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Lu, BQ; Wu, YL; Zhang, WH; Zhou, YF
Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Language英语
KeywordMILKY-WAY COSMOLOGICAL SIMULATIONS OBSERVATIONAL EVIDENCE GALACTIC-CENTER MASSES HALO CANDIDATES SIGNATURE SIGNALS LIMITS
AbstractThe substructures of the Galactic dark matter halo such as dark matter subhalos and dwarf galaxies have very low velocity dispersions, which makes them useful in constraining the scenario of Sommerfeld-enhanced dark matter annihilation. We calculate the velocity distribution of dark matter particles in the dark matter halo substructures using the Eddington's formula with NFW density profile. We parameterize the effect of Sommerfeld enhancement of s-wave dark matter annihilation on the gammaray flux as the Sommerfeld-enhanced J-factors, and explicitly calculate their values for 15 known dwarf spheroidal galaxies. Using the results from the analysis of the unassociated pointsources in the Fermi-LAT 3FGL and Fermi-LAT gammaray data observation on the 15 dwarf galaxies, we derive upper limits on the dark matter annihilation cross sections with Sommerfeld enhancement. We find that in a wide region of parameter space, the constraints can be a few orders of magnitude more stringent than that in the case without the Sommerfeld enhancement. For dark matter annihilation dominantly into e(+)e(-), mu(+)mu(-), tau(+)tau(-) and b (b) over bar, those constraints can exclude thermal relic dark matter for the dark matter mass below about 1 TeV.
2018
ISSN1475-7516
Issue4Pages:35
Subject AreaAstronomy & Astrophysics ; Physics
MOST Discipline CatalogueAstronomy & Astrophysics ; Physics, Particles & Fields
DOI10.1088/1475-7516/2018/04/035
Indexed BySCIE
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/22929
CollectionSCI期刊论文
Affiliation1.[Lu, Bo-Qiang
2.Wu, Yue-Liang
3.Zhang, Wei-Hong
4.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
5.[Wu, Yue-Liang
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Lu, BQ,Wu, YL,Zhang, WH,et al. Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2018(4):35.
APA Lu, BQ,Wu, YL,Zhang, WH,&Zhou, YF.(2018).Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(4),35.
MLA Lu, BQ,et al."Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .4(2018):35.
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