J/A+A/611/A38ivo://CDS.VizieR/J/A+A/611/A38doi:10.26093/cds/vizier.36110038CDSOpitsch M.Fabricius M.H.Saglia R.P.Bender R.Blana M.Gerhard O.2018-09-25T13:18:39Z2018-08-02T14:40:28ZCDS support team

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

cds-question@unistra.frgalaxiesstellar-populationsradial-velocitygalaxy-kinematicsspectroscopyAs the nearest large spiral galaxy, M 31 provides a unique opportunity to study the structure and evolutionary history of this galaxy type in great detail. Among the many observing programs aimed at M 31 are microlensing studies, which require good three-dimensional models of the stellar mass distribution. Possible non-axisymmetric structures like a bar need to be taken into account. Due to M 31's high inclination, the bar is difficult to detect in photometry alone. Therefore, detailed kinematic measurements are needed to constrain the possible existence and position of a bar in M 31. We obtained ~=220 separate fields with the optical integral-field unit spectrograph VIRUS-W, covering the whole bulge region of M 31 and parts of the disk. We derived stellar line-of-sight velocity distributions from the stellar absorption lines, as well as velocity distributions and line fluxes of the emission lines H{beta}, [OIII] and [NI]. Our data supersede any previous study in terms of spatial coverage and spectral resolution. We find several features that are indicative of a bar in the kinematics of the stars, we see intermediate plateaus in the velocity and the velocity dispersion, and correlation between the higher moment h3 and the velocity. The gas kinematics is highly irregular, but is consistent with non-triaxial streaming motions caused by a bar. The morphology of the gas shows a spiral pattern, with seemingly lower inclination than the stellar disk. We also look at the ionization mechanisms of the gas, which happens mostly through shocks and not through starbursts.2018A&A...611A..38Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/611/A38CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/459/2262 : Maps of dust distribution in M31 bulge (Dong+, 2016)J/MNRAS/473/4130 : M31 center emission-line point-like sources (Martin+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/611/A38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/611/A38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/611/A38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/611/A38https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/611/A38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/611/A38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/611/A38/tableb4 (On-sky positions of the individual fiber spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/611/A38/tableb4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/611/A38/tableb4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/611/A38/tableb4?GETtext/xml+votable180.050000true10.684291741.270550.0055555555555555566/2623 2708-2709https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/611/A38?format=asciidefaultJ/A+A/611/A38/tableb5Stellar and nebular emission line kinematic data and fluxes (tables B5-B7 of the paper)e_sigma[OIII]? Error in [OIII] velocity dispersionkm/sstat.errorfloatnullablev[OIII]2? 2nd component [OIII] line velocitykm/sspect.dopplerVelocfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBin[0/6472]? Number of the Voronoi binmeta.id;meta.mainintnullablevstarMean stellar radial velocitykm/sphys.veloc;pos.heliocentricfloate_vstarError of mean stellar radial velocitykm/sstat.errorfloatsigmastarStellar velocity dispersionkm/sphys.veloc.dispersionfloate_sigmastarError of stellar velocity dispersionkm/sstat.errorfloath3starThird Gauss-Hermite momentstat.fit.paramfloate_h3starError in third Gauss-Hermite momentstat.errorfloath4starFourth Gauss-Hermite momentstat.fit.paramfloate_h4starError in fourth Third Gauss-Hermite momentstat.errorfloatv[OIII]? [OIII] line velocitykm/sspect.dopplerVelocfloatnullablee_v[OIII]? Error in [OIII] line velocitykm/sstat.errorfloatnullablesigma[OIII]? [OIII] line velocity dispersionkm/sphys.veloc.dispersionfloatnullablee_v[OIII]2? Error in 2nd component [OIII] velocitykm/sstat.errorfloatnullablesigma[OIII]2? 2nd component [OIII] line velocity dispersionkm/sphys.veloc.dispersionfloatnullablee_sigma[OIII]2? Error in 2nd component [OIII] dispersionkm/sstat.errorfloatnullableFHb? Flux in H{beta} line (1)1e-18W.m**-2phot.flux;em.line.Hbetafloatnullablee_FHb? Error of H{beta} flux (1)1e-18W.m**-2stat.errorfloatnullableF[OIII]? Flux in [OIII] line (1)1e-18W.m**-2phot.flux;em.line.OIII;spect.linefloatnullablee_F[OIII]? Error of [OIII] flux (1)1e-18W.m**-2stat.errorfloatnullableF[NII]? Flux in [NII] line (1)1e-18W.m**-2phot.flux;spect.linefloatnullablee_F[NII]? Error of [NII] flux (1)1e-18W.m**-2stat.errorfloatnullableFHb2? Flux in 2nd component H{beta} line (1)1e-18W.m**-2phot.flux;em.line.Hbetafloatnullablee_FHb2? Error of 2nd component H{beta} flux (1)1e-18W.m**-2stat.errorfloatnullableF[OIII]2? Flux in 2nd component [OIII] line (1)1e-18W.m**-2phot.flux;em.line.OIII;spect.linefloatnullablee_F[OIII]2? Error of 2nd component [OIII] flux (1)1e-18W.m**-2stat.errorfloatnullableF[NII]2? Flux in 2nd component [NII] line (1)1e-18W.m**-2phot.flux;spect.linefloatnullablee_F[NII]2? Error of 2nd component [NII] flux (1)1e-18W.m**-2stat.errorfloatnullableJ/A+A/611/A38/tableb4On-sky positions of the individual fiber spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBin[0/6472]? Number of the Voronoi binmeta.id;meta.mainintnullableRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)pos.eq.dec;meta.mainxposCoordinate, centered on nucleus, +x to Westarcsecpos.cartesian.x;instr.detdoubleyposCoordinate, centered on nucleus, +y to Northarcsecpos.cartesian.y;instr.detdouble