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https://hdl.handle.net/2440/56488
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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 1538-4357 |
Statement of Responsibility: | 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 |
Published version: | http://dx.doi.org/10.1088/0004-637x/691/1/175 |
Appears in Collections: | Aurora harvest Physics publications |
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