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Title:
Evolutionary synthesis of galaxies at high spectral resolution with the code PEGASE-HR. Metallicity and age tracers
Authors:
Le Borgne, D.; Rocca-Volmerange, B.; Prugniel, P.; Lançon, A.; Fioc, M.; Soubiran, C.
Affiliation:
AA(Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France ; Department of Astronomy & Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada ), AB(Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France; Université Paris-Sud, 91405 Orsay Cedex, France), AC(CRAL-Observatoire de Lyon, 9 Av. C. André, 69561 Saint-Genis Laval, France), AD(Observatoire de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France), AE(Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France; Université Pierre et Marie Curie, 4 place Jussieu, 75005 Paris, France), AF(Observatoire de Bordeaux, BP 89, 33270 Floirac, France)
Publication:
Astronomy and Astrophysics, v.425, p.881-897 (2004) (A&A Homepage)
Publication Date:
10/2004
Origin:
A&A
Astronomy Keywords:
galaxies: stellar content, galaxies: evolution, galaxies: abundances, techniques: spectroscopic
DOI:
10.1051/0004-6361:200400044
Bibliographic Code:
2004A&A...425..881L

Abstract

We present PEGASE-HR, a new stellar population synthesis program generating high resolution spectra (R=10 000) over the optical range λλ = 400-680 nm. It links the spectro-photometric model of galaxy evolution PEGASE.2 (Fioc & Rocca-Volmerange 1997) to an updated version of the ELODIE library of stellar spectra observed with the 193 cm telescope at the Observatoire de Haute-Provence \citep{ELODIE}. The ELODIE star set gives a fairly complete coverage of the Hertzprung-Russell (HR) diagram and makes it possible to synthesize populations in the range [Fe/H]=-2 to +0.4. This code is an exceptional tool for exploring signatures of metallicity, age, and kinematics. We focus on a detailed study of the sensitivity to age and metallicity of the high-resolution stellar absorption lines and of the classical metallic indices proposed until now to solve the age-metallicity degeneracy. Validity tests on several stellar lines are performed by comparing our predictions for Lick indices to the models of other groups. The comparison with the lower resolution library BaSeL \citep{Lejeune97} confirms the quality of the ELODIE library when used for single stellar populations (SSPs) from 107 to 2×1010 yr. Predictions for the evolved populations of globular clusters and elliptical galaxies are given and compared to observational data. Two new high-resolution indices are proposed around the Hγ line. They should prove useful in the analysis of spectra from the new generation of telescopes and spectrographs.
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