J/A+A/584/A113ivo://CDS.VizieR/J/A+A/584/A113doi:10.26093/cds/vizier.35840113CDSLelli F.Duc P.-A.Brinks E.Bournaud F.McGaugh S.S.Lisenfeld U.,Weilbacher P.M.Boquien M.Revaz Y.Braine J.Koribalski B.S.,Belles P.-E.2015-12-01T08:52:55Z2015-12-01T08:21:19ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frradio-galaxiesTidal dwarf galaxies (TDGs) are recycled objects that form within the collisional debris of interacting and merging galaxies. They are expected to be devoid of non-baryonic dark matter, since they can only form 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.2015A&A...584A.113Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/584/A113CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/584/A113https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/584/A113http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/584/A113https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/584/A113https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/584/A113http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/584/A113GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/584/A113/list (List of fits data cubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/584/A113/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/584/A113/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/584/A113/list?GETtext/xml+votable180.050000true192.0501410.980690.0055555555555555566/27905 43876 47078https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/584/A113?format=asciiRadiodefaultJ/A+A/584/A113/listList of fits data cubesNzNumber of slicesmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainScaleScale of the imagearcsec/pixinstr.scalefloatNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintDateObservation datetime.epoch;obsnullablebVELO-HEL? Lower value of velocity intervalkm/sphys.veloc;pos.heliocentricdoublenullableBVELO-HEL? Upper value of velocity intervalkm/sphys.veloc;pos.heliocentricdoublenullabledVELO-HEL? Velocity resolutionkm/sspect.resolutiondoublenullablebFREQ-OHEL? Lower value of frequency intervalHzem.freqdoublenullableBFREQ-OHEL? Upper value of frequency intervalHzem.freqdoublenullabledFREQ-OHEL? Frequency resolutionHzspect.resolutionintnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar