2012/09/11 by Bibhushan Shakya, Shakya, Bibhushan
Physics and Astronomy · #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph) #astro-ph.HE #hep-ph
paper · pdf · doi:10.48550/arxiv.1209.2427
16 pages, 2 figures. Fit to Fermi data updated to include data for the full spectrum where possible. Main results and conclusions unchanged
arxiv created 2012/10/16 · arxiv updated 2012/10/17
The viability of neutralino dark matter as an explanation of the 130 GeV gamma ray signal from the Galactic Center recently observed by the Fermi Large Area Telescope is examined. It is found that the signal can be compatible with a sharp feature from internal bremsstrahlung from a mostly bino dark matter particle of mass around 145 GeV, augmented by a contribution from annihilation into gamma+Z via a small wino admixture. This scenario circumvents the problematic overproduction of lower energy continuum photons that plague line interpretations of this signal. Sleptons approximately degenerate in mass with the neutralino are required to enhance the internal bremsstrahlung feature.