Journal Article

Radio emission from dark matter annihilation in the Large Magellanic Cloud

Beatriz B. Siffert, Angelo Limone, Enrico Borriello, Giuseppe Longo and Gennaro Miele

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 4, pages 2463-2471
Published in print February 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI:
Radio emission from dark matter annihilation in the Large Magellanic Cloud

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The Large Magellanic Cloud (LMC), at only 50 kpc away from us and known to be dark matter dominated, is clearly an interesting place where to search for dark matter annihilation signals. In this paper, we estimate the synchrotron emission due to weakly interacting massive particle (WIMP) annihilation in the halo of the LMC at two radio frequencies, 1.4 and 4.8 GHz, and compare it to the observed emission, in order to impose constraints in the WIMP mass versus annihilation cross-section plane. We use available Faraday rotation data from background sources to estimate the magnitude of the magnetic field in different regions of the LMC's disc, where we calculate the radio signal due to dark matter annihilation. We account for the e+e energy losses due to synchrotron, inverse Compton scattering and bremsstrahlung, using the observed hydrogen and dust temperature distribution on the LMC to estimate their efficiency. The extensive use of observations, allied with conservative choices adopted in all the steps of the calculation, allows us to obtain very realistic constraints.

Keywords: magnetic fields; galaxies: individual: Large Magellanic Cloud; dark matter; radio continuum: galaxies

Journal Article.  5536 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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