MUSE-ALMA Haloes XI: gas flows in the circumgalactic medium
MUSE-ALMA Haloes XI: gas flows in the circumgalactic medium
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MUSE-ALMA Haloes XI：环绕银河系介质中的气体流动
DOI：
10.1093/mnras/stad1462
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发表时间：
2023
影响因子：
4.8
通讯作者：
Hayes, Matthew J.
中科院分区：
文献类型：
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作者：
Weng, Simon;Péroux, Céline;Karki, Arjun;Augustin, Ramona;Kulkarni, Varsha P.;Hamanowicz, Aleksandra;Zwaan, Martin;Sadler, Elaine M.;Nelson, Dylan;Hayes, Matthew J.
进出星系的气体流在环星系介质中留下痕迹，然后可以使用背景类星体的吸收线进行研究。我们分析了MUSE-ALMA Haloes调查中的27 ${{\log [N（{\textrm {H}}\，{\small {I}}）/\rm {cm}^{-2}]}} > 18.0$ Hiabsorbers atz= 0.2至1.4，其中至少有一个星系对应物的视线速度为±500 km s-1。我们进行三维运动学正演模拟这些相关的星系研究流动的致密，中性气体在环星系介质。从VLT/MUSE，HST宽带成像，VLT/UVES和Keck/HIRES高分辨率紫外类星体光谱观测，我们比较的影响参数，恒星形成率，恒星质量的相关星系的吸收体属性。我们发现边缘的证据双峰分布的方位角强Hiabsorbers，类似于以前的研究的Mgii和Ovi吸收线。有没有明确的金属丰度依赖于方位角，我们建议一个更大的样本的吸收体，需要充分测试宇宙流体动力学模拟预测的关系。对吸收器的个案研究表明，10%的吸收器与气体吸积一致，高达30%的微量流出，其余的微量气体在星系盘，群内介质和低质量星系中低于MUSE检测限。我们的研究结果强调了重子循环直接影响恒星形成所需的致密中性气体，并在星系演化中起着关键作用。
The flow of gas into and out of galaxies leaves traces in the circumgalactic medium which can then be studied using absorption lines towards background quasars. We analyse 27 ${{\log [N({\textrm {H}}\, {\small {I}})/\rm {cm}^{-2}]}} > 18.0$ Hiabsorbers atz= 0.2 to 1.4 from the MUSE-ALMA Haloes survey with at least one galaxy counterpart within a line of sight velocity of ±500 km s−1. We perform 3D kinematic forward modelling of these associated galaxies to examine the flow of dense, neutral gas in the circumgalactic medium. From the VLT/MUSE,HSTbroad-band imaging, and VLT/UVES and Keck/HIRES high-resolution UV quasar spectroscopy observations, we compare the impact parameters, star-formation rates, and stellar masses of the associated galaxies with the absorber properties. We find marginal evidence for a bimodal distribution in azimuthal angles for strong Hiabsorbers, similar to previous studies of the Mgiiand Oviabsorption lines. There is no clear metallicity dependence on azimuthal angle, and we suggest a larger sample of absorbers is required to fully test the relationship predicted by cosmological hydrodynamical simulations. A case-by-case study of the absorbers reveals that ten per cent of absorbers are consistent with gas accretion, up to 30 per cent trace outflows, and the remainder trace gas in the galaxy disc, the intragroup medium, and low-mass galaxies below the MUSE detection limit. Our results highlight that the baryon cycle directly affects the dense neutral gas required for star-formation and plays a critical role in galaxy evolution.