Constraints on the dark matter annihilation from Fermi-LAT observation of M31

doi:10.1088/1475-7516/2016/12/028

	Constraints on the dark matter annihilation from Fermi-LAT observation of M31
	Li, Zhengwei 1,2; Huang, Xiaoyuan 3; Yuan, Qiang 1; Xu, Yupeng 2
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2016-12-01
期号	12 页码:19
关键词	dark matter experiments gamma ray experiments
ISSN号	1475-7516
DOI	10.1088/1475-7516/2016/12/028
通讯作者	Yuan, Qiang(yuanq@pmo.ac.cn)
英文摘要	Gamma-ray is a good probe of dark matter (DM) particles in the Universe. We search for the DM annihilation signals in the direction of the Andromeda galaxy (M31) using 7.5 year Fermi-LAT pass 8 data. Similar to Pshirkov et al. (2016), we fi nd that there is residual excess emission from the direction of M31 if only the galactic disk as traced by the far infrared emission is considered. Adding a point-like source will improve the fi tting effectively, although additional slight improvements can be found if an extended component such as a uniform disk or two bubbles is added instead. Taking the far infrared disk plus a point source as the background model, we search for the DM annihilation signals in the data. We fi nd that there is strong degeneracy between the emission from the galaxy and that from 10s GeV mass DM annihilation in the main halo with quark fi nal state. However, the required DM annihilation cross section is about 10(-25)-10(-24)cm(3)s(-1), orders of magnitude larger than the constraints from observations of dwarf spheroidal galaxies, indicating a non-DM origin of the emission. If DM subhalos are taken into account, the degeneracy is broken. When considering the enhancement from DM subhalos, the constraints on DM model parameters are comparable to (or slightly weaker than) those from the population of dwarf spheroidal galaxies. We also discuss the inverse Compton scattering component from DM annihilation induced electrons/ positrons. For the fi rst time we include an energy dependent template of the inverse Compton emission (i.e., a template cube) in the data analysis to take into account the effect of diffusion of charged particles. We fi nd a significant improvement of the constraints in the high mass range of DM particles after considering the inverse Compton emission.
WOS关键词	LARGE-AREA TELESCOPE ; ANDROMEDA GALAXY ; MILKY-WAY ; HALO ; MASS ; MODELS ; DISK ; SIMULATION ; ELECTRONS ; ENERGIES
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000398395400018
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/23144]
专题	中国科学院紫金山天文台
通讯作者	Yuan, Qiang
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China 2.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, 19B Yuquan Rd, Beijing 100049, Peoples R China 3.Tech Univ Munich, Phys Dept T30d, James Franck Str, D-85748 Garching, Germany
推荐引用方式 GB/T 7714	Li, Zhengwei,Huang, Xiaoyuan,Yuan, Qiang,et al. Constraints on the dark matter annihilation from Fermi-LAT observation of M31[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2016(12):19.
APA	Li, Zhengwei,Huang, Xiaoyuan,Yuan, Qiang,&Xu, Yupeng.(2016).Constraints on the dark matter annihilation from Fermi-LAT observation of M31.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(12),19.
MLA	Li, Zhengwei,et al."Constraints on the dark matter annihilation from Fermi-LAT observation of M31".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .12(2016):19.