Population synthesis of giant ellipticals - A composite approach

Details Population synthesis of giant ellipticals - A composite approach Population synthesis of giant ellipticals - A composite approach

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....89..291a&link_type=abstract

Astronomy and Astrophysics, vol. 89, no. 3, Sept. 1980, p. 291-295.

Astronomy and Astrophysics

Astrophysics

1

Elliptical Galaxies, Galactic Evolution, Galactic Nuclei, Galactic Structure, Astronomical Models, Luminous Intensity, Star Distribution

Scientific paper

The population in the nucleus of a mean elliptical galaxy is synthesized by a composite approach. Evolutionary tracks parameterize the population, and a static technique based on linear minimization is applied to narrow-band spectrophotometry in order to find the best values of the parameters. Some deficiencies in the theory of post-main-sequence evolution are avoided. A small 'plateau' in the initial luminosity function extending over M(v) of about + 3 is found and explained. The model gives a value of 0.9 for the slope of the initial mass function, if a power law parameterization is assumed. The turnoff group is well determined at G0-5 V. Some difficulties with the giant branch are discussed, and larger values for the corresponding lifetimes set are proposed. Luminosity evolution and cosmological implications are also discussed.

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