Show simple item record

dc.contributor.authorVollmann, Martin
dc.contributor.authorHeesen, Volker
dc.contributor.authorShimwell, Timothy
dc.contributor.authorHardcastle, Martin J.
dc.contributor.authorBrüggen, Marcus
dc.contributor.authorSigl, Günter
dc.contributor.authorRöttgering, Huub
dc.date.accessioned2020-06-19T00:06:17Z
dc.date.available2020-06-19T00:06:17Z
dc.date.issued2020-06-13
dc.identifier.citationVollmann , M , Heesen , V , Shimwell , T , Hardcastle , M J , Brüggen , M , Sigl , G & Röttgering , H 2020 , ' Radio constraints on dark matter annihilation in Canes Venatici I with LOFAR ' , Monthly Notices of the Royal Astronomical Society . https://doi.org/10.1093/mnras/staa1657
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 17463245
dc.identifier.otherPURE UUID: 56386bb1-5b19-48d8-86e2-4126c85875a1
dc.identifier.otherArXiv: http://arxiv.org/abs/1909.12355v1
dc.identifier.otherScopus: 85091441969
dc.identifier.urihttp://hdl.handle.net/2299/22877
dc.descriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.description.abstractDwarf galaxies are dark matter-dominated and therefore promising targets for the search for weakly interacting massive particles (WIMPs), which are well-known candidates for dark matter. Annihilation of WIMPs produce ultra-relativistic cosmic-ray electrons and positrons that emit synchrotron radiation in the presence of magnetic fields. For typical magnetic field strengths (few $\mu $G) and $\mathcal O$(GeV-TeV) WIMP masses (and thus typical electron energies of the same order) this emission peaks at hundreds of MHz. Here, we use the non-detection of 150-MHz radio continuum emission from the dwarf spheroidal galaxy `Canes Venatici I' with the LOw-Frequency ARray (LOFAR) to derive constraints on the annihilation cross section of WIMPs into primary electron-positron and other fundamental particle-antiparticle pairs. In this first-of-its-kind LOFAR study, we obtain new constraints on annihilating WIMP dark matter (DM). Using conservative estimates for the magnetic field strengths and diffusion coefficients, we obtain limits that are comparable with those by the Fermi Large Area Telescope (Fermi-LAT) using gamma-ray observations. Assuming s-wave annihilation and WIMPs making up 100% of the DM density, our limits exclude several thermal WIMP realisations in the $[2,20]$-GeV mass range. A more ambitious multi-wavelength and multi-target LOFAR study could improve these limits by a few orders of magnitude.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectastro-ph.HE
dc.subjecthep-ph
dc.titleRadio constraints on dark matter annihilation in Canes Venatici I with LOFARen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/staa1657
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record