J/MNRAS/462/3376ivo://CDS.VizieR/J/MNRAS/462/3376doi:10.26093/cds/vizier.74623376CDSThompson G.P.Ryan S.G.Sibbons L.F.2024-08-16T20:18:36Z2018-07-03T08:16:12ZCDS support team

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

cds-question@unistra.frgalaxiescarbon-starsgiant-starsradial-velocityUsing spectra taken with the AAOmega spectrograph, we measure the radial velocities of over 100 stars, many of which are intermediate age carbon stars, in the direction of the dwarf irregular galaxy NGC 6822. Kinematic analysis suggests that the carbon stars in the sample are associated with NGC 6822, and estimates of its radial velocity and galactic rotation are made from a star-by-star analysis of its carbon star population. We calculate a heliocentric radial velocity for NGC 6822 of -51+/-3km/s and show that the population rotates with a mean rotation speed of 11.2+/-2.1km/s at a mean distance of 1.1kpc from the galactic centre, about a rotation axis with a position angle of 26{deg}+/-13{deg}, as projected on the sky. This is close to the rotation axis of the HI gas disc and suggests that NGC 6822 is not a polar ring galaxy, but is dynamically closer to a late-type galaxy. However, the rotation axis is not aligned with the minor axis of the AGB isodensity profiles and this remains a mystery.2016MNRAS.462.3376Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/462/3376CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/832 : C star population in NGC 6822 (Letarte+, 2002)J/A+A/540/A135 : AGB population of NGC 6822 (Sibbons+, 2012)J/A+A/574/A102 : AGB candidates in NGC 6822 (Sibbons+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/462/3376https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/462/3376http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/462/3376https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/462/3376https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/462/3376http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/462/3376GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/462/3376/table1 (Individual results for objects meeting the criteria (hght>=0.2, -200km/s<=HV<=+200km/s))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/462/3376/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/462/3376/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/462/3376/table1?GETtext/xml+votable180.050000true296.23-14.860.0055555555555555565/7429 6/29713 29715 297242.367228618189496e-19 2.6706780932288093e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/462/3376?format=asciidefaultJ/MNRAS/462/3376/table1Individual results for objects meeting the criteria (hght>=0.2, -200km/s<=HV<=+200km/s)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFibreFibre number (1)meta.idintIDTarget identifier (1)meta.id;meta.mainintRAJ2000Right ascension (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)degpos.eq.dec;meta.mainImag? I-band magnitude of C-type AGBs in the inner region from the catalogue of Letarte et al. (2002, Cat. J/AJ/123/832)magphot.mag;em.opt.IfloatnullableDistDistance of the object from the putative galactic centre (2)kpcpos.distancefloatPClassPhotometric classification (3)meta.code.classcharSClassSpectroscopic classification (1)meta.code.classcharSNR1? SNR in the band 8560-8650{AA} for the night of 2011 August 30stat.snrintnullablehght1[0.2/0.84]? Strength of the cross-correlation function for the night of 2011 August 30stat.correlationfloatnullableHV1? Heliocentric radial velocity returned from fxcor for the night of 2011 August 30km/sspect.dopplerVeloc;pos.heliocentricintnullablee_HV1? rms uncertainty on HV1km/sstat.errorintnullableSNR2? NR in the band 8560-8650{AA} for the night of 2011 August 31stat.snrintnullablehght2[0.21/0.89]? Strength of the cross-correlation function for the night of 2011 August 31stat.correlationfloatnullableHV2? Heliocentric radial velocity returned from fxcor for the night of 2011 August 31km/sspect.dopplerVeloc;pos.heliocentricintnullablee_HV2? rms uncertainty on HV2km/sstat.errorintnullableFlag[CM] flag showing which objects were used in the composite templates (4)meta.code.errorchar