论文标题
在$ z \ 2 $的吸收选择星系中的高分子气体质量
High Molecular Gas Masses in Absorption-selected Galaxies at $z \approx 2$
论文作者
论文摘要
我们已经使用了Atacama大毫米/亚毫米阵列（ALMA）来搜索CO（3 $ - $ 2）或（4 $ - $ 3）从12个高金属金属（[m/h]〜$ \ geq -0.72 $ \，dex）damped lyman-$ a $α$ a $ a $ a z $ z的田地（[M/H]我们检测到来自五个DLA的星系中的星系发射（其中两个已报道），获得了高分子气体质量，$ \ rm m_ {mol} \ of（1.3-20.7）\ times（α__ {\ rm co} /4.36/4.36）\ times 10^{10^{10} {10}} \;; m_ \ odot $。 CO发射到QSO视线的影响参数位于$ B \ 5.6-100 $ 〜kpc的范围内，其中三个新的CO检测具有$ B \ Lessim 15 $ 〜kpc。最高的CO线亮度和推断的分子气体质量与最高金属性DLA有关，[M/H]〜$ \ GTRSIM -0.3 $ \，DEX。恒星质量金属关系和高红移星系中高分子气体质量比的组合可以解释高推断的分子气体质量。通过我们的CO搜索确定的DLA星系具有与发射选择样品的属性。在较早的光学或近红外搜索中，在CO排放中检测到的DLA星系均未鉴定出来，反之亦然。在CO发射中未检测到在光学/接近IR搜索中鉴定出的DLA星系。高级Alma Co和c [{\ sc ii}] 〜158 $ $ $ $ m $ $ $ z $，高金属DLA星系彻底改变了该领域，从而可以识别与高$ z $ dlas相关的尘土飞扬，巨大的星系。 H {\ sc i} - 吸收标准识别DLAS在广泛的环境中选择了整个高$ z $星系人群，包括尘土和紫外线星系。
We have used the Atacama Large Millimeter/submillimeter Array (ALMA) to carry out a search for CO (3$-$2) or (4$-$3) emission from the fields of 12 high-metallicity ([M/H]~$\geq -0.72$\,dex) damped Lyman-$α$ absorbers (DLAs) at $z \approx 1.7-2.6$. We detected CO emission from galaxies in the fields of five DLAs (two of which have been reported earlier), obtaining high molecular gas masses, $\rm M_{mol} \approx (1.3 - 20.7) \times (α_{\rm CO}/4.36) \times 10^{10} \; M_\odot$. The impact parameters of the CO emitters to the QSO sightline lie in the range $b \approx 5.6-100$~kpc, with the three new CO detections having $b \lesssim 15$~kpc. The highest CO line luminosities and inferred molecular gas masses are associated with the highest-metallicity DLAs, with [M/H]~$\gtrsim -0.3$\,dex. The high inferred molecular gas masses may be explained by a combination of a stellar mass-metallicity relation and a high molecular gas-to-stars mass ratio in high-redshift galaxies; the DLA galaxies identified by our CO searches have properties consistent with those of emission-selected samples. None of the DLA galaxies detected in CO emission were identified in earlier optical or near-IR searches and vice-versa; DLA galaxies earlier identified in optical/near-IR searches were not detected in CO emission. The high ALMA CO and C[{\sc ii}]~158$μ$m detection rate in high-$z$, high-metallicity DLA galaxies has revolutionized the field, allowing the identification of dusty, massive galaxies associated with high-$z$ DLAs. The H{\sc i}-absorption criterion identifying DLAs selects the entire high-$z$ galaxy population, including dusty and UV-bright galaxies, in a wide range of environments.
