Clues to the nature of ultradiffuse galaxies from estimated galaxy velocity dispersions

被引：40

作者：

Zaritsky, Dennis ^{[1
]}

机构：

[1] Univ Arizona, Steward Observ, Tucson, AZ 85719 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 464卷 / 01期

基金：

美国国家科学基金会;

关键词：

galaxies: evolution; galaxies: fundamental parameters; galaxies: kinematics and dynamics; INITIAL MASS FUNCTIONS; DARK ENERGY SURVEY; MILKY-WAY; ELLIPTIC GALAXIES; GLOBULAR-CLUSTERS; COLD;

D O I：

10.1093/mnrasl/slw198

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe how to estimate the velocity dispersions of ultradiffuse galaxies (UDGs) using a previously defined galaxy scaling relationship. The method is accurate for the two UDGs with spectroscopically measured dispersions, as well as for ultracompact galaxies, ultrafaint galaxies, and stellar systems with little or no dark matter. This universality means that the relationship can be applied without further knowledge or prejudice regarding the structure of a galaxy. We then estimate the velocity dispersions of UDGs drawn from two published samples and examine the distribution of total masses. We find, in agreement with the previous studies of two individual UDGs, that these systems are dark matter dominated systems, and that they span a range of at least 10(10) < M-200/M-circle dot < 10(12). These galaxies are not, as an entire class, either all dwarfs or all failed L-* galaxies. Estimates of the velocity dispersions can also help identify interesting subsets of UDGs, such as those that are likely to have the largest mass-to-light ratios, for subsequent spectroscopic study.

引用

页码：L110 / L113

页数：4

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