Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies
文献类型：期刊论文
| 作者 | Zhang, WH; Lu, BQ; Wu, YL ; Zhou, YF
|
| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
 |
| 出版日期 | 2018 |
| 期号 | 4页码:35 |
| 关键词 | MILKY-WAY COSMOLOGICAL SIMULATIONS OBSERVATIONAL EVIDENCE GALACTIC-CENTER MASSES HALO CANDIDATES SIGNATURE SIGNALS LIMITS |
| ISSN号 | 1475-7516 |
| DOI | 10.1088/1475-7516/2018/04/035 |
| 英文摘要 | 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. |
| 学科主题 | Astronomy & Astrophysics ; Physics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/22929]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 作者单位 | 1.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China 2.Zhang, Wei-Hong 3.Wu, Yue-Liang 4.[Wu, Yue-Liang 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.[Lu, Bo-Qiang |
| 推荐引用方式 GB/T 7714 | Zhang, WH,Lu, BQ,Wu, YL,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 | Zhang, WH,Lu, BQ,Wu, YL,&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 | Zhang, WH,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. |
入库方式： OAI收割
来源：理论物理研究所
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