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Dark matter annihilation and non-thermal Sunyaev-Zel'dovich effect: II. Dwarf spheroidal galaxy
Huang, Feng1,2,3; Chen, Xuelei1,4; Yuan, Qiang5,6; Bi, Xiaojun4,5
2010-11-01
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
期号11
摘要We calculate the CMB temperature distortion due to the energetic electrons and positrons produced by dark matter (DM) annihilation (Sunyaev-Zel'dovich effect, SZ(DM)) in dwarf spheroidal galaxies (dSphs). In the calculation we have included two important effects which were previously ignored. First we show that the e(+/-) with energy less than similar to GeV, which were neglected in previous calculation, could contribute a significant fraction of the total signal. Secondly we also consider the full effects of diffusion loss, which could significantly reduce the density of e(+/-) at the center of cuspy halos. For neutralinos, we find that detecting such kind of SZ effect is beyond the capability of the current or even the next generation experiments, which is consistent with the quantitative description made by S. Colafrancesco in [1]. In the case of light dark matter (LDM) the signal is much larger, but even in this case it is only marginally detectable with the next generation of experiment such as ALMA. We conclude that similar to the case of galaxy clusters, in the dwarf galaxies the SZDM effect is not a strong probe of DM annihilations.
关键词Dark Matter Theory Dwarf Galaxies Cosmic Ray Theory Sunyaev-zeldovich Effect
DOI10.1088/1475-7516/2010/11/025
收录类别SCI
语种英语
WOS记录号WOS:000284825100025
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7815
专题星系宇宙学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Xiamen Univ, Dept Phys, Xiamen 361005, Fujian, Peoples R China
3.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China
4.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
5.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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Huang, Feng,Chen, Xuelei,Yuan, Qiang,et al. Dark matter annihilation and non-thermal Sunyaev-Zel'dovich effect: II. Dwarf spheroidal galaxy[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(11).
APA Huang, Feng,Chen, Xuelei,Yuan, Qiang,&Bi, Xiaojun.(2010).Dark matter annihilation and non-thermal Sunyaev-Zel'dovich effect: II. Dwarf spheroidal galaxy.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(11).
MLA Huang, Feng,et al."Dark matter annihilation and non-thermal Sunyaev-Zel'dovich effect: II. Dwarf spheroidal galaxy".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .11(2010).
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