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Constraints on the dark matter annihilation from Fermi-LAT observation of M31
Li ZW(李正伟); Xu YP(徐玉朋); Zhengwei, L., H. Xiaoyuan, Y. Qiang and X. Yupeng
2016
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
ISSN1475-7516
Volume2016Issue:12Pages:28
SubtypeArticle
AbstractGamma-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.
Keyworddark matter experiments gamma ray experiments
DOI10.1088/1475-7516/2016/12/028
Indexed BySCI ; ADS ; ADS
Language英语
WOS IDWOS:000398395400018
ADS Bibcode2016JCAP...12..028L
ADS URLhttps://ui.adsabs.harvard.edu/abs/2016JCAP...12..028L
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2016JCAP...12..028L/citations
inspireid1275576
Citation statistics
Cited Times:13 [INSPIRE]
Cited Times:16 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/260816
Collection粒子天体物理中心
Affiliation中国科学院高能物理研究所
Recommended Citation
GB/T 7714
Li ZW,Xu YP,Zhengwei, L., H. Xiaoyuan, Y. Qiang and X. Yupeng. Constraints on the dark matter annihilation from Fermi-LAT observation of M31[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2016,2016(12):28.
APA 李正伟,徐玉朋,&Zhengwei, L., H. Xiaoyuan, Y. Qiang and X. Yupeng.(2016).Constraints on the dark matter annihilation from Fermi-LAT observation of M31.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2016(12),28.
MLA 李正伟,et al."Constraints on the dark matter annihilation from Fermi-LAT observation of M31".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 2016.12(2016):28.
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