Evidence of a population of dark subhaloes from Gaia and Pan-STARRS observations of the GD-1 stream

被引:58
作者
Banik, Nilanjan [1 ,2 ,3 ,4 ]
Bovy, Jo [5 ]
Bertone, Gianfranco [2 ,3 ]
Erkal, Denis [6 ]
de Boer, T. J. L. [7 ]
机构
[1] Texas A&M Univ, Mitchell Inst Fundamental Phys & Astron, Dept Phys & Astron, College Stn, TX 77843 USA
[2] Univ Amsterdam, GRAPPA Inst, Inst Theoret Phys Amsterdam, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands
[3] Univ Amsterdam, Delta Inst Theoret Phys, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands
[4] Leiden Univ, Lorentz Inst, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands
[5] Univ Toronto, Dept Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada
[6] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England
[7] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
基金
加拿大自然科学与工程研究理事会;
关键词
Galaxy: evolution; Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: structure; cosmology: darkmatter; STELLAR STREAM; MOLECULAR CLOUDS; MATTER; MILKY; GAPS; PERTURBATIONS; DYNAMICS; NUMBER; LENGTH; HALO;
D O I
10.1093/mnras/stab210
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
New data from the Gaia satellite, when combined with accurate photometry from the Pan-STARRS survey, allow us to accurately estimate the properties of the GD-1 stream. Here, we analyse the stellar density variations in the GD-1 stream and show that they cannot be due to known baryonic structures such as giant molecular clouds, globular clusters, or the Milky Way's bar or spiral arms. A joint analysis of the GD-1 and Pal 5 streams instead requires a population of dark substructures with masses approximate to 10(7)-10(9) M-circle dot. We infer a total abundance of dark subhaloes normalized to standard cold dark matter n(sub)/n(sub,CDM) = 0.4(-0.2)(+0.3) (68 per cent), which corresponds to a mass fraction contained in the subhaloes f(sub) = 0.14-(+0.11)(0.07) per cent, compatible with the predictions of hydrodynamical simulation of cold dark matter with baryons.
引用
收藏
页码:2364 / 2380
页数:17
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