J/A+A/684/A214ivo://CDS.VizieR/J/A+A/684/A214doi:10.26093/cds/vizier.36840214CDSZoccali M.Rojas-Arriagada A.Valenti E.Contreras Ramos R.,Valenzuela-Navarro A.Salvo-Guajardo C.2024-11-29T20:01:55Z2024-04-25T12:22:14ZCDS support team

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

cds-question@unistra.frgalaxy-planesmilky-way-galaxyccd-photometryproper-motionsThe nuclear region of the Milky Way, within approximately -1<l<+1 and -0.3<b<+0.3 (i.e., |l|<150pc, |b|<45pc) is believed to host a Nuclear Stellar Disk, co-spatial with the gaseous Central Molecular Zone. Previous kinematical studies detect faster rotation for the stars belonging to the Nuclear Stellar Disk, compared to the surrounding regions. We analyse the rotation velocity of stars at the Nuclear Stellar Disk, and compare them with its analogue in a few control fields just outside this region. We limit our analysis to stars in the Red Clump of the Color Magnitude Diagram, in order to be able to relate their mean de-reddened luminosity with distance along the line of sight. We use a Proper Motion catalogue, obtained from Point Spread Function photometry on VISTA Variables in the Via a Lactea images, to construct maps of the transverse velocity for these stars. We complement our analysis with radial velocities from the 17th data release of the APOGEE survey. We find that the main difference between the Nuclear Stellar Disk region and its surroundings is that at the former we see only stars moving eastwards, that we believe are located in front of the Galactic Center. On the contrary, in every other direction, we see the brightest Red Clump stars moving eastwards, and the faintest ones moving westwards, as expected for a rotating disk. We interpret this observations as produced by the Central Molecular Zone, hiding stars behind itself. What we observe is compatible with being produced just by the absence of the component at the back, without requiring the presence of a cold, fast rotating disk. This component is also not clearly detected in the newest release of the APOGEE catalogue. In other words, we find no clear signature of the Nuclear Stellar Disk as a distinct kinematical component. This work highlights the need for nearby control fields when attempting to characterize the properties of the Nuclear Stellar Disk, as the different systematics affecting this region, compared to nearby ones, might introduce spurious results. Deep, wide field and high resolution photometry of the inner 4 degrees of the Milky Way is needed, in order to understand the structure and kinematics of this very unique region of our Galaxy.2024A&A...684A.214Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/684/A214CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/684/A214https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/684/A214http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/684/A214https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/684/A214https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/684/A214http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/684/A214GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/684/A214/table1 (Photometry and proper motion catalogue in the Nuclear Stellar Disk (NSD) region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/684/A214/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/684/A214/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/684/A214/table1?GETtext/xml+votable180.050000true266.16295905-31.54620450.0055555555555555565/7206-7207 7218 6/28807 28813 28815 28818-28819 28822 28837 28848-28849 28852-28853 28855 28896 288987.952274030004205e-20 1.2934455535160846e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/684/A214?format=asciidefaultJ/A+A/684/A214/table1Photometry and proper motion catalogue in the Nuclear Stellar Disk (NSD) region_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar ID (bNNN_NNN_NNNNN)meta.id;meta.maincharGLON[-2.5/2.5]? Galactic longitudedegpos.galactic.lonnullableindexedGLAT[-1.2/1.2]? Galactic latitudedegpos.galactic.latnullableindexedJmag? J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Error of J-band magnitudemagstat.error;phot.magfloatnullableHmagH-band magnitudemagphot.mag;em.IR.Hfloate_HmagError of H-band magnitudemagstat.error;phot.magfloatKmagK-band magnitudemagphot.mag;em.IR.Kfloate_KmagError of K-band magnitudemagstat.error;phot.magfloatpml? Proper motion component in the direction parallel to the Galactic plane (mu_l)mas/yrpos.pmdoublenullablee_pml? Error on pmlmas/yrstat.errorfloatnullablepmb? Proper motion component in the direction perpendicular to the Galactic plane (mu_b)mas/yrpos.pmdoublenullablee_pmb? Error on pmbmas/yrstat.errorfloatnullable