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arXiv 2009.10083astro-ph.GA
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SDSS MaNGA星系总质量与可见质量之比对可观测性质的依赖性

Dependence of the ratio of total to visible mass on observable properties of SDSS MaNGA galaxies

Kelly A. Douglass, Regina Demina

摘要:

利用SDSS MaNGA DR 15的光谱观测资料,研究了总质量与可见光质量之比与表征星系演化和环境的各种参数之间的关系。通过测量旋转曲线和穿过星系表面的H-α发射线的相对速度,我们估计了每个星系的总质量。我们开发了一个统计模型来描述观测到的分布在总可见质量的比例,从中我们提取一个星系的最可能的值,这个质量比。我们提出了总质量与可见质量的比值与描述星系演化的几个特征之间的关系,如光度,气相金属丰度,到最近邻的距离,以及在色星等图上的位置。我们发现,微弱的星系与低金属,通常在蓝色的云,有最高的比例总可见质量。那些总质量与可见质量之比第二高的星系是最亮的,金属丰度高,通常是红色序列或绿色山谷的成员。活动星系核活动很可能既是猝灭机制,也是推动这些大质量星系质量比更高的反馈。最后,我们介绍了一个参数化,预测一个星系的总可见光质量的比例的基础上,它的测光和光度。

英文摘要:

Using spectroscopic observations from the SDSS MaNGA DR15, we study the relationships between the ratio of total to visible mass and various parameters characterizing the evolution and environment of the galaxies in this survey. Measuring the rotation curve with the relative velocities of the H-alpha emission line across the galaxy's surface, we estimate each galaxy's total mass. We develop a statistical model to describe the observed distribution in the ratio of total to visible mass, from which we extract a galaxy's most probable value for this mass ratio. We present the relationships between the ratio of total to visible mass and several characteristics describing galactic evolution, such as luminosity, gas-phase metallicity, distance to the nearest neighbor, and position on the color-magnitude diagram. We find that faint galaxies with low metallicities, typically in the blue cloud, have the highest ratios of total to visible mass. Those galaxies that exhibit the second highest ratios of total to visible mass are the brightest with high metallicities, typically members of the red sequence or green valley. AGN activity is likely both the quenching mechanism and the feedback that drives the mass ratio higher in these massive galaxies. Finally, we introduce a parametrization that predicts a galaxy's ratio of total to visible mass based on its photometry and luminosity.

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