论文标题
XGASS：被动磁盘不会容纳冷原子氢的大型储层
xGASS: passive disks do not host unexpectedly large reservoirs of cold atomic hydrogen
论文作者
论文摘要
我们使用扩展的Galex Arecibo SDSS调查（XGASS）来量化中央磁盘星系的原子氢（HI）储层与当前恒星形成速率（SFR）之间的关系。这主要是由于最近在该样本中的存在的主张，即具有与主要序列星系中观察到的大量储层的大量被动磁盘。 Across the stellar mass range 10$^{9}<$M$_{*}$/M$_{\odot}<$10$^{11}$, we practically find no passive ($\gtrsim$2$σ$ below the star-forming main sequence) disk galaxies with HI reservoirs comparable to those typical of star-forming systems.即使在上限上包括HI不检测，被动磁盘通常也比其主动配料少于$ \ geq $ 0.5 dex。我们表明，先前的主张是由于使用了MPA/JHU SDSS DR7目录中使用了孔径校正的SFR估计值，该目录没有提供具有扩展星形磁盘的HI-RICH GALAXIES全局SFR的公平表示。我们的发现证实，当地宇宙中的大部分被动磁盘种群是贫穷的。这些也意味着，即使在中央磁盘星系中，恒星形成的减少也必须伴随着其HI水库的减少。
We use the extended GALEX Arecibo SDSS Survey (xGASS) to quantify the relationship between atomic hydrogen (HI) reservoir and current star formation rate (SFR) for central disk galaxies. This is primarily motivated by recent claims for the existence, in this sample, of a large population of passive disks harbouring HI reservoirs as large as those observed in main sequence galaxies. Across the stellar mass range 10$^{9}<$M$_{*}$/M$_{\odot}<$10$^{11}$, we practically find no passive ($\gtrsim$2$σ$ below the star-forming main sequence) disk galaxies with HI reservoirs comparable to those typical of star-forming systems. Even including HI non detections at their upper limits, passive disks typically have $\geq$0.5 dex less HI than their active counterparts. We show that previous claims are due to the use of aperture-corrected SFR estimates from the MPA/JHU SDSS DR7 catalog, which do not provide a fair representation of the global SFR of HI-rich galaxies with extended star-forming disks. Our findings confirm that the bulk of the passive disk population in the local Universe is HI-poor. These also imply that the reduction of star formation, even in central disk galaxies, has to be accompanied by a reduction in their HI reservoir.
