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J/A+A/335/823     Evolution models of elliptical galaxies. III. (Tantalo+ 1998)

Spectro-photometric evolution of elliptical galaxies. III. Infall models with gradients in mass density and star formation Tantalo R., Chiosi C., Bressan A., Marigo P., Portinari L. <Astron. Astrophys. 335, 823 (1998)> =1998A&A...335..823T (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Models, evolutionary Keywords: galaxies: abundances - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: stellar content Abstract: In 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 121 66 Chemical Models at the Stage of Wind Ejection table6.dat 103 197 Integrated magnitude and colours of galaxy models tables.tex 141 495 LaTeX version of the tables tables.ps 72 1055 Post-Script version of the tables
See also: J/A+A/311/361 : Evolution models of elliptical galaxies. II. (Tantalo+, 1996) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 5 F5.3 solMass M(LT12) Asymptotic mass M{L,T,12} 7- 12 F6.1 --- nu Efficiency of star formation ν(rj/2) 14- 17 F4.2 --- zeta IMF parameter ζ 19- 22 F4.2 Gyr tau Time scale of mass accretion τ(rj/2) 24- 30 F7.5 solMass M(Lt) Value reached by ML,t at the onset of galactic wind 32- 35 F4.2 Gyr Age Age at which the galactic wind occurs, t 37- 41 F5.3 --- G(rt) Dimensionless mass of gas G(rj/2,t) 43- 47 F5.3 --- S(rt) Dimensionless mass of living stars S(rj/2,t) 49- 54 F6.4 Sun Zmax Maximum metallicity, Z(rj/2,t) 56- 61 F6.4 Sun Zmean Mean metallicity, <Z(rj/2,t)> 63- 70 E8.2 solMass/yr Psi Rate of star formation Ψ(rj/2,t) 72- 79 E8.2 --- Omegag Gravitational binding energy of the gas Ωg(rj/2,t) 81- 88 E8.2 10+43J Eg Total thermal energy of this Eg(rj/2_,t) 90- 97 E8.2 10+43J ESNI Contributions to the thermal energy by Type I supernovae 99-106 E8.2 10+43J ESNII Contributions to the thermal energy by Type II supernovae 108-115 E8.2 10+43J ESW Contributions to the thermal energy by stellar winds; 117-121 F5.3 --- r Mid shell fractionary radius rj/2
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 5 F5.3 10+12solMass M(lt12) Asymptotic mass of the model, Ml,t,12 7- 13 F7.2 --- nu Efficiency of star formation, ν(rj/2) 15- 18 F4.2 Gyr tau Time scale of gas accretion, τ(rj/2) 20- 26 F7.5 10+12solMass M(lt) Asymptotic mass of each zone, Ml,t 28- 33 F6.3 Gyr Age Age 35- 41 F7.3 mag Mbol Integrated absolute bolometric of each zone 43- 49 F7.3 mag Mvis Integrated visual magnitudes of each zone 51- 55 F5.3 mag U-B Integrated colours (U-B) 57- 61 F5.3 mag B-V Integrated colours (B-V) 63- 67 F5.3 mag V-R Integrated colours (V-R) 69- 73 F5.3 mag V-I Integrated colours (V-I) 75- 79 F5.3 mag V-J Integrated colours (V-J) 81- 85 F5.3 mag V-H Integrated colours (V-H) 87- 91 F5.3 mag V-K Integrated colours (V-K) 93- 98 F6.3 mag 1550-V Integrated colours (1550-V) 100-103 F4.2 --- Rad Fractionary radii rj/2
Acknowledgements: Rosaria Tantalo References: Bressan et al., Paper I. 1994ApJS...94...63B Tantalo et al., Peper II. 1996, Cat. J/A+A/311/361
(End) Patricia Bauer [CDS] 26-May-1998
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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