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Gas dynamics in tidal dwarf galaxies: disc formation at z=0

hal.structure.identifierCase Western Reserve University [Cleveland]
dc.contributor.authorLELLI, F.
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorDUC, P. -A.
hal.structure.identifierCentre for Astrophysics Research
dc.contributor.authorBRINKS, E.
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorBOURNAUD, F.
hal.structure.identifierCase Western Reserve University [Cleveland]
dc.contributor.authorMCGAUGH, S. S.
hal.structure.identifierCAFPE and Departamento de Fisica Teorica y del Cosmos
dc.contributor.authorLISENFELD, U.
hal.structure.identifierAstrophysikalisches Institut Potsdam [AIP]
dc.contributor.authorWEILBACHER, P. M.
hal.structure.identifierLaboratoire d'Astrophysique de Marseille [LAM]
dc.contributor.authorBOQUIEN, M.
hal.structure.identifierEPFL Laboratoire d’astrophysique
dc.contributor.authorREVAZ, Y.
hal.structure.identifierFORMATION STELLAIRE 2015
dc.contributor.authorBRAINE, J.
hal.structure.identifierAustralia Telescope National Facility [ATNF]
dc.contributor.authorKORIBALSKI, B. S.
hal.structure.identifierCentre for Astrophysics Research
dc.contributor.authorBELLES, P.-E.
dc.date.issued2015-09
dc.identifier.issn0004-6361
dc.description.abstractEnTidal dwarf galaxies (TDGs) are recycled objects that form within the collisional debris of interacting/merging galaxies. They are expected to be devoid of non-baryonic dark matter, since they can form only from dissipative material ejected from the discs of the progenitor galaxies. We investigate the gas dynamics in a sample of six bona-fide TDGs around three interacting and post-interacting systems: NGC 4694, NGC 5291, and NGC 7252 ("Atoms for Peace"). For NGC 4694 and NGC 5291 we analyse existing HI data from the Very Large Array (VLA), while for NGC 7252 we present new HI observations from the Jansky VLA together with long-slit and integral-field optical spectroscopy. For all six TDGs, the HI emission can be described by rotating disc models. These HI discs, however, have undergone less than a full rotation since the time of the interaction/merger event, raising the question of whether they are in dynamical equilibrium. Assuming that these discs are in equilibrium, the inferred dynamical masses are consistent with the observed baryonic masses, implying that TDGs are devoid of dark matter. This puts constraints on putative "dark discs" (either baryonic or non-baryonic) in the progenitor galaxies. Moreover, TDGs seem to systematically deviate from the baryonic Tully-Fisher relation. These results provide a challenging test for alternative theories like MOND.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.endark matter
dc.subject.engalaxies: interactions
dc.subject.engalaxies: dwarf
dc.subject.engalaxies: irregular
dc.subject.engalaxies: formation
dc.subject.engalaxies: kinematics and dynamics
dc.title.enGas dynamics in tidal dwarf galaxies: disc formation at z=0
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201526613
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1509.05404
dc.description.sponsorshipEuropeResolving Galaxy formation: Small-scale Internal physics in the Cosmological context
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA113
bordeaux.volume584
bordeaux.peerReviewedoui
hal.identifierhal-01202941
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01202941v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2015-09&rft.volume=584&rft.spage=A113&rft.epage=A113&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=LELLI,%20F.&DUC,%20P.%20-A.&BRINKS,%20E.&BOURNAUD,%20F.&MCGAUGH,%20S.%20S.&rft.genre=article


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