A Combined Analysis on Clusters of Galaxies with the Fermi-LAT - Gamma Ray Emission from Cosmic Rays and Dark Matter

Details A Combined Analysis on Clusters of Galaxies with the Fermi-LAT - Gamma Ray Emission from Cosmic Rays and Dark Matter A Combined Analysis on Clusters of Galaxies with the Fermi-LAT - Gamma Ray Emission from Cosmic Rays and Dark Matter

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21920701z&link_type=abstract

American Astronomical Society, AAS Meeting #219, #207.01

Astronomy and Astrophysics

Astrophysics

Scientific paper

Clusters of galaxies are the largest virialized structures in the universe. Radio observations indicate the presence of a relativisitic electron population that can give rise to a distinct gamma-ray signature through scattering with low energy photons. In addition, gamma-rays can result from collisions of cosmic-ray protons with particles in the intracluster medium through subsequent πi0 decay.
Moreover, clusters of galaxies possess high mass-to-light ratios, making them interesting targets for indirect dark matter searches. In this case, gamma rays may be produced from the decay or annihilation of dark-matter particles. In either of these emission scenarios the spectra of gamma rays produced is predicted to be significantly different from those of conventional astrophysical sources and from the diffuse galactic and extra-galactic background emission. Observations with the Fermi-LAT, therefore, have the potential to unambiguously identify these processes in clusters of galaxies. The spectral characteristics of dark-matter annihilation or decay and of cosmic-ray emission are expected to be universal in different clusters, making a combined statistical treatment feasible.
We present a combined likelihood analysis and set limits on the dark-matter annihilation cross section or decay time and on the hadron injection efficiency.

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