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dc.contributor.authorNg, Kenny CY
dc.contributor.authorRoach, Brandon M
dc.contributor.authorPerez, Kerstin
dc.contributor.authorBeacom, John F
dc.contributor.authorHoriuchi, Shunsaku
dc.contributor.authorKrivonos, Roman
dc.contributor.authorWik, Daniel R
dc.date.accessioned2021-10-27T20:35:50Z
dc.date.available2021-10-27T20:35:50Z
dc.date.issued2019
dc.identifier.urihttps://hdl.handle.net/1721.1/136541
dc.description.abstract© 2019 American Physical Society. We use a combined 1.2 Ms of NuSTAR observations of M31 to search for x-ray lines from sterile neutrino dark matter decay. For the first time in a NuSTAR analysis, we consistently take into account the signal contribution from both the focused and unfocused fields of view. We also reduce the modeling systematic uncertainty by performing spectral fits to each observation individually and statistically combining the results, instead of stacking the spectra. We find no evidence of unknown lines, and thus derive limits on the sterile neutrino parameters. Our results place stringent constraints for dark matter masses 12 keV, which reduces the available parameter space for sterile neutrino dark matter produced via neutrino mixing (e.g., in the νMSM) by approximately one-third. Additional NuSTAR observations, together with improved low-energy background modeling, could probe the remaining parameter space in the future. Lastly, we also report model-independent limits on generic dark matter decay rates and annihilation cross sections.
dc.language.isoen
dc.publisherAmerican Physical Society (APS)
dc.relation.isversionof10.1103/PHYSREVD.99.083005
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.sourceAPS
dc.titleNew constraints on sterile neutrino dark matter from NuSTAR M31 observations
dc.typeArticle
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physics
dc.relation.journalPhysical Review D
dc.eprint.versionFinal published version
dc.type.urihttp://purl.org/eprint/type/JournalArticle
eprint.statushttp://purl.org/eprint/status/PeerReviewed
dc.date.updated2021-06-28T15:49:07Z
dspace.orderedauthorsNg, KCY; Roach, BM; Perez, K; Beacom, JF; Horiuchi, S; Krivonos, R; Wik, DR
dspace.date.submission2021-06-28T15:49:09Z
mit.journal.volume99
mit.journal.issue8
mit.licensePUBLISHER_POLICY
mit.metadata.statusAuthority Work and Publication Information Needed


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