|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Mg_2-sigma in Early-Type Galaxies and Spiral Bulges | | C. Chiappini
; P.S. Pellegrini
; C. Rite
; M.A.G. Maia
; R. Ogando
; B. Ramos
; R.P. Schiavon
; C.N.A. Willmer
; L. da Costa
; M. Bernardi
; M.V. Alonso
; G. Wegner
; | | Date: |
9 Sep 2001 | | Subject: | astro-ph | | Affiliation: | 2 and 3), L. da Costa (2 and 4), M. Bernardi , M.V. Alonso , G. Wegner ( OAT, Triste, Italy, ON, Rio de Janeiro, Brazil, UCO/Lick, Univ. of California, USA, ESO, Germany, Univ. of Chicago, USA, Observatorio Astronomico di Cardoba, Cordoba, Argen | | Abstract: | 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. | | Source: | arXiv, astro-ph/0109139 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER