What drives galaxy quenching? A deep connection between galaxy kinematics and quenching in the local Universe
What drives galaxy quenching? A deep connection between galaxy kinematics and quenching in the local Universe
复制标题
是什么驱动星系猝灭？
DOI：
10.1093/mnras/stab3749
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
G. Jones
中科院分区：
文献类型：
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作者：
Simcha Brownson;A. Bluck;R. Maiolino;G. Jones
我们开发了一个2D倾斜旋转盘模型，我们适用于从MANGA调查（SDSS公共数据发布15）1862星系的恒星速度图。我们使用一个随机森林分类器，以确定最连接到星系淬火的运动学参数。我们发现，主要涉及到光盘的运动学参数（如平均旋转速度）和参数，无论是一个星系是rotationor dispersion-dominated（如旋转速度的比率速度色散）是没有根本联系到淬火的星星形成。相反，我们压倒性地发现，这是绝对水平的速度色散（一个属性，主要涉及到星系的隆起/球状组成部分），是最重要的分离星星形成和淬火星系。此外，偏相关分析表明，许多通常讨论的星系性质和淬火之间的相关性是虚假的，和淬火和速度色散之间的基本相关性。特别是，我们发现，在固定的速度色散，只有一个非常弱的依赖淬火盘属性，从而更多的盘状星系更有可能形成恒星。通过调用黑洞质量和速度色散之间的紧密关系，并注意到黑洞质量的痕迹AGN释放的总能量，我们认为，这些数据支持的情况下，淬火发生预防性反馈AGN。这项工作的运动学测量是公开的。
We develop a 2D inclined rotating disc model, which we apply to the stellar velocity maps of 1862 galaxies taken from the MaNGA survey (SDSS public Data Release 15). We use a random forest classifier to identify the kinematic parameters that are most connected to galaxy quenching. We find that kinematic parameters that relate predominantly to the disc (such as the mean rotational velocity) and parameters that characterise whether a galaxy is rotationor dispersion-dominated (such as the ratio of rotational velocity to velocity dispersion) are not fundamentally linked to the quenching of star formation. Instead, we find overwhelmingly that it is the absolute level of velocity dispersion (a property that relates primarily to a galaxy’s bulge/spheroidal component) that is most important for separating star forming and quenched galaxies. Furthermore, a partial correlation analysis shows that many commonly discussed correlations between galaxy properties and quenching are spurious, and that the fundamental correlation is between quenching and velocity dispersion. In particular, we find that at fixed velocity dispersion, there is only a very weak dependence of quenching on the disc properties, whereby more discy galaxies are slightly more likely to be forming stars. By invoking the tight relationship between black hole mass and velocity dispersion, and noting that black hole mass traces the total energy released by AGN, we argue that these data support a scenario in which quenching occurs by preventive feedback from AGN. The kinematic measurements from this work are publicly available.