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Warm dark matter model with a few keV mass is bad for the too-big-to-fail problem
Kang, Xi1,2
2020
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume491Issue:2Pages:2520-2535
Corresponding AuthorKang, Xi(kangxi@pmo.ac.cn)
AbstractTheoretical studying of the very inner structure of faint satellite galaxy requires very high-resolution hydro-dynamical simulations with realistic model for star formation, which are beginning to emerge recently. In this work, we present an analytical description to model the inner kinematic of satellites in the Milky Way (MW). We use a Monte Carlo method to produce merger trees for MW mass halo and analytical models to produce stellar mass in the satellite galaxies. We consider two important processes which can significantly modify the inner mass distribution in satellite galaxy. The first is baryonic feedback which can induce a flat inner profile depending on the star formation efficiency in the galaxy. The second is the tidal stripping to reduce and re-distribute the mass inside satellite. We apply this model to MW satellite galaxies in both CDM and thermal relic WDM models. It is found that tidal heating must be effective to produce a relatively flat distribution of the satellite circular velocities, to agree with the data. The constraint on WDM mass depends on the host halo mass. For a MW halo with dark matter mass lower than 2 x 10(12) M-circle dot, a 2 keV WDM model can be safely excluded as the predicted satellite circular velocities are systematically lower than the data. For WDM with mass of 3.5 keV, it requires the MW halo mass to be larger than 1.5 x 10(12) M-circle dot.
Keywordmethods: numerical methods: statistical galaxies: dwarf galaxies: evolution Cosmology: dark matter
DOI10.1093/mnras/stz3118
WOS KeywordMILKY-WAY SATELLITES ; GALAXY FORMATION ; DENSITY PROFILES ; LOCAL GROUP ; STATISTICAL PROPERTIES ; LUMINOSITY FUNCTION ; MERGER HISTORIES ; DWARF GALAXIES ; HALO MASS ; COLD
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000512302100072
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/36449
Collection中国科学院紫金山天文台
Corresponding AuthorKang, Xi
Affiliation1.Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Peoples R China
2.Zhejiang Univ, Zhejiang Univ Purple Mt Observ Joint Res Ctr Astr, Hangzhou 310027, Peoples R China
Recommended Citation
GB/T 7714
Kang, Xi. Warm dark matter model with a few keV mass is bad for the too-big-to-fail problem[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,491(2):2520-2535.
APA Kang, Xi.(2020).Warm dark matter model with a few keV mass is bad for the too-big-to-fail problem.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,491(2),2520-2535.
MLA Kang, Xi."Warm dark matter model with a few keV mass is bad for the too-big-to-fail problem".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 491.2(2020):2520-2535.
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