Dissecting the spin distribution of dark matter haloes

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dc.contributor.authorAntonuccio-Delogu, V.
dc.contributor.authorDobrotka, A.
dc.contributor.authorBecciani, U.
dc.contributor.authorCielo, S.
dc.contributor.authorGiocoli, C.
dc.contributor.authorMacciò, A.V.
dc.contributor.authorRomeo-Veloná. A.
dc.date.accessioned2025-05-20T16:41:20Z
dc.date.available2025-05-20T16:41:20Z
dc.date.issued2010-09
dc.descriptionIndexación: Scopus.
dc.description.abstractThe spin probability distribution of dark matter haloes has often been modelled as being very near to a lognormal. Most of the theoretical attempts to explain its origin and evolution invoke some hypotheses concerning the influence of tidal interactions or merging on haloes. Here we apply a very general statistical theorem introduced by Cramér (1936) to study the origin of the deviations from the reference lognormal shape: we find that these deviations originate from correlations between two quantities entering the definition of spin, namely the ratio J/M5/2 (which depends only on mass) and the modulus E of the total (gravitational + kinetic) energy.To reach this conclusion, we have made usage of the results deduced from two high spatial- and mass-resolution simulations. Our simulations cover a relatively small volume and produce a sample of more than 16 000 gravitationally bound haloes, each traced by at least 300 particles. We verify that our results are stable to different systematics, by comparing our results with those derived by the gif2 and by a more recent simulation performed by Macciò et al.We find that the spin probability distribution function shows systematic deviations from a lognormal, at all redshifts z ≲ 1. These deviations depend on mass and redshift: at small masses they change little with redshift, and also the best lognormal fits are more stable. The J -M relationship is well described by a power law of exponent α very near to the linear theory prediction (α = 5/3), but systematically lower than this at z ≲ 0.3. We argue that the fact that deviations from a lognormal PDF are present only for high-spin haloes could point to a role of large-scale tidal fields in the evolution of the spin PDF. © 2010 The Authors. Journal compilation © 2010 RAS.
dc.description.accesoabiertoSi
dc.description.agradACKNOWLEDGMENTS V A-D gratefully acknowledges the hospitality of the Institute for Theoretical Astrophysics of the Ruprecht-Karls University of Hei delberg, where part of this programme was performed. The work of V A-D has been supported by grant no. 330 of the HPC-Europa 2 Transational Access Program. AD acknowledges the Slovak Academy of Sciences Grant No. 2/0078/10 and HPC Europa grants HPC04MXW87 and HPC0477ZZL. ADR acknowl edges partial support from ALMA-CONICYT FUNDS through grant 31070023, from FONDECYT – Proyecto de Iniciacion a la ´ Investigacion No. 11090389, and from UNAB – Proyecto Regular ´ No. DI-35-09/R. This work makes usage of results produced by the PI2S2 Project managed by the Consorzio COMETA, a project co funded by the Italian Ministry of University and Research (MIUR) within the Piano Operativo Nazionale ‘Ricerca Scien tifica, Sviluppo Tecnologico, Alta Formazione’ (PON 2000-2006). More information is available at http://www.pi2s2.it (in italian) and http://www.trigrid.it/pbeng/engindex.php . Finally, we would like to acknowledge the referee for his/her comments, which greatly improved the paper.
dc.description.urihttps://academic-oup-com.recursosbiblioteca.unab.cl/mnras/article/407/2/1338/1128244?login=true&token=eyJhbGciOiJub25lIn0.eyJleHAiOjE3NTAzNDUzODgsImp0aSI6IjY4ODYyNzA3LTgxOTctNDYyYy1hZmRmLTg4NzA2NzIxZjU2ZiJ9.
dc.identifier.citationMonthly Notices of the Royal Astronomical Society. Volume 407, Issue 2, Pages 1338 - 1346. September 2010
dc.identifier.doi10.1111/j.1365-2966.2010.16989.x
dc.identifier.folioALMA-CONICYT FUNDS through rant 31070023, from FONDECYT
dc.identifier.folioProyecto de Iniciación a la Investigación No. 11090389
dc.identifier.folioUNAB – Proyecto Regular No. DI-35-09/R.
dc.identifier.generoH
dc.identifier.issn0035-8711
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/64794
dc.language.isoen
dc.publisherBlackwell Publishing Ltd
dc.subjectCosmology: Dark Matter
dc.subjectGalaxies: Haloes
dc.subjectMethods: Numerical
dc.titleDissecting the spin distribution of dark matter haloes
dc.typeArtículo
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