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Published May 15, 2015 | Published + Submitted
Journal Article Open

Search for gamma-ray emission from dark matter annihilation in the Large Magellanic Cloud with the Fermi Large Area Telescope

Abstract

At a distance of 50 kpc and with a dark matter mass of ∼10^(10)  M_⊙, the large magellanic cloud (LMC) is a natural target for indirect dark matter searches. We use five years of data from the Fermi Large Area Telescope (LAT) and updated models of the gamma-ray emission from standard astrophysical components to search for a dark matter annihilation signal from the LMC. We perform a rotation curve analysis to determine the dark matter distribution, setting a robust minimum on the amount of dark matter in the LMC, which we use to set conservative bounds on the annihilation cross section. The LMC emission is generally very well described by the standard astrophysical sources, with at most a 1–2σ excess identified near the kinematic center of the LMC once systematic uncertainties are taken into account. We place competitive bounds on the dark matter annihilation cross section as a function of dark matter particle mass and annihilation channel.

Additional Information

© 2015 American Physical Society. Received 2 February 2015. The Fermi LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include the National Aeronautics and Space Administration and the Department of Energy in the United States, the Commissariat à l'Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucléaire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK) and Japan Aerospace Exploration Agency (JAXA) in Japan, and the K. A. Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d'Études Spatiales in France. We thank Knut Olsen for his help in analyzing the LMC H I rotational velocity data and Charles Keeton for his help in the calculation of the magnitude of the gravitational lensing caused by the LMC. Finally, we thank Johann Cohen-Tanugi, Gabrijela Zaharijas, Rouven Essig and Neelima Sehgal for help with quantifying the effects of electroweak corrections to the dark matter spectra.

Attached Files

Published - PhysRevD.91.102001.pdf

Submitted - 1502.01020v2.pdf

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August 20, 2023
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