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Type: Journal article
Title: A search for a dark matter annihilation signal towards the Canis Major overdensity with H.E.S.S.
Author: Aharonian, F.
Akhperjanian, A.
Barres de Almaida, U.
Bazer-Bachi, A.
Behera, B.
Benbow, W.
Bernlohr, K.
Boisson, C.
Bochow, A.
Borrel, V.
Braun, I.
Brion, E.
Brucker, J.
Brun, P.
Buhler, R.
Bulik, T.
Busching, I.
Boutelier, T.
Carrigan, S.
Chadwick, P.
et al.
Citation: The Astrophysical Journal: an international review of astronomy and astronomical physics, 2009; 691(1):175-181
Publisher: Univ Chicago Press
Issue Date: 2009
ISSN: 0004-637X
Statement of
F. Aharonian... G. Rowell... et al.
Abstract: A search for a dark matter (DM) annihilation signal into γ-rays toward the direction of the Canis Major (CMa) overdensity is presented. The nature of CMa is still controversial and one scenario represents it as a dwarf galaxy, making it an interesting candidate for DM annihilation searches. A total of 9.6 hr of high-quality data were collected with the H.E.S.S. array of Imaging Atmospheric Cherenkov Telescopes, and no evidence for a very high energy γ-ray signal is found. Upper limits on the CMa dwarf galaxy mass of the order of 109 M are derived at the 95% confidence level (CL) assuming neutralino masses in the range 500 GeV-10 TeV and relatively large annihilation cross sections. Constraints on the velocity-weighted annihilation cross section σv are calculated for specific weakly interacting massive-particle scenarios, using a Navarro-Frenk-White model for the DM halo profile and taking advantage of numerical simulations of hierarchical structure formation. Assuming a total halo mass of 3 × 108 M , 95% CL exclusion limits of the order of 5 × 10–24 cm3 s–1 are reached in the 500 GeV-10 TeV DM particle mass interval.
Keywords: dark matter
galaxies: dwarf
gamma rays: observations
Description: © 2009. The American Astronomical Society. All rights reserved.
DOI: 10.1088/0004-637X/691/1/175
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