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dc.contributorLaboratoire d'Astrophysique de Marseille (LAM)
dc.contributorAix Marseille Université (AMU) - INSU - Centre National de la Recherche Scientifique (CNRS)
dc.contributor.authorLokas, E. L.
dc.contributor.authorAthanassoula, E.
dc.contributor.authorDebattista, V. P.
dc.contributor.authorValluri, M.
dc.contributor.authorPino, A.,
dc.contributor.authorSemczuk, M.
dc.contributor.authorGajda, G.
dc.contributor.authorKowalczyk, K.
dc.date.accessioned2019-10-24T19:21:02Z
dc.date.available2019-10-24T19:21:02Z
dc.date.created2017-02-28 01:24
dc.date.issued2014-12
dc.identifieroai:HAL:hal-01442012v1
dc.identifierhal-01442012
dc.identifierhttps://hal.archives-ouvertes.fr/hal-01442012
dc.identifierDOI : 10.1093/mnras/stu1846
dc.identifier.doi: 10.1093/mnras/stu1846
dc.identifier.urihttp://hdl.handle.net/20.500.12424/1032149
dc.description.abstractInternational audience
dc.description.abstractUsing N-body simulations, we study the properties of a bar induced in a discy dwarf galaxy as a result of tidal interaction with the Milky Way. The bar forms at the first pericentre passage and survives until the end of the evolution at 10 Gyr. Fourier decomposition of the bar reveals that only even modes are significant and preserve a hierarchy so that the bar mode is always the strongest. They show a characteristic profile with a maximum, similar to simulated bars forming in isolated galaxies and observed bars in real galaxies. We adopt the maximum of the bar mode as a measure of the bar strength and we estimate the bar length by comparing the density profiles along the bar and perpendicular to it. The bar strength and the bar length decrease with time, mainly at pericentres, as a result of tidal torques acting at those times and not to secular evolution. The pattern speed of the bar varies significantly on a time-scale of 1 Gyr and is controlled by the orientation of the tidal torque from the Milky Way. The bar is never tidally locked, but we discover a hint of a 5/2 orbital resonance between the third and fourth pericentre passage. The speed of the bar decreases in the long run so that the bar changes from initially rather fast to slow in the later stages. The boxy/peanut shape is present for some time and its occurrence is preceded by a short period of buckling instability.
dc.languageen
dc.language.isoeng
dc.publisherHAL CCSD
dc.publisherOxford University Press (OUP): Policy P - Oxford Open Option A
dc.relation.ispartofinfo:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stu1846
dc.sourceISSN: 0035-8711
dc.subject[SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph]
dc.titleAdventures of a tidally induced bar
dc.typeinfo:eu-repo/semantics/article
ge.collectioncodeOAIDATA
ge.dataimportlabelOAI metadata object
ge.identifier.legacyglobethics:10671155
ge.identifier.permalinkhttps://www.globethics.net/gtl/10671155
ge.lastmodificationdate2017-02-28 01:24
ge.lastmodificationuseradmin@pointsoftware.ch (import)
ge.submissions0
ge.oai.exportid149001
ge.oai.repositoryid98404
ge.oai.setnameJournal articles
ge.oai.setnameSciences of the Universe [physics]
ge.oai.setnameLaboratoire d' Astrophysique de Marseille
ge.oai.setnameOSU INSTITUT PYTHEAS
ge.oai.setnameCNRS - Centre national de la recherche scientifique
ge.oai.setnameAix Marseille Université
ge.oai.setnameINSU - Institut National des Sciences de l'Univers
ge.oai.setspectype:ART
ge.oai.setspecsubject:sdu
ge.oai.setspeccollection:LAM
ge.oai.setspeccollection:OSU-INSTITUT-PYTHEAS
ge.oai.setspeccollection:CNRS
ge.oai.setspeccollection:UNIV-AMU
ge.oai.setspeccollection:INSU
ge.oai.streamid5
ge.setnameGlobeTheoLib
ge.setspecglobetheolib
ge.linkhttps://hal.archives-ouvertes.fr/hal-01442012


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