Gamma rays from dark matter subhalos revisited: refining the predictions and constraints

被引：26
作者：
Hooper, Dan [1 ,2 ,3 ]
Witte, Samuel J. [1 ,4 ]
机构：
[1] Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, Kirk Rd & Pine St, Batavia, IL 60510 USA
[2] Univ Chicago, Dept Astron & Astrophys, 5720 S Ellis Ave, Chicago, IL 60637 USA
[3] Univ Chicago, Kavli Inst Cosmol Phys, 5640 S Ellis Ave, Chicago, IL 60637 USA
[4] Univ Calif Los Angeles, Dept Phys & Astron, 475 Portola Plaza, Los Angeles, CA 90095 USA
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2017年 / 04期
关键词：
dark matter experiments; dark matter simulations; dark matter theory; gamma ray experiments; DENSITY PROFILES; GALACTIC-CENTER; MILKY-WAY; FERMI-LAT; DWARF GALAXIES; SUBSTRUCTURE; EVOLUTION; HALOES; COLD; ANNIHILATION;
D O I：
10.1088/1475-7516/2017/04/018
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Utilizing data from the ELVIS and Via Lactea-II simulations, we characterize the local dark matter subhalo population, and use this information to refine the predictions for the gamma-ray fluxes arising from annihilating dark matter in this class of objects. We find that the shapes of nearby subhalos are significantly altered by tidal effects, and are generally not well described by NFW density profiles, instead prefering power-law profiles with an exponential cutoff. From the subhalo candidates detected by the Fermi Gamma-Ray Space Telescope, we place limits on the dark matter annihilation cross section that are only modestly weaker than those based on observations of dwarf galaxies. We also calculate the fraction of observable subhalos that are predicted to be spatially extended at a level potentially discernible to Fermi.
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页数：25
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