论文标题
三大龙：明亮的Lyman-Break Galaxy中的分子气，$ Z = 7.15 $
Big Three Dragons: Molecular Gas in a Bright Lyman-Break Galaxy at $z=7.15$
论文作者
论文摘要
我们报告了B14-65666中的Co（6-5），Co（7-6）和[CI]（2-1）的Alma Band 3观察结果（````三大龙'''）是最明亮的Lyman-preak Galaxies之一，$ Z> 7 $之一是$ z> 7 $的静止式contraum，frame contrumaviolet Contrumaviolet Contionuum，far-Infrared Contrunuum $ $ $ $ $ $ $ MORISIS和$ ISSISISION和88 oi IN [88 [CII] 158 $μ$ m。 CO（6-5），CO（7-6）和[CI]（2-1），其发光性上的$3σ$上限大约是[CII]光度的40倍，但未检测到。 $ l _ {\ rm [cii]} $/$ l _ {\ rm co（6-5）} $和$ l _ {\ rm [cii]} $/$ l _ {\ rm _ {\ rm co（7-6）} $比以类似的dust y Mouth and to dusty tody hith ost and of dusty tody topery and quas and quas and quas and quas and quas and quas and quas and quas and quas and quas，提示在B14-65666中光解散区域中的气体密度较低。通过使用（1）[CII]亮度，（2）尘埃质量与气体质量比，（3）一个动态的质量估计，我们发现分子气体质量（$ M _ {\ rm {mol {mol {mol}} $）为$（0.05-11）该值与Mid-J $ CO和[CI]（2-1）的非探测所推断的上限一致。尽管在$ M _ {\ rm mol} $中有很大的不含量，但我们估计一个分子气体与固定的质量比（$μ__ {\ rm {gas}} $ $ 0.65-140 $，气体消耗时间和$ 2.5-550 $ 2.5550;这些值与其他高红色星系的值一致。 B14-65666如果没有从银河系以外的气体加油，则可以是$ z \ gtrsim4 $的被动星系的祖先。
We report ALMA Band 3 observations of CO(6-5), CO(7-6), and [CI](2-1) in B14-65666 (``Big Three Dragons''), one of the brightest Lyman-Break Galaxies at $z>7$ in the rest-frame ultraviolet continuum, far-infrared continuum, and emission lines of [OIII] 88 $μ$m and [CII] 158 $μ$m. CO(6-5), CO(7-6), and [CI](2-1), whose $3σ$ upper limits on the luminosities are approximately 40 times fainter than the [CII] luminosity, are all not detected. The $L_{\rm [CII]}$/$L_{\rm CO(6-5)}$ and $L_{\rm [CII]}$/$L_{\rm CO(7-6)}$ ratios are higher than the typical ratios obtained in dusty star-forming galaxies or quasar host galaxies at similar redshifts, and they may suggest a lower gas density in the photodissociated region in B14-65666. By using the (1) [CII] luminosity, (2) dust mass-to-gas mass ratio, and (3) a dynamical mass estimate, we find that the molecular gas mass ($M_{\rm{mol}}$) is $(0.05-11)\times10^{10}$ $M_{\rm \odot}$. This value is consistent with the upper limit inferred from the nondetection of mid-$J$ CO and [CI](2-1). Despite the large uncertauinty in $M_{\rm mol}$, we estimate a molecular gas-to-stellar mass ratio ($μ_{\rm{gas}}$) of $0.65-140$ and a gas depletion time ($τ_{\rm dep}$) of $2.5-550$ Myr; these values are broadly consistent with those of other high-redshift galaxies. B14-65666 could be an ancestor of a passive galaxy at $z\gtrsim4$ if no gas is fueled from outside the galaxy.
