catalog of Galaxies and Clusters of Galaxies comprised of galaxies observed in the 21 cm H I line and located in the lowest density environments of the Pisces-Perseus supercluster region bounded by 22~h ≤ R.A. ≤ 3~h, 0° ≤ decl. ≤ 40°. Gaussian and Schechter parameterizations of the H I mass function are explored. We find that the available data are equally well described by both models and that the different morphological classes of giant spirals have H I mass functions that, in general, agree well within the errors. The largest discrepancy corresponds to the Sb-type systems that exhibit a deficit of low H I-mass objects relative to the other types. Using a straightforward generalization of the Gaussian model, we have also investigated the linear dependence of M_(H I) on D_o. We confirm that the H I content of spirals is much better predicted by the size of their optical disks than by their morphological types alone. The inferred correlations imply a considerable decrease of the ratio M_(H I)/D_o~2 with increasing galaxy size for types earlier than Sc.
机译：使用标准的参数最大似然技术来确定整个HI质量的概率分布M_（HI），以及从一个完整的场大螺旋（Sa-Sc）来看，该量对线性光学直径D_o的回归这些对象的HI通量限制数据集。该样本是从光学量级受限的星系和星系团的子集中提取的，该星系由在21 cm HI线中观测到并位于以22〜h≤为界的双鱼座-英仙座超集群区域的最低密度环境中组成。 RA ≤3〜h，0°≤纬度≤40°。探索了H I质量函数的高斯和Schechter参数化。我们发现，两个模型均能很好地描述可用数据，并且巨型螺旋线的不同形态类别具有H I质量函数，通常在误差范围内吻合良好。最大差异对应于Sb型系统，相对于其他类型，Sb型系统显示出低H I质量物体的不足。使用高斯模型的直接概括，我们还研究了M_（HI）对D_o的线性依赖性。我们证实，通过螺旋光盘的大小，可以比通过单独的形态类型更好地预测螺旋的H I含量。对于早于Sc的类型，推断的相关性意味着随着银河大小的增加，比率M_（H I）/ D_o〜2会大大降低。

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