SIMBAD references

2004ApJ...609L..45C - Astrophys. J., 609, L45-L48 (2004/July-2)

On the environmental dependence of the cluster galaxy assembly timescale.

CARRETERO C., VAZDEKIS A., BECKMAN J.E., SANCHEZ-BLAZQUEZ P. and GORGAS J.

Abstract (from CDS):

We present estimates of CN and Mg overabundances with respect to Fe for early-type galaxies in eight clusters over a range of richness and morphology. Spectra were taken from the Sloan Digital Sky Survey Data Release 1 and from William Hershel Telescope and Centro Astronómico Hispano-Alemán observations. Abundances were derived from absorption lines and single-burst population models, by comparing galaxy spectra with appropriately broadened synthetic model spectra. We detect correlations between the [Mg/CN] and [CN/Fe] values and the cluster X-ray luminosity. No correlation is observed for [Mg/Fe]. We also see a clear trend in the richness and morphology of the clusters. This is interpreted as giving varying formation timescales for CN, Mg, and Fe and a varying star formation history in early-type galaxies as a function of their environment: intermediate-mass early-type galaxies in more massive clusters are assembled on shorter timescales than in less massive clusters, with an upper limit of ∼1 Gyr.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Galaxies: Abundances - Galaxies: Clusters: General - Galaxies: Formation - Galaxies: Stellar Content - X-Rays: Galaxies: Clusters

Simbad objects: 8

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2004ApJ...609L..45C and select 'bookmark this link' or equivalent in the popup menu


2020.02.27-19:54:56

© Université de Strasbourg/CNRS

    • Contact