期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 485, 期 1, 页码 382-395出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz383
关键词
galaxies: formation; galaxies: evolution; galaxies: dwarf; galaxies: haloes; galaxies: clusters: general; galaxies: kinematics and dynamics
资金
- NSF [AST-1518257, PHY-1620638]
- NASA [NAS 5-26555]
- Space Telescope Science Institute
- STFC [ST/R000972/1] Funding Source: UKRI
We propose that the ultra-diffuse galaxy (UDG) population represents a set of satellite galaxies born in similar to 10(10)-10(11)M(circle dot) haloes, similar to field dwarfs, which suffer a dramatic reduction in surface brightness due to tidal stripping and heating. This scenario is observationally motivated by the radial alignment of UDGs in Coma as well as the significant dependence of UDG abundance on cluster mass. As a test of this formation scenario, we apply a semi-analytic model describing the change in stellar mass and half-light radius of dwarf satellites, occupying either cored or cuspy haloes, to cluster subhaloes in the Illustris-dark simulation. Key to this model is results from simulations that indicate that galaxies in cored dark matter haloes expand significantly in response to tidal stripping and heating, whereas galaxies in cuspy haloes experience limited size evolution. Our analysis indicates that a population of tidally stripped dwarf galaxies, residing in cored haloes (such as those hosting low surface brightness field dwarfs), is able to reproduce the observed sizes and stellar masses of UDGs in clusters remarkably well.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据