J/MNRAS/449/4048ivo://CDS.VizieR/J/MNRAS/449/4048doi:10.26093/cds/vizier.74494048CDSKam Z.S.Carignan C.Chemin L.Amram P.Epinat B.2024-08-14T20:21:24Z2017-12-18T08:47:15ZCDS support team

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

cds-question@unistra.frgalaxiesgalaxy-rotationinterferometryAs part of a long-term project to revisit the kinematics and dynamics of the large disc galaxies of the Local Group, we present the first deep, wide-field (~42arcmin x 56arcmin) 3D-spectroscopic survey of the ionized gas disc of Messier 33. Fabry-Perot interferometry has been used to map its H{alpha} distribution and kinematics at unprecedented angular resolution (~<3 arcsec) and resolving power (~12600), with the 1.6 m telescope at the Observatoire du Mont Megantic. The ionized gas distribution follows a complex, large-scale spiral structure, unsurprisingly coincident with the already-known spiral structures of the neutral and molecular gas discs. The kinematical analysis of the velocity field shows that the rotation centre of the H{alpha} disc is distant from the photometric centre by ~168 pc (sky-projected distance) and that the kinematical major-axis position angle and disc inclination are in excellent agreement with photometric values. The H{alpha} rotation curve agrees very well with the HI rotation curves for 0<R<6.5 kpc, but the H{alpha} velocities are 10^-20^ km/s higher for R>6.5 kpc. The reason for this discrepancy is not well understood. The velocity dispersion profile is relatively flat around 16 km/s, which is at the low end of velocity dispersions of nearby star-forming galactic discs. A strong relation is also found between the H{alpha} velocity dispersion and the H{alpha} intensity. Mass models were obtained using the H{alpha} rotation curve but, as expected, the dark matter halo's parameters are not very well constrained since the optical rotation curve only extends out to 8 kpc.2015MNRAS.449.4048Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/449/4048CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/110/2739 : H-alpha emitting regions in M33 (Calzetti+ 1995)J/PASP/111/685 : HII regions of M33. II. (Hodge+, 1999)J/AJ/154/41 : Rotational velocities of M33 (Kam+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/449/4048https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/449/4048http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/449/4048https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/449/4048https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/449/4048http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/449/4048GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/449/4048/tablea1The H{alpha} rotation curve of M33recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRadRadiusarcminphys.angSizefloatVrotRotation velocitykm/sphys.veloc.rotatinte_VrotUncertainty in Vrotkm/sstat.errorintsigmaVelocity dispersionkm/sphys.veloc.dispersioninte_sigmaUncertainty in sigmakm/sstat.errorint