Resolved galactic superwinds reconstructed around their host galaxies at z > 3

Resolved galactic superwinds reconstructed around their host galaxies at z > 3
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在 z > 3 的宿主星系周围重建了已解决的银河超级风

DOI:
10.1093/mnras/stab1041
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发表时间:
2021
影响因子:
4.8
通讯作者:
Broadhurst, Tom
Broadhurst, Tom
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chen, Mandy C;Chen, Hsiao-Wen;Gronke, Max;Rauch, Michael;Broadhurst, Tom

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本文详细分析了大质量星系团MACS α1206 0847(z=3.038)在星系z=3.038和z=3.754附近探测到的两个巨型莱曼-阿尔法(Ly−)弧。在深度缪斯观测中发现的Ly α星云呈现出双峰轮廓,其中有一个主要的红峰,指示了膨胀/外流运动。其中一个弧线围绕星系团爱因斯坦半径延伸超过1角分,在kpc尺度上解析出线发射气体的速度场,绕着三个0.3atz=3.038的恒星形成星系。第二个弧形跨度15角秒,大致以两个低质量的Ly α发射体为中心,atz=3.754。除了星云发射线外,z=3.038星系群中的所有三个星系都显示出显著的衰减Ly α吸收(Dla)和几条金属吸收线,如和CIII]λλ1906,1908年。延长的Ly α发射似乎出现在每个星系中心表面亮度受到抑制的恒星形成区域。在Ly α谱线轮廓中观察到了显著的空间变化,当没有考虑到积分谱线时,导致了对基本气体运动学的偏向约束。观测到的空间变化表明,从恒星形成区到低密度晕环境的高密度气体连续流动中存在陡峭的速度梯度。对现有星系光谱的详细检查表明,星系中没有活动星系核活动的证据,观测到的Ly α信号主要是由共振散射解释的。本文介绍的研究表明,空间分辨成像光谱学提供了迄今为止最详细的关于与恒星形成星系相关的星系超风运动学的见解。
This paper presents a detailed analysis of two giant Lyman-alpha (Ly α) arcs detected near galaxies atz= 3.038 andz= 3.754 lensed by the massive cluster MACS 1206−0847 (z= 0.44). The Ly α nebulae revealed in deep MUSE observations exhibit a double-peaked profile with a dominant red peak, indicating expansion/outflowing motions. One of the arcs stretches over 1 arcmin around the cluster Einstein radius, resolving the velocity field of the line-emitting gas on kpc scales around three star-forming galaxies of 0.3–atz= 3.038. The second arc spans 15 arcsec in size, roughly centred around two low-mass Ly α emitters ofatz= 3.754. All three galaxies in thez= 3.038 group exhibit prominent damped Ly α absorption (DLA) and several metal absorption lines, in addition to nebular emission lines such asand Ciii]λλ1906, 1908. Extended Ly α emission appears to emerge from star-forming regions with suppressed surface brightness at the centre of each galaxy. Significant spatial variations in the Ly α line profile are observed which, when unaccounted for in the integrated line, leads to biased constraints for the underlying gas kinematics. The observed spatial variations indicate the presence of a steep velocity gradient in a continuous flow of high column density gas from star-forming regions into a low-density halo environment. A detailed inspection of available galaxy spectra shows no evidence of AGN activity in the galaxies, and the observed Ly α signals are primarily explained by resonant scattering. The study presented in this paper shows that spatially resolved imaging spectroscopy provides the most detailed insights yet into the kinematics of galactic superwinds associated with star-forming galaxies.
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