AI 中文总结
该研究利用多种目录及样本，通过非参数方法估计富含气体星系的GSMF，校正选择效应后分析红、蓝群体情况，还得到无选择偏差的\(M_{\rm HI}-M_{\rm star}\)关系，明确了富含气体星系在本地宇宙中恒星质量密度和星系数量的占比。
AI 中文摘要
我们使用100%的ALFALFA（\(\alpha\)）目录估计富含中性氢（HI）气体星系的星系恒星质量函数（GSMF），其中约98%在斯隆数字巡天（SDSS）中有光学对应体，部分在GALEX SDSS WISE遗产目录-2（GSWLC-2）中有对应体。利用结合紫外、光学和红外波段并进行个体尘埃校正的子集质量估计来重新校准光学恒星质量估计。用非参数方法估计这些富含气体星系的GSMF。所得HI选择的GSMF与单一Schechter函数一致，最佳拟合参数为\(\left\{\phi_* (10^{-3}\, h_{70}^{3}\,\mathrm{Mpc}^{-3}\,\mathrm{dex}^{-1}), \log_{10} (M_*/M_{\odot}) + 2\log_{10} h_{70}, \alpha \right\} = \left\{2.30^{+0.12}_{-0.12}, \,10.83^{+0.01}_{-0.01},\, -1.14^{+0.02}_{-0.02}\right\} \)。此外，红、蓝群体各自都能用单一Schechter函数很好地描述。校正选择效应后发现，红群体在数量上仅占富含气体星系的约18%，但贡献了约54%的总恒星质量，蓝群体占其余部分。利用光学选择样本和联合光学-HI样本，我们发现富含气体星系在本地宇宙中占总恒星质量密度的约33%和总星系数量的约39%。我们利用HI选择样本的GSMF和HI质量函数（HIMF）得到无选择偏差的\(M_{\rm HI}-M_{\rm star}\)关系。
英文摘要
We estimate the Galaxy Stellar Mass Function (GSMF) of HI gas-rich galaxies using the 100\% ALFALFA ($α$) catalog, $\sim 98\%$ of which have optical counterparts in the Sloan Digital Sky Survey (SDSS) and a subset of them have counterparts in GALEX SDSS WISE Legacy Catalogue-2(GSWLC-2). We use the mass estimates from this subset which combines UV, optical and IR bands with individual dust corrections to recalibrate optical stellar mass estimates. We use a non-parametric method to estimate the GSMF of these gas-rich galaxies. The resulting, HI-selected GSMF is consistent with a single Schechter function with best-fit parameters $\left\{ϕ_* (10^{-3}\, h_{70}^{3}\,\mathrm{Mpc}^{-3}\,\mathrm{dex}^{-1}), \log_{10} (M_*/M_{\odot}) + 2\log_{10} h_{70}, α\right\} = \left\{2.30^{+0.12}_{-0.12}, \,10.83^{+0.01}_{-0.01},\, -1.14^{+0.02}_{-0.02}\right\} $. Additionally, the red and blue populations are each well described by a single Schechter function. After correcting for selection effects, we find that the red population accounts for only $\sim18\%$ of gas-rich galaxies by number, yet contributes $\sim54\%$ of the total stellar mass, with the blue population accounting for the rest. Using an optically selected sample and a joint optical-HI sample, we find gas-rich galaxies represent $\sim 33\%$ of the total stellar mass density and $\sim 39\%$ of the total galaxy number counts in the local Universe. We use the GSMF and the HI mass function (HIMF) of the HI-selected sample to obtain the $M_{\rm HI}-M_{\rm star}$ relation, which is free from selection bias.
Comments22 pages, 14 figues
