论文标题

双变量燃气质量分布以及早期和晚期星系的质量功能在$ z \ sim0 $

The bivariate gas-stellar mass distributions and the mass functions of early- and late-type galaxies at $z\sim0$

论文作者

Rodriguez-Puebla, Aldo, Calette, A. R., Avila-Reese, Vladimir, Rodriguez-Gomez, Vicente, Huertas-Company, Marc

论文摘要

我们报告了本地星系的双变量Hi-和h $ _2 $ - 星质量分布,除了银河质量功能,MFS的清单,用于HI,H $ _2 $,冷气和Baryonic Mass,分别为早期和晚期的星系。使用HI和H $ _2 $条件分布和Galaxy Stellar质量功能GSMF确定MFS。对于条件分布,我们使用Calette等人中提出的汇编。 2018年。用于从$ M _ {\ ast} \ sim3 \ times10^{7} $确定GSMF至$ 3 \ times10^{12} $ $ $ M _ {\ odot} $,我们将来自SDSS的两个光泽性样品从SDSS中的两个SDSS组合在一起。我们发现,从表面亮度不完整校正后,GSMF的低质量末端斜率为$α\ 1.4 $,与先前的确定一致。获得的HI MFS同意无线电盲目调查。同样,H $ _2 $ MFS与CO随访的光学选择样品一致。我们估计由于质量与光比的影响,系统学的影响,发现我们的MFS在系统的错误方面具有牢固的影响。我们将MF从随机误差中解析以获得内在的MF。使用MFS,我们计算所有重型分量的宇宙密度参数。锁定在星系中的Baryons代表了通用BARYON含量的5.4%,而$ \ sim96 $的hi和h $ _2 $ smose内的星系中的质量居住在晚期型形态中。我们的结果意味着分别为$ _2 $ h $ _2 $的宇宙耗尽时间和$ \ sim 1.3 $和7.2 GYR的近期星系中的总中性h,这表明晚期类型的星系平均效率低下,将H $ _2 $转化为h $ _2 $,并将HI h hi GAS转化为h $ _2 $ _2 $。我们的结果提供了关于双变量气体 - 恒星质量分布及其预测MFS的星系人口统计学的完全自洽的经验描述。此描述是比较和/或约束星系形成模型的理想选择。

We report the bivariate HI- and H$_2$-stellar mass distributions of local galaxies in addition of an inventory of galaxy mass functions, MFs, for HI, H$_2$, cold gas, and baryonic mass, separately into early- and late-type galaxies. The MFs are determined using the HI and H$_2$ conditional distributions and the galaxy stellar mass function, GSMF. For the conditional distributions we use the compilation presented in Calette et al. 2018. For determining the GSMF from $M_{\ast}\sim3\times10^{7}$ to $3\times10^{12}$ $M_{\odot}$, we combine two spectroscopic samples from the SDSS at the redshift range $0.0033<z<0.2$. We find that the low-mass end slope of the GSMF, after correcting from surface brightness incompleteness, is $α\approx-1.4$, consistent with previous determinations. The obtained HI MFs agree with radio blind surveys. Similarly, the H$_2$ MFs are consistent with CO follow-up optically-selected samples. We estimate the impact of systematics due to mass-to-light ratios and find that our MFs are robust against systematic errors. We deconvolve our MFs from random errors to obtain the intrinsic MFs. Using the MFs, we calculate cosmic density parameters of all the baryonic components. Baryons locked inside galaxies represent 5.4% of the universal baryon content, while $\sim96$% of the HI and H$_2$ mass inside galaxies reside in late-type morphologies. Our results imply cosmic depletion times of H$_2$ and total neutral H in late-type galaxies of $\sim 1.3$ and 7.2 Gyr, respectively, which shows that late type galaxies are on average inefficient in converting H$_2$ into stars and in transforming HI gas into H$_2$. Our results provide a fully self-consistent empirical description of galaxy demographics in terms of the bivariate gas--stellar mass distribution and their projections, the MFs. This description is ideal to compare and/or to constrain galaxy formation models.

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