Volume 394, Number 1, October IV 2002
|Page(s)||L15 - L18|
|Published online||04 October 2002|
Letter to the Editor
A metallicity-flattening relation for dwarf elliptical galaxies
Astronomisches Institut, Universität Basel, Venusstrasse 7, 4102 Binningen, Switzerland
Corresponding author: F. D. Barazza, firstname.lastname@example.org
Accepted: 5 September 2002
It is shown that bright cluster dwarf ellipticals follow a relation between metallicity and apparent flattening. Rounder dwarfs tend to be more metal-rich. The evidence is based on colour as well as spectroscopic line-strength data from the literature. The large scatter of dEs around the mean metallicity-luminosity relation, usually ascribed to large observational errors, turns out to be an ellipticity effect. In the magnitude range the metallicity of dEs depends more strongly on ellipticity than luminosity. A possible explanation is that galaxies with masses around suffered a partial blowout of metal-enriched gas along their minor axis, rendering ellipticity a critical parameter for metallicity (De Young & Heckman [CITE]).
Key words: galaxies: general / galaxies: fundamental parameters / galaxies: elliptical / galaxies: dwarf / galaxies: evolution
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.