Galactic substructure and dark-matter annihilation in the Milky Way halo

Journal Article · Mon Feb 15 04:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.043532· OSTI ID:21409285

Kamionkowski, Marc ^[1]; Koushiappas, Savvas M ^[2]; Kuhlen, Michael ^[3]

---

1. California Institute of Technology, Mail Code 350-17, Pasadena, California 91125 (United States)
2. Department of Physics, Brown University, 182 Hope Street, Providence, Rhode Island 02912 (United States)
3. Theoretical Astrophysics Center, University of California Berkeley, Berkeley, California 94720 (United States)

We study the effects of substructure on the rate of dark-matter annihilation in the Galactic halo. We use an analytic model for substructure that can extend numerical simulation results to scales too small to be resolved by the simulations. We first calibrate the analytic model to numerical simulations, and then determine the annihilation boost factor, for standard weakly interacting massive particle (WIMP) models as well as those with Sommerfeld (or other) enhancements, as a function of galactocentric radius in the Milky Way. We provide an estimate of the dependence of the gamma-ray intensity of WIMP annihilation as a function of angular distance from the Galactic center. This methodology, coupled with future numerical simulation results can be a powerful tool that can be used to constrain WIMP properties using Fermi all-sky data.

• OSTI ID: 21409285
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
ANNIHILATION
COMPUTERIZED SIMULATION
ELECTROMAGNETIC RADIATION
GALAXIES
GAMMA RADIATION
INTERACTIONS
IONIZING RADIATIONS
MATTER
MILKY WAY
NONLUMINOUS MATTER
PARTICLE INTERACTIONS
PARTICLES
RADIATIONS
SIMULATION