Mg_2-sigma in Early-Type Galaxies and Spiral Bulges

Details Mg_2-sigma in Early-Type Galaxies and Spiral Bulges Mg_2-sigma in Early-Type Galaxies and Spiral Bulges

2001-09-09

arxiv.org/abs/astro-ph/0109139v1

Astronomy and Astrophysics

Astrophysics

7 pages, LaTeX (macro newpasp.sty), 2 figures, to appear in "Chemical Enrichment of Intracluster and Intergalactic Medium", ed

Scientific paper

We analyze new measurements of the Mg_2 central line strength index and velocity dispersion (sigma) for the galaxies of the ENEAR survey. The observations are now complete (da Costa et al. 2000) and the sample contains 1223 early-type galaxies. We also analyze the line strength indices for a sample of 95 spiral bulges (from Sa to Sbc). For the early-type galaxies we find: i) that the Mg_2-sigma relation for Es and S0s are nearly the same, with both populations showing comparable scatter, and ii) a marginal difference in the slope of the Mg_2-sigma relation for cluster and field early-type galaxies. However, we suggest that before interpreting such a difference in the framework of a mass-metallicity relation, it is important to take into account the effects of rotation in the Mg_2-sigma relation. Our preliminary results indicate that once the rotation effects are minimized by choosing a sample containing only slow rotators, the Mg_2-sigma relation is similar both for isolated and clustered galaxies. More data on rotational velocities of early-type galaxies are needed to confirm this result. For spiral bulges, we find that their locus in the Mg_2-sigma plane lies always below the one occupied by early-type galaxies.

Affiliated with

Also associated with

No associations

Rating

Mg_2-sigma in Early-Type Galaxies and Spiral Bulges 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 Mg_2-sigma in Early-Type Galaxies and Spiral Bulges, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mg_2-sigma in Early-Type Galaxies and Spiral Bulges will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-203409