Pre-launch estimates for GLAST sensitivity to dark matter annihilation signals

doi:10.1088/1475-7516/2008/07/013

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E A Baltz et al JCAP07(2008)013 doi:10.1088/1475-7516/2008/07/013

Pre-launch estimates for GLAST sensitivity to dark matter annihilation signals

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E A Baltz¹, B Berenji¹, G Bertone², L Bergström³, E Bloom¹, T Bringmann³, J Chiang¹, J Cohen-Tanugi¹, J Conrad^3,13, Y Edmonds¹, J Edsjö³, G Godfrey¹, R E Hughes⁴, R P Johnson⁵, A Lionetto⁶, A A Moiseev⁷, A Morselli⁶, I V Moskalenko⁸, E Nuss⁹, J F Ormes¹⁰, R Rando¹¹, A J Sander⁴, A Sellerholm³, P D Smith⁴, A W Strong¹², L Wai¹, P Wang¹ and B L Winer⁴

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conrad@physto.se

¹ Stanford Linear Accelerator Center (SLAC), Kavli Institute for Particle Astrophysics and Cosmology (KIPAC), Menlo Park, CA 94025, USA
² Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F-75014 Paris, France
³ Physics Department, Stockholm University, Albanova, SE-10691 Stockholm, Sweden
⁴ The Ohio State University, Columbus, OH 43210, USA
⁵ Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, CA 95064, USA
⁶ INFN Roma Tor Vergata, via della Ricerca Scientifica 1, Roma, Italy
⁷ CRESST and AstroParticle Physics Laboratory, NASA/GSFC, Greenbelt, MD 20771, USA
⁸ Hansen Experimental Physics Laboratory and Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305, USA
⁹ LPTA, University of Montpellier, CNRS/IN2P3, Montpellier, France
¹⁰ University of Denver, Denver, CO 80208, USA
¹¹ INFN, Sezione di Padova, Via Marzolo 8, Padova, I-35131, Italy
¹² Max-Planck-Institut für Extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany
¹³ Author to whom any correspondence should be addressed

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Abstract References Cited By

We investigate the sensitivity of the Gamma-ray Large Area Space Telescope (GLAST) for indirectly detecting weakly interacting massive particles (WIMPs) through the γ-ray signal that their pair annihilation produces. WIMPs are among the favorite candidates for explaining the compelling evidence that about 80% of the mass in the Universe is non-baryonic dark matter (DM). They are serendipitously motivated by various extensions of the standard model of particle physics such as supersymmetry and universal extra dimensions (UED). With its unprecedented sensitivity and its very large energy range (20 MeV to more than 300 GeV) the main instrument on board the GLAST satellite, the Large Area Telescope (LAT), will open a new window of discovery. As our estimates show, the LAT will be able to detect an indirect DM signature for a large class of WIMP models given a cuspy profile for the DM distribution. Using the current state of the art Monte Carlo and event reconstruction software developed within the LAT collaboration, we present preliminary sensitivity studies for several possible sources inside and outside the Galaxy. We also discuss the potential of the LAT to detect UED via the electron/positron channel. Diffuse background modeling and other background issues that will be important in setting limits or seeing a signal are presented.

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