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Radio emission from dark matter annihilation in the Large Magellanic Cloud

Siffert, Beatriz B. and Limone, Angelo and Borriello, Enrico and Longo, Giuseppe and Miele, Gennaro (2011) Radio emission from dark matter annihilation in the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 410 (4). pp. 2463-2471. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20110302-075131176

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-2966.2010.17613.xDOIUNSPECIFIED
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2010.17613.x/abstractPublisherUNSPECIFIED
ORCID:
AuthorORCID
Longo, Giuseppe0000-0002-9182-8414
Additional Information:© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 August 29. Received 2010 August 27; in original form 2010 July 1. Article first published online: 15 Oct 2010. We would like to thank Maurizio Paolillo for fruitful discussions and Jean-Philippe Bernard for kindly sending us the dust temperature data. GM would like to thank the partial support of MIUR - PRIN2008 ‘Fisica Teorica Astroparticellare’.
Funders:
Funding AgencyGrant Number
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)UNSPECIFIED
Subject Keywords:magnetic fields – galaxies: individual: Large Magellanic Cloud – dark matter – radio continuum: galaxies
Issue or Number:4
Record Number:CaltechAUTHORS:20110302-075131176
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110302-075131176
Official Citation:Siffert, B. B., Limone, A., Borriello, E., Longo, G. and Miele, G. (2011), Radio emission from dark matter annihilation in the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 410: 2463–2471. doi: 10.1111/j.1365-2966.2010.17613.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22590
Collection:CaltechAUTHORS
Deposited By: Benjamin Perez
Deposited On:03 Mar 2011 05:05
Last Modified:09 Mar 2020 13:19

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