论文标题
星系色平面中中性氢的分布
The Distribution of Neutral Hydrogen in the Color-Magnitude Plane of Galaxies
论文作者
论文摘要
我们介绍条件HI（中性氢）质量功能（HIMF），以观察到的光学特性为条件，$ m _ {\ text {r}} $（$ r $ - band band绝对幅度）和$ c _ {\ c _ {\ text {ur pext {ur pext {ur pext {ur pext {ur pext {ur pext {ur pext} $（$ r-r $ color），用于7709个$ $ $ $ $ $ $ $ $ $ $ $ lffalfa的样本 - SDSS DR7中的常见卷。基于有条件的HIMF，我们发现发光的红色，发光的蓝色和微弱的蓝色种群分别在高质量端，膝盖和低质量末端占据了总himf。我们使用有条件的HIMF来得出$ω_ {\ text {hi}} $（hi密度参数），$ p（ω_ {\ text {hi}}）$的基础分布函数，在星系的色平面中。分布，$ p（ω_ {\ text {hi}}）$，在蓝色云中达到$ m _ {\ text {r}}}^{\ text {\ text {max}} = $ -19.25，c _ {它的尾巴很长，朝着微弱的蓝色星系和发光的红色星系。我们认为$ p（ω_ {\ text {hi}}）$可用于以公正的方式揭示冷气，恒星质量和恒星形成率（SFR）之间的基本关系；那就是派生的关系不会受到调查或样本选择的影响。
We present the conditional HI (neutral hydrogen) Mass Function (HIMF) conditioned on observed optical properties, $M_{\text{r}}$ ($r$-band absolute magnitude) and $C_{\text{ur}}$ ($u-r$ color), for a sample of 7709 galaxies from ALFALFA (40% data release - $α.40$) which overlaps with a common volume in SDSS DR7. Based on the conditional HIMF we find that the luminous red, luminous blue and faint blue populations dominate the total HIMF at the high-mass end, knee and the low-mass end respectively. We use the conditional HIMF to derive the underlying distribution function of $Ω_{\text{HI}}$ (HI density parameter), $p(Ω_{\text{HI}})$, in the color-magnitude plane of galaxies. The distribution, $p(Ω_{\text{HI}})$, peaks in the blue cloud at $M_{\text{r}}^{\text{max}}=$ $-19.25, C_{\text{ur}}^{\text{max}}=1.44$ but is skewed. It has a long tail towards faint blue galaxies and luminous red galaxies. We argue that $p(Ω_{\text{HI}})$ can be used to reveal the underlying relation between cold gas, stellar mass and the star formation rate (SFR) in an unbiased way; that is the derived relation does not suffer from survey or sample selection.
