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dc.contributor.authorBrinckmann, Thejs
dc.contributor.authorZavala, Jesús
dc.contributor.authorRapetti, David
dc.contributor.authorHansen, Steen H
dc.contributor.authorVogelsberger, Mark
dc.date.accessioned2021-10-27T20:09:32Z
dc.date.available2021-10-27T20:09:32Z
dc.date.issued2018
dc.identifier.urihttps://hdl.handle.net/1721.1/134863
dc.description.abstract© 2015 The Authors. We perform dark-matter-only simulations of 28 relaxed massive cluster-sized haloes for cold dark matter (CDM) and self-interacting dark matter (SIDM) models, to study structural differences between the models at large radii, where the impact of baryonic physics is expected to be very limited. We find that the distributions for the radial profiles of the density, ellipsoidal axial ratios and velocity anisotropies (β) of the haloes differ considerably between the models (at the ~1σ level), even at ≳10 per cent of the virial radius, if the self-scattering cross-section is σ/mχ = 1 cm2 g-1. Direct comparison with observationally inferred density profiles disfavours SIDM for s/mχ = 1 cm2 g-1, but in an intermediate radial range (~3 per cent of the virial radius), where the impact of baryonic physics is uncertain. At this level of the crosssection, we find a narrower β distribution in SIDM, clearly skewed towards isotropic orbits, with no SIDM (90 per cent of CDM) haloes having β > 0.12 at 7 per cent of the virial radius. We estimate that with an observational sample of ~30 (~1015 M⊙) relaxed clusters, β can potentially be used to put competitive constraints on SIDM, once observational uncertainties improve by a factor of a few.We study the suppression of the memory of halo assembly history in SIDM clusters. For σ/mχ = 1 cm2 g-1, we find that this happens only in the central halo regions (~1/4 of the scale radius of the halo), and only for haloes that assembled their mass within this region earlier than a formation redshift zf ~ 2. Otherwise, the memory of assembly remains and is reflected in ways similar to CDM, albeit with weaker trends.
dc.language.isoen
dc.publisherOxford University Press (OUP)
dc.relation.isversionof10.1093/MNRAS/STX2782
dc.rightsCreative Commons Attribution-Noncommercial-Share Alike
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.sourcearXiv
dc.titleThe structure and assembly history of cluster-sized haloes in self-interacting dark matter
dc.typeArticle
dc.relation.journalMonthly Notices of the Royal Astronomical Society
dc.eprint.versionAuthor's final manuscript
dc.type.urihttp://purl.org/eprint/type/JournalArticle
eprint.statushttp://purl.org/eprint/status/PeerReviewed
dc.date.updated2019-06-12T12:22:58Z
dspace.orderedauthorsBrinckmann, T; Zavala, J; Rapetti, D; Hansen, SH; Vogelsberger, M
dspace.date.submission2019-06-12T12:23:00Z
mit.journal.volume474
mit.journal.issue1
mit.metadata.statusAuthority Work and Publication Information Needed


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