Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies

doi:10.1088/1475-7516/2018/04/035

ITP OpenIR > 理论物理所科研产出 > SCI论文

	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 Publication	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Language	英语
Keyword	MILKY-WAY COSMOLOGICAL SIMULATIONS OBSERVATIONAL EVIDENCE GALACTIC-CENTER MASSES HALO CANDIDATES SIGNATURE SIGNALS LIMITS
Abstract	The 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
ISSN	1475-7516
Issue	4 Pages:35
Subject Area	Astronomy & Astrophysics ; Physics
MOST Discipline Catalogue	Astronomy & Astrophysics ; Physics, Particles & Fields
DOI	10.1088/1475-7516/2018/04/035
Indexed By	SCIE
Citation statistics	Cited Times:3[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.itp.ac.cn/handle/311006/22929
Collection	理论物理所科研产出_SCI论文
Affiliation	1.[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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