dc.contributor.author | Siegert, Thomas | |
dc.contributor.author | Boehm, Celine | |
dc.contributor.author | Calore, Francesca | |
dc.contributor.author | Diehl, Roland | |
dc.contributor.author | Krause, Martin G. H. | |
dc.contributor.author | Serpico, Pasquale D. | |
dc.contributor.author | Vincent, Aaron C. | |
dc.date.accessioned | 2022-01-11T11:15:01Z | |
dc.date.available | 2022-01-11T11:15:01Z | |
dc.date.issued | 2022-03-01 | |
dc.identifier.citation | Siegert , T , Boehm , C , Calore , F , Diehl , R , Krause , M G H , Serpico , P D & Vincent , A C 2022 , ' An INTEGRAL/SPI view of reticulum II: Particle dark matter and primordial black holes limits in the MeV range ' , Monthly Notices of the Royal Astronomical Society , vol. 511 , no. 1 , stac008 , pp. 914-924 . https://doi.org/10.1093/mnras/stac008 | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/2109.03791v2 | |
dc.identifier.other | ORCID: /0000-0002-9610-5629/work/118366181 | |
dc.identifier.uri | http://hdl.handle.net/2299/25296 | |
dc.description | © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stac008 | |
dc.description.abstract | Reticulum II (Ret II) is a satellite galaxy of the Milky Way and presents a prime target to investigate the nature of dark matter (DM) because of its high mass-to-light ratio. We evaluate a dedicated INTEGRAL observation campaign data set to obtain $\gamma$-ray fluxes from Ret II and compare those with expectations from DM. Ret II is not detected in the $\gamma$-ray band 25--8000 keV, and we derive a flux limit of $\lesssim 10^{-8}\,\mathrm{erg\,cm^{-2}\,s^{-1}}$. The previously reported 511 keV line is not seen, and we find a flux limit of $\lesssim 1.7 \times 10^{-4}\,\mathrm{ph\,cm^{-2}\,s^{-1}}$. We construct spectral models for primordial black hole (PBH) evaporation and annihilation/decay of particle DM, and subsequent annihilation of positrons produced in these processes. We exclude that the totality of DM in Ret II is made of a monochromatic distribution of PBHs of masses $\lesssim 8 \times 10^{15}\,\mathrm{g}$. Our limits on the velocity-averaged DM annihilation cross section into $e^+e^-$ are $\langle \sigma v \rangle \lesssim 5 \times 10^{-28} \left(m_{\rm DM} / \mathrm{MeV} \right)^{2.5}\,\mathrm{cm^3\,s^{-1}}$. We conclude that analysing isolated targets in the MeV $\gamma$-ray band can set strong bounds on DM properties without multi-year data sets of the entire Milky Way, and encourage follow-up observations of Ret II and other dwarf galaxies. | en |
dc.format.extent | 11 | |
dc.format.extent | 1644301 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | astro-ph.HE | |
dc.subject | astro-ph.CO | |
dc.title | An INTEGRAL/SPI view of reticulum II: Particle dark matter and primordial black holes limits in the MeV range | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1093/mnras/stac008 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |