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dc.contributor.authorPeñarrubia, Jorgeen
dc.contributor.authorGómez, Facundo Aen
dc.contributor.authorBesla, Gurtinaen
dc.contributor.authorErkal, Denisen
dc.contributor.authorMa, Yin-Zheen
dc.date.accessioned2016-01-29T15:47:11Z
dc.date.available2016-01-29T15:47:11Z
dc.date.issued2015-11-26en
dc.identifier.citationJ. Peñarrubia et al. MNRAS (2015). vol. 456, issue 1: pp. L54-L58. DOI: 10.1093/mnrasl/slv160en
dc.identifier.issn1745-3925
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/253558
dc.description.abstractThis paper explores the effect of the Large Magellanic Cloud (LMC) on the mass estimates obtained from the timing argument. We show that accounting for the presence of the LMC systematically lowers the Local Group mass (MLG) derived from the relative motion of the Milky Way–Andromeda pair. Motivated by this result, we apply a Bayesian technique devised by Penarrubia et al. to simultaneously fit (i) distances and velocities of galaxies within ˜ 3 Mpc and (ii) the relative motion between the Milky Way and Andromeda derived from HST observations, with the LMC mass (MLMC) as a free parameter. Our analysis returns a Local Group mass MLG = 2.64+0.42 −0.38 × 1012 M at a 68 per cent confidence level. The masses of the Milky Way, MMW = 1.04+0.26 −0.23 × 1012 M, and Andromeda, MM31 = 1.33+0.39 −0.33 × 1012 M, are consistent with previous estimates that neglect the impact of the LMC on the observed Hubble flow. We find a (total) LMC mass MLMC = 0.25+0.09 −0.08 × 1012 M, which is indicative of an extended dark matter halo and supports the scenario where this galaxy is just past its first pericentric approach. Consequently, these results suggest that the LMC may induce significant perturbations on the Galactic potential.
dc.description.sponsorshipThe research leading to these results has received ERC funding under the programme (FP/2007-2013)/ERC Grant Agreement no. 308024.
dc.languageEnglishen
dc.language.isoenen
dc.publisherOUP
dc.subjectGalaxy: kinematics and dynamicsen
dc.subjectgalaxies: evolutionen
dc.titleA timing constraint on the (total) mass of the Large Magellanic Clouden
dc.typeArticle
dc.provenanceOA-6840
dc.description.versionThis is the author accepted manuscript. The final version is available from [publisher] via http://dx.doi.org/10.1093/mnrasl/slv160en
prism.endingPageL58
prism.publicationDate2015en
prism.publicationNameMNRASen
prism.startingPageL54
prism.volume456en
rioxxterms.versionofrecord10.1093/mnrasl/slv160en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2015-11-26en
dc.identifier.eissn1745-3933
rioxxterms.typeJournal Article/Reviewen


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