NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-19 T11:23:00 PDT
Help | Comment | NED Home

For refcode 2007MNRAS.381.1711I:
Retrieve 42 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 2007MNRAS.381.1711I Ages of elliptical galaxies: single- versus multi-population interpretation T. P. Idiart, J. Silk and Jose A. de Freitas Pacheco Abstract. New calibrations of spectrophotometric indices of elliptical galaxies as functions of spectrophotometric indices are presented, permitting estimates of mean stellar population ages and metallicities. These calibrations are based on evolutionary models including a two-phase interstellar medium, infall and a galactic wind. Free parameters were fixed by requiring that models reproduce the mean trend of data in the colour-magnitude diagram as well as in the plane of indices H{beta}-Mg_2_ and Mg_2_-<Fe>. To improve the location of faint ellipticals (M_B_ > -20) in the H{beta}-Mg_2_ diagram, downsizing was introduced. An application of our calibrations to a sample of ellipticals and a comparison with results derived from single stellar population models are given. Our models indicate that mean population ages span an interval of 7-12 Gyr and are correlated with metallicities, which range from approximately half up to three times solar. Key words: galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: ISM
Retrieve 42 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home