Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-24
Chin.J.Astron.Astrophys.6:669-679,2006
Astronomy and Astrophysics
Astrophysics
15 pages, 10 figures, accepted for publication to ChJAA
Scientific paper
We determine relative stellar ages and metallicities mainly for about 80 elliptical galaxies in low and high density environments via the latest binary stellar population (BSP) synthesis model and test a latest hierarchical formation model of elliptical galaxies which adopted the new $\Lambda$CDM cosmology for the first time. The stellar ages and metallicities of galaxies are estimated from two high-quality published spectra line indices, i.e. H$\beta$ and [MgFe]. The results show that elliptical galaxies have stellar populations older than 3.9 Gyr and more metal rich than 0.02. Most of our results are in agreement with predictions of the model: First, elliptical galaxies in denser environment are redder and have older populations than field galaxies. Second, elliptical galaxies with more massive stellar components are redder while have older and more metal rich populations than less massive ones. Third, the most massive galaxies are shown to have the oldest and most metal rich stars. However, some of our results are found to be different with predictions of the galaxy formation model, i.e. the metallicity distributions of low- and high-density elliptical galaxies and the relations relating to cluster-centric distance.
Han Zhanwen
Li Zhongmu
Zhang Fenghui
No associations
LandOfFree
Binary Stellar Population Synthesis Study of Elliptical Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Binary Stellar Population Synthesis Study of Elliptical Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Binary Stellar Population Synthesis Study of Elliptical Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-72188