Exploring Dark Matter with Milky Way Substructure

Kuhlen, M.; Madau, P.; Silk, J.

doi:10.1126/science.1174881

Exploring Dark Matter with Milky Way Substructure

Journal Article · Thu Jul 16 04:00:00 EDT 2009 · Science

DOI:https://doi.org/10.1126/science.1174881· OSTI ID:1564667

Kuhlen, M.; Madau, P.; Silk, J.

The unambiguous detection of dark matter annihilation in our Galaxy would unravel one of the most outstanding puzzles in particle physics and cosmology. Recent observations have motivated models in which the annihilation rate is boosted by the Sommerfeld effect, a nonperturbative enhancement arising from a long-range attractive force. We applied the Sommerfeld correction to Via Lactea II, a high-resolution N-body simulation of a Milky Way-sized galaxy, to investigate the phase-space structure of the galactic halo. We found that the annihilation luminosity from kinematically cold substructure could be enhanced by orders of magnitude relative to previous calculations, leading to the prediction of gamma-ray fluxes from as many as several hundred dark clumps that should be detectable by the Fermi satellite.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

OSTI ID:: 1564667

Journal Information:: Science, Journal Name: Science Journal Issue: 5943 Vol. 325; ISSN 0036-8075

Publisher:: AAAS

Country of Publication:: United States

Language:: English

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