The indirect search for Dark Matter from the centre of the Galaxy with the Fermi LAT

Morselli, A. and Cañadas, B. and Vitale, V. (2011) The indirect search for Dark Matter from the centre of the Galaxy with the Fermi LAT. Il nuovo cimento C, 34 (3). pp. 311-316. ISSN 1826-9885

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Dark Matter (DM) constitutes around a 25% of the Universe, while baryons only a 4%. DM can be reasonably assumed to be made of particles, and many theories (Super-symmetry, Universal Extra Dimensions, etc.) predict Weakly Interacting Massive Particles (WIMPs) as natural DM candidates at the weak scale. Self-annihilation (or decay) of WIMPs might produce secondary γ-rays, via hadronization or as final state radiation. Since its launch in the 2008, the Large Area Telescope on-board of the Fermi γ-ray Space Telescope has detected the largest amount of γ-rays to date, in the 20MeV 300GeV energy range, allowing to perform a very sensitive indirect experimental search for DM (by means of high-energy γ-rays). DM forms large gravitationally bounded structures, the halos, which can host entire galaxies, such as the Milky Way. The DM distribution in the central part of the halos is not experimentally known, despite a very large density enhancement might be present. As secondary γ-rays production is very sensitive to WIMP density, a very effective search can be performed from the regions where the largest density is expected. Therefore the information provided by the DM halo N-body simulations is crucial. The largest γ-ray signal from DM annihilation is expected from the centre of the Galaxy. In the same region a large γ-ray background is produced by bright discrete sources and the cosmic rays interacting with the interstellar gas and the photons fields. Here we report an update of the indirect search for DM from the Galactic Center (GC).

Item Type: Article
Uncontrolled Keywords: Dark matter (stellar, interstellar, galactic, and cosmological) ; Elementary particle processes ; X- and γ-ray telescopes and instrumentation
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 06 Apr 2020 18:59
Last Modified: 06 Apr 2020 18:59

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