Ultra-diffuse galaxies without dark matter

被引:49
作者
Silk, Joseph [1 ,2 ,3 ,4 ]
机构
[1] Sorbonne Univ, Inst Astrophys Paris, UPMC Univ Paris 06, UMR 7095, F-75014 Paris, France
[2] CNRS, UMR 7095, F-75014 Paris, France
[3] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[4] Univ Oxford, Beecroft Inst Particle Astrophys & Cosmol, Dept Phys, Oxford OX1 3RH, England
关键词
galaxies: formation; cosmology: theory; dark matter; GLOBULAR-CLUSTERS; STAR-CLUSTERS; GAS; CLOUD; SCALE; FRAGMENTATION; INTERSTELLAR; POPULATION; MASS;
D O I
10.1093/mnrasl/slz090
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
I develop a high-velocity galaxy collision model to explain a rare but puzzling phenomenon, namely the apparent existence of ultra-diffuse galaxies with little dark matter. Predictions include simultaneous triggering of overpressured dense clouds to form luminous old globular clusters, a protogroup environment to generate high relative velocities of the initially gas-rich galaxies in the early universe, and spatially separated dark haloes, possibly detectable via gravitational lensing and containing relic low-metallicity stars with enhanced alpha/Fe at ultra-low surface brightness.
引用
收藏
页码:L24 / L28
页数:5
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