论文标题
$ z \ simeq 4.5 $的快速旋转和低扰动光盘：将其演变成局部早期型星系的动态证据
Fast rotating and low-turbulence discs at $z\simeq 4.5$: Dynamical evidence of their evolution into local early-type galaxies
论文作者
论文摘要
据估计，早期宇宙中的大量星状星系的耗尽时间为$ \ sim 100 $ MYR，因此能够很快将其气体转化为恒星，可能会导致恒星形成的迅速淬火。由于这些原因，它们被认为是大型早期型星系（ETG）的祖细胞。在本文中，我们研究了两个高点$ z $ starbursts，aztec/c159（$ z \ simeq 4.57 $）和j1000+0234（$ z \ simeq 4.54 $），在[CII] 158- $μ$ M $ M发射线中观察到Alma。这些观察结果揭示了两个大规模且经常旋转的气态盘。这些光盘的3D建模返回旋转速度约为$ 500 $ km/s和气体速度分散，低至$ \ $ \ 20 $ km/s，导致常规运动和随机运动之间的比率很高（$ v/σ{\ lower.7ex \ hbox \ hbox \ hbox {$ \ \ \ \ \ \ \ \ \ \ \ \ \ stackrel and sim ^ sim}}}}}}}}}}}}}}}}}}}}}}}}}}}} 20 $），至少在阿兹台克/C159中。旋转曲线的质量分解表明，这两个星系都被高度baryon的气体质量为$ \ 10^{11} M _ {\ odot} $，对于J1000+0234而言，其大于先前的估计值。我们表明，一旦恒星质量的Tully-Fisher关系，这些高$ z $星系与$ z = 0 $ z = 0 $ s = 0 $ sublagive eTG重叠。尽管从快速旋转到几乎压力支持的系统的转换机制仍然不清楚，但这提供了大量高$ z $ starbursts和ETG之间联系的动态证据。
Massive starburst galaxies in the early Universe are estimated to have depletion times of $\sim 100$ Myr and thus be able to convert their gas very quickly into stars, possibly leading to a rapid quenching of their star formation. For these reasons, they are considered progenitors of massive early-type galaxies (ETGs). In this paper, we study two high-$z$ starbursts, AzTEC/C159 ($z\simeq 4.57$) and J1000+0234 ($z\simeq 4.54$), observed with ALMA in the [CII] 158-$μ$m emission line. These observations reveal two massive and regularly rotating gaseous discs. A 3D modelling of these discs returns rotation velocities of about $500$ km/s and gas velocity dispersions as low as $\approx 20$ km/s, leading to very high ratios between regular and random motion ($V/σ{\lower.7ex\hbox{$\;\stackrel{\textstyle>}{\sim}\;$}} 20$), at least in AzTEC/C159. The mass decompositions of the rotation curves show that both galaxies are highly baryon-dominated with gas masses of $\approx 10^{11}M_{\odot}$, which, for J1000+0234, is significantly higher than previous estimates. We show that these high-$z$ galaxies overlap with $z=0$ massive ETGs in the ETG analogue of the stellar-mass Tully-Fisher relation once their gas is converted into stars. This provides dynamical evidence of the connection between massive high-$z$ starbursts and ETGs, although the transformation mechanism from fast rotating to nearly pressure-supported systems remains unclear.
