J/A+A/335/823ivo://CDS.VizieR/J/A+A/335/823doi:10.26093/cds/vizier.33350823CDSTantalo R.Chiosi C.Bressan A.Marigo P.Portinari L.1998-08-05T19:41:54Z1998-08-05T19:41:26ZCDS support team

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

cds-question@unistra.frgalaxiesphotometrystellar-evolutionary-modelsIn this study we present a simple model of elliptical galaxies aimed at interpreting the gradients in colours and narrow band indices observed across these systems. Salient features of the model are the gradients in mass density and star formation and infall of primordial gas aimed at simulating the collapse of a galaxy into the potential well of dark matter. Adopting a multi-zone model we follow in detail the history of star formation, gas consumption, and chemical enrichment of the galaxy and also allow for the occurrence of galactic winds according to the classical supernova (and stellar winds) energy deposit. The outline of the model, the time scale of gas accretion and rate of star formation as a function of the galacto-centric distance in particular, seek to closely mimic the results from Tree-SPH dynamical models. Although some specific ingredients of the model can be questioned from many points of view (of which we are well aware), the model has to be considered as a gross tool for exploring the consequences of different recipes of gas accretion and star formation in which the simple one-zone scheme is abandoned. With the aid of this model we discuss the observational data on the gradients in metallicity, colours, and narrow band indices across elliptical galaxies.1998A&A...335..823Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/335/823CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/311/361 : Evolution models of elliptical galaxies. II. (Tantalo+, 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/335/823https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/335/823http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/335/823https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/335/823https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/335/823http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/335/823GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/335/823/table4Chemical Models at the Stage of Wind EjectionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM(LT12)Asymptotic mass M_{L,T,12}_solMassphys.massfloatnuEfficiency of star formation {nu}(r_j/2_)stat.paramfloatzetaIMF parameter {zeta}stat.fit.paramfloattauTime scale of mass accretion {tau}(r_j/2_)Gyrtime.scalefloatM(Lt)Value reached by M_L,t_ at the onset of galactic windsolMassphys.massdoubleAgeAge at which the galactic wind occurs, t_g{omega}_Gyrtime.agefloatG(rt)Dimensionless mass of gas G(r_j/2_,t)phys.mass;arith.ratiofloatS(rt)Dimensionless mass of living stars S(r_j/2_,t)phys.mass;arith.ratiofloatZmaxMaximum metallicity, Z(r_j/2_,t)Sunphys.abund.ZfloatZmeanMean metallicity, <Z(r_j/2_,t)>Sunphys.abund.ZfloatPsiRate of star formation {Psi}(r_j/2_,t)solMass/yrphys.SFRdoubleOmegagGravitational binding energy of the gas {Omega}_g_(r_j/2_,t)phys.energydoubleEgTotal thermal energy of this E_g(r_j/2_,t)1e+43Jphys.energydoubleESNIContributions to the thermal energy by Type I supernovae1e+43Jphys.energydoubleESNIIContributions to the thermal energy by Type II supernovae1e+43Jphys.energydoubleESWContributions to the thermal energy by stellar winds;1e+43Jphys.energydoublerMid shell fractionary radius r_j/2_phys.size.radius;arith.ratiofloatJ/A+A/335/823/table6Integrated magnitude and colours of galaxy modelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM(lt12)Asymptotic mass of the model, M_l,t,12_1e+12solMassphys.massfloatnuEfficiency of star formation, {nu}(r_j/2_)stat.paramfloattauTime scale of gas accretion, {tau}(r_j/2_)Gyrtime.scalefloatM(lt)Asymptotic mass of each zone, M_l,t_1e+12solMassphys.massdoubleAgeAgeGyrtime.agefloatMbolIntegrated absolute bolometric of each zonemagphys.magAbs.bolfloatMvisIntegrated visual magnitudes of each zonemagphot.mag;em.opt.VfloatU-BIntegrated colours (U-B)magphot.color;em.opt.U;em.opt.BfloatB-VIntegrated colours (B-V)magphot.color;em.opt.B;em.opt.VfloatV-RIntegrated colours (V-R)magphot.color;em.opt.V;em.opt.RfloatV-IIntegrated colours (V-I)magphot.color;em.opt.V;em.opt.IfloatV-JIntegrated colours (V-J)magphot.color;em.opt.V;em.IR.JfloatV-HIntegrated colours (V-H)magphot.color;em.opt.V;em.IR.HfloatV-KIntegrated colours (V-K)magphot.color;em.opt.V;em.IR.Kfloat1550-VIntegrated colours (1550-V)magphot.color;em.UV;em.optfloatRadFractionary radii r_j/2_phys.size.radius;arith.ratiofloat