J/A+A/428/877ivo://CDS.VizieR/J/A+A/428/877doi:10.26093/cds/vizier.34280877CDSKrajnovic D.Jaffe W.2005-03-05T07:44:35Z2005-03-05T08:44:05ZCDS support team

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

cds-question@unistra.frgalaxiesgalaxy-kinematicsspectroscopyWe present observations of four nearby early-type galaxies previously known (Rest et al., 2001AJ....121.2431R) to have nuclear stellar disks using two instruments on-board the Hubble Space Telescope. We observed NGC 4128, NGC 4612, and NGC 5308 with the Wide Field Planetary Camera 2, and the same three galaxies, plus NGC 4570, with the Space Telescope Imaging Spectrograph. We have detected a red nucleus in NGC 4128, a blue nucleus in NGC 4621, and a blue disk in NGC 5308. Additionally, we have discovered a blue disk-like feature with position angle ~15{deg} from the major axis in NGC 4621. In NGC 5308 there is evidence for a blue region along the minor axis. We discovered a blue transient on the images of NGC 4128 at position 0.14" west and 0.32" north from the nucleus. The extracted kinematic profiles belong to two groups: fast (NGC 4570 and NGC 5308) and kinematically disturbed rotators (NGC 4128 and NGC 4621). We report the discovery of a kinematically decoupled core in NGC 4128. Galaxies have mostly old (10-14Gyr) stellar populations with large spread in metallicities (sub- to super-solar). We discuss the possible formation scenarios, including bar-driven secular evolution and the influence of mergers, which can explain the observed color and kinematic features.2004A&A...428..877Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/428/877CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/428/877https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/428/877http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/428/877https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/428/877https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/428/877http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/428/877GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/428/877/tablea1Measured kinematics and line-strengths for observed galaxies using full spectral region in the fitrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNGCNGC number of the objectintRadiusRadius of measurementarcsecfloatVelMean velocitykm/sinte_VelMean velocity errorkm/sintsigmaVelocity dispersionkm/sinte_sigmaVelocity dispersion errorkm/sintMgbMgb line-strength0.1nmfloate_MgbMgb line-strength error0.1nmfloatFe5270Fe5270 line-strength0.1nmfloate_Fe5270Fe5270 line-strength error0.1nmfloatJ/A+A/428/877/tablea2Measured kinematics and line-strengths for observed galaxies excluding Mgb region from the fitNGCNGC number of the objectintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intRadiusRadius of measurementarcsecfloatVelMean velocitykm/sinte_VelMean velocity errorkm/sintsigmaVelocity dispersionkm/sinte_sigmaVelocity dispersion errorkm/sintMgbMgb line-strength0.1nmfloate_MgbMgb line-strength error0.1nmfloatFe5270Fe5270 line-strength0.1nmfloate_Fe5270Fe5270 line-strength error0.1nmfloat