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Morphologies and stellar populations of galaxies in the core of Abell 2218

Authors :: Sebastián F. Sánchez
Marc Verheijen
Nicolás Cardiel
S. Pedraz
Giovanni Covone
Sánchez, S. F.
Cardiel, N.
Verheijen, M. A. W.
Pedraz, S.
Covone, Giovanni
Source :: E-Prints Complutense: Archivo Institucional de la UCM, Universidad Complutense de Madrid, E-Prints Complutense. Archivo Institucional de la UCM, instname
Publication Year :: 2007
Publisher :: Oxford University Press (OUP), 2007.
Abstract: SUMMARIZED ABSTRACT: We present a study of the stellar populations and morphologies of galaxies in the core of the galaxy cluster Abell 2218. Integral field spectroscopy was obtained using PMAS/PPAK@3.5m CAHA to obtain a complete flux limited sample of cluster members within its field-of-view (~74"X64"). In addition of 31 galaxies with known redshifts in the outer regions, we built up a final sample of 59 spectroscopically confirmed cluster members. Multiban photometry and detailed morphologies were obtained using deep images taken with the HST/ACS camera in the BVRI and z-bands. The CM diagram shows that the E-type galaxies cover the range of brighter and redder colors. A large fraction of spiral galaxies ($\sim$50%) is found. They cover a wide range in colors. This result, together with the distributions of ages, metallicities and masses, indicates that E-type galaxies are more massive and have older stellar populations, while L-type galaxies are less massive and have a wider range of stellar Our results agree with a proposed two-step scenario for the evolution of galaxies in clusters. In addition, an extremely blue merging galaxy system is found at the core, with the nominal redshift of the cluster.<br />Comment: 29 pages, 17 figures, accepted for publishing in MNRAS. (HST/ACS composite image: http://www.caha.es/sanchez/abell2218/BRI_big.jpg)