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dc.contributor.authorConlon, Joseph Pen
dc.contributor.authorDay, Francescaen
dc.date.accessioned2018-09-20T12:03:36Z
dc.date.available2018-09-20T12:03:36Z
dc.date.issued2014-11en
dc.identifier.issn1475-7516
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/280447
dc.description.abstractWe further explore a scenario in which the recently observed 3.55 keV photon line arises from dark matter decay to an axion-like particle (ALP) of energy 3.55 keV, which then converts to a photon in astrophysical magnetic fields. This ALP scenario is well-motivated by the observed morphology of the 3.55 keV flux. For this scenario we study the expected flux from dark matter decay in the galactic halos of both the Milky Way and Andromeda (M31). The Milky Way magnetic field is asymmetric about the galactic centre, and so the resulting 3.55 keV flux morphology differs significantly from the case of direct dark matter decay to photons. However the Milky Way magnetic field is not large enough to generate an observable signal, even with ASTRO-H. In contrast, M31 has optimal conditions for alpha -> gamma conversion and the intrinsic signal from M31 becomes two orders of magnitude larger than for the Milky Way, comparable to that from clusters and consistent with observations.
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectdark matter theoryen
dc.subjectaxionsen
dc.subjectdark matter simulationsen
dc.title3.55 keV photon lines from axion to photon conversion in the Milky Way and M31en
dc.typeArticle
prism.issueIdentifier11en
prism.numberARTN 033en
prism.publicationDate2014en
prism.publicationNameJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICSen
dc.identifier.doi10.17863/CAM.27818
rioxxterms.versionofrecord10.1088/1475-7516/2014/11/033en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2014-11en
dc.contributor.orcidDay, Francesca [0000-0001-9475-8856]
dc.identifier.eissn1475-7516
rioxxterms.typeJournal Article/Reviewen


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International