J/A+A/707/A302ivo://CDS.VizieR/J/A+A/707/A302CDSPacheco-Arias J.Amram P.Epinat B.Mercier W.2026-03-16T09:39:22Z2026-03-16T10:38:21ZCDS support team

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

cds-question@unistra.frgalaxiesgalaxy-classification-systemsvisible-astronomyThe two-dimensional spatial distribution of stellar specific angular momentum (sAM) within galaxies has never been analyzed to date. We seek to identify the morpho-kinematics of this property and its correlation with the total stellar sAM (j*) and the total stellar mass (M*) of late-type galaxies in the local universe. We estimate the two-dimensional distribution of stellar sAM for 30 spiral and irregular galaxies, mostly located in nearby low-density environments, part of the Gassendi H{alpha} survey of SPirals (GHASP). To do so, we produce for the first time, high-resolution stellar sAM surface density (sAMSD) maps by using a formalism which combines the 3.4um WISE photometry with H{alpha} velocity fields and rotation curves. The features of these new maps are quantified using standard non-parametric morphological indicators such as concentration, asymmetry, and smoothness, augmented by two additional coefficients that respectively measure the degree of similarity to an axisymmetric Freeman disc and the prominence of bi-symmetric substructures within the stellar sAMSD space. Each galaxy in our sample is classified into one of the five new morpho-kinematic categories proposed in this study: j*- ring, j*- spiral, j*- bar, j*- clump and j*- irregular. These classes are named after the predominant galactic substructure of their stellar sAMSD map and form a new classification scheme that combines both morphological characteristics and dynamic properties. For 14 galaxies, the morphological classification does not coincide with the corresponding morpho-kinematic category. As expected, there is a high correlation between j* and M* for our sample. Similarly, our galaxies exhibit a correlation between j* and their star formation rate, and between j* and their total mass. The mean j* and M* are distributed along different regions along the Fall relation for all j*- types, although there is a considerable scatter within each type. There is a link between the two-dimensional distribution of stellar sAMSD and j*. The location of the different j*- types in the j*-M* diagram could indicate a morpho-kinematic evolution of late-type galaxies within the hierarchical paradigm of galaxy formation. The physical mechanisms capable of modifying the shape of galaxies in the stellar sAMSD space seem to be related with the stability of the galactic disc. The spatial redistribution of angular momentum for low-mass late-type galaxies may be driven by a combination of feedback, dynamical friction, shock waves and resonances, while the quasi-stationary rotating density wave can be responsible for the aforementioned process in the massive spirals.2026A&A...707A.302Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A302CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/707/A302https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/707/A302http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/707/A302https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/707/A302https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/707/A302http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/707/A302GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/707/A302/tablea1 (Galaxy parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/707/A302/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A302/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A302/tablea1?GETtext/xml+votable180.050000true36.819633.5790.005555555555555556Cone search capability for table J/A+A/707/A302/list (List of fits maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/707/A302/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A302/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A302/list?GETtext/xml+votable180.050000true236.3709162.313750.0055555555555555566/2311 2320 3516 3860 5581 5596 5639 5710 6619 6623 6948 7110 7303 7957 9869 10841-10842 10935 10976 11127 11389 11443 11448 11566 11582 11639 11649 12047 12122 13162 13472 13489-13490 15592-15593 20270 28155 28496https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/707/A302?format=asciiOpticaldefaultJ/A+A/707/A302/table1*Average parameters by morpho-kinematic categoryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClassMorpho-kinematic categorymeta.code.classcharNgalNumber of galaxies in each categorymeta.numberintTtypeMean morphological type codemeta.code;src.morph.typefloate_Ttype1-sigma standard deviation of Ttypemeta.notefloatlogMstarMean stellar mass (log10)log(solMass)phys.massfloate_logMstar1-sigma standard deviation of logMstarlog(solMass)stat.errorfloatlogjstarMean stellar specific angular momentum (log10)log(kpc.km.s**-1)phys.angMomentum;stat.meanfloate_logjstar1-sigma standard deviation of logjstarlog(kpc.km.s**-1)stat.errorfloatR2Mean ringness parametersrc.morph.paramfloate_R21-sigma standard deviation of R2stat.errorfloatA2Mean bar predominance parametersrc.morph.paramfloate_A21-sigma standard deviation of A2stat.errorfloatCMean concentration indexmeta.code;spect.index;stat.meanfloate_C1-sigma standard deviation of Cstat.errorfloatAMean asymmetry indexmeta.code;spect.index;stat.meanfloate_A1-sigma standard deviation of Astat.errorfloatSMean smoothness indexsrc.morph.paramfloate_S1-sigma standard deviation of Sstat.errorfloatJ/A+A/707/A302/tablea1Galaxy parametersSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintUGCName of the galaxy in the UGC cataloguemeta.id;meta.mainintMTypeMorphological type from NEDsrc.morph.typecharRAJ2000Right ascension of the photometric centre (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declination of the photometric centre (J2000) (1)degpos.eq.dec;meta.mainInclKinematic inclination (2)degsrc.orbital.inclinationinte_InclKinematic inclination errordegstat.errorintPAKinematic position angle (2)degpos.posAnginte_PAKinematic position angle errordegstat.errorintn_PANote on PA (3)meta.notecharDDistance to the galaxy from Epinat et al. (2008)Mpcpos.distancefloatRmaxMaximum radius (4)kpcphys.size.radius;stat.maxfloatn_RmaxNote on Rmax (5)meta.notecharlogMstarStellar mass computed using Eq. (8) (log10)log(solMass)phys.massfloate_logMstarStellar mass computed using Eq. (8) (log10) errorlog(solMass)stat.errorfloatlogjstarTotal stellar specific angular momentum computed using Eq. (6) (log10)log(kpc.km.s**-1)phys.angMomentum;meta.modelledfloate_logjstarTotal stellar specific angular momentum computed using Eq. (6) (log10) errorlog(kpc.km.s**-1)stat.errorfloatJ/A+A/707/A302/tablee1*Morpho-kinematic metricsCConcentration of the stellar sAMSD mapmeta.notefloatAAsymmetry of the stellar sAMSD mapspect.line.asymmetry;obs.fieldfloatSSmoothness of the stellar sAMSD mapsrc.morph.paramfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintUGCName of the galaxy in the UGC cataloguemeta.id;meta.mainintMKtypeMorpho-kinematic typemeta.notecharR2Ringness of the stellar sAMSD mapsrc.morph.paramfloatA2Bar predominance of the stellar sAMSD mapsrc.morph.paramfloatJ/A+A/707/A302/listList of fits mapsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintUGCName of the galaxy in the UGC cataloguemeta.id;meta.mainintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar