J/MNRAS/415/2417ivo://CDS.VizieR/J/MNRAS/415/2417doi:10.26093/cds/vizier.74152417CDSAscasibar Y.Sanchez Almeida J.2024-07-14T20:15:42Z2012-04-25T10:38:02ZCDS support team

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

cds-question@unistra.frastronomical-modelsspectroscopyWe identify a spectroscopic sequence of galaxies, analogous to the Hubble sequence of morphological types, based on the Automatic Spectroscopic K-means-based (ASK) classification. Considering galaxy spectra as multidimensional vectors, the majority of the spectral classes are distributed along a well-defined curve going from the earliest to the latest types, suggesting that the optical spectra of normal galaxies can be described in terms of a single affine parameter. Optically bright active galaxies, however, appear as an independent, roughly orthogonal branch that intersects the main sequence exactly at the transition between early and late types.2011MNRAS.415.2417Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/415/2417CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/415/2417https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/415/2417http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/415/2417https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/415/2417https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/415/2417http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/415/2417GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/415/2417/table1*Template spectrum of ASK class 5 and basis vectors {Delta}_T_ and {Delta}_A_ as a function of wavelengthrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wlfloatC5Spectral template of class 5stat.paramdoubleDeltaTBasis vector {Delta}_T_stat.paramdoubleDeltaABasis vector {Delta}_A_stat.paramdoubleMask[0/1] Binary flag indicating whether that particular wavelength is included in the bands used to define the ASK classesmeta.codeint