J/ApJ/755/90ivo://CDS.VizieR/J/ApJ/755/90doi:10.26093/cds/vizier.17550090CDSIrons W.T.Lacy J.H.Richter M.J.2014-04-28T11:07:37Z2014-04-09T11:22:08ZCDS support team

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

cds-question@unistra.frinfrared-astronomyspectroscopyh-ii-regionsWe present new observations of the [NeII] emission from the ionized gas in Sgr A West with improved resolution and sensitivity. About half of the emission comes from gas with kinematics indicating it is orbiting in a plane tipped about 25{deg} from the Galactic plane. This plane is consistent with that derived previously for the circumnuclear molecular disk and the northern arm and western arc ionized features. However, unlike most previous studies, we conclude that the ionized gas is not moving along the ionized features, but on more nearly circular paths. The observed speeds are close to, but probably somewhat less than expected for orbital motions in the potential of the central black hole and stars and have a small inward component. The spatial distribution of the emission is well fitted by a spiral pattern. We discuss possible physical explanations for the spatial distribution and kinematics of the ionized gas, and conclude that both may be best explained by a one-armed spiral density wave, which also accounts for both the observed low velocities and the inward velocity component. We suggest that a density wave may result from the precession of elliptical orbits in the potential of the black hole and stellar mass distribution.2012ApJ...755...90Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/755/90CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/534/A117 : NIR polarimetry of sources near SgrA* (Buchholz+, 2011)J/A+A/511/A18 : NIR observations of stars near SgrA* (Schoedel+, 2010)J/ApJ/737/73 : Infrared extinction toward the Galactic Centre (Fritz+, 2011)J/ApJ/699/186 : VLA observations of the Galactic center (Zhao+, 2009)J/ApJ/703/1323 : Spectro. of stars in the Galaxy's nuclear cluster (Do+ 2009)J/A+A/499/483 : NIR obs. of sources in galactic center (Buchholz+, 2009)J/ApJ/642/861 : N-band imaging of the Galactic Center (Viehmann+, 2006)J/A+A/426/81 : Kinematic analysis of the Minispiral (Paumard+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/755/90https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/755/90http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/755/90https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/755/90https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/755/90http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/755/90GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/755/90/fits (List of the 3-D data cube parameters of Sgr A West (from erratum 2013, ApJ, 771, 75))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/755/90/fits?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/755/90/fits?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/755/90/fits?GETtext/xml+votable180.050000true266.418-29.0090.0055555555555555566/28830https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/755/90?format=asciiInfrareddefaultJ/ApJ/755/90/fitsList of the 3-D data cube parameters of Sgr A West (from erratum 2013, ApJ, 771, 75)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[266.418] Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000[-29.009] Declination of center (J2000)degpos.eq.dec;meta.mainScaleScale of the imagearcsec/pixinstr.scaledoubleNx[194] Number of pixels along X-axis (RA)meta.numberintNy[216] Number of pixels along Y-axis (DEC)meta.numberintNz[384] Number of pixels along Z-axis (VELO-LSR)meta.numberintbVLSR[-416.044] Lower limit of LSR velocitykm/sphys.veloc;stat.mindoubleBVLSR[345.36] Upper limit of LSR velocitykm/sphys.veloc;stat.maxfloatdVLSR[1.988] Increment in the LSR velocity (1)km/sspect.resolutionfloatLineSpectral feature ([Ne II])meta.id;spect.linecharsize[62871/62871] Size of the FITS fileKibytephys.size;meta.fitsintfitsDownload the FITS cubemeta.ref.urlcharFileNameName of the FITS file in subdirectory fitsmeta.id;meta.fitschar