3 research outputs found
Fitting the Gamma-Ray Spectrum from Dark Matter with DMFIT: GLAST and the Galactic Center Region
We study the potential of GLAST to unveil particle dark matter properties
with gamma-ray observations of the Galactic center region. We present full
GLAST simulations including all gamma-ray sources known to date in a region of
4 degrees around the Galactic center, in addition to the diffuse gamma-ray
background and to the dark matter signal. We introduce DMFIT, a tool that
allows one to fit gamma-ray emission from pair-annihilation of generic particle
dark matter models and to extract information on the mass, normalization and
annihilation branching ratios into Standard Model final states. We assess the
impact and systematic effects of background modeling and theoretical priors on
the reconstruction of dark matter particle properties. Our detailed simulations
demonstrate that for some well motivated supersymmetric dark matter setups with
one year of GLAST data it will be possible not only to significantly detect a
dark matter signal over background, but also to estimate the dark matter mass
and its dominant pair-annihilation mode.Comment: 37 pages, 16 figures, submitted to JCA
Dark Matter Signatures in the Anisotropic Radio Sky.
We calculate intensity and angular power spectrum of the cosmological
background of synchrotron emission from cold dark matter annihilations into
electron positron pairs. We compare this background with intensity and
anisotropy of astrophysical and cosmological radio backgrounds, such as from
normal galaxies, radio-galaxies, galaxy cluster accretion shocks, the cosmic
microwave background and with Galactic foregrounds. Under modest assumptions
for the dark matter clustering we find that around 2 GHz average intensity and
fluctuations of the radio background at sub-degree scales allows to probe dark
matter masses >100 GeV and annihilation cross sections not far from the natural
values ~ 3 x 10^(-26) cm^3/s required to reproduce the correct relic
density of thermal dark matter. The angular power spectrum of the signal from
dark matter annihilation tends to be flatter than that from astrophysical radio
backgrounds. Furthermore, radio source counts have comparable constraining
power. Such signatures are interesting especially for future radio detectors
such as SKA.Comment: 30 papes, jcap preprint format, 11 figures; final version, very minor
change