SIMBAD references

2009MNRAS.396.2103M - Mon. Not. R. Astron. Soc., 396, 2103-2123 (2009/July-2)

The anatomy of the NGC5044 group - II. Stellar populations and star formation histories.


Abstract (from CDS):

The distribution of galaxy properties in groups and clusters holds important information on galaxy evolution and growth of structure in the Universe. While clusters have received appreciable attention in this regard, the role of groups as fundamental to formation of the present-day galaxy population has remained relatively unaddressed. Here, we present stellar ages, metallicities and α-element abundances derived using Lick indices for 67 spectroscopically confirmed members of the NGC5044 galaxy group with the aim of shedding light on galaxy evolution in the context of the group environment.

We find that galaxies in the NGC5044 group show evidence for a strong relationship between stellar mass and metallicity, consistent with their counterparts in both higher and lower mass groups and clusters. Galaxies show no clear trend of age or α-element abundance with mass, but these data form a tight sequence when fitted simultaneously in age, metallicity and stellar mass. In the context of the group environment, our data support the tidal disruption of low-mass galaxies at small group-centric radii, as evident from an apparent lack of galaxies below ∼109M within ∼100kpc of the brightest group galaxy. Using a joint analysis of absorption- and emission-line metallicities, we are able to show that the star-forming galaxy population in the NGC5044 group appears to require gas removal to explain the ∼1.5dex offset between absorption- and emission-line metallicities observed in some cases. A comparison with other stellar population properties suggests that this gas removal is dominated by galaxy interactions with the hot intragroup medium.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): galaxies: clusters: individual: NGC5044 group - galaxies: distances and redshifts - galaxies: evolution - galaxies: formation - galaxies: fundamental parameters

Simbad objects: 66

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2009MNRAS.396.2103M and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact