The scaling relation of early-type galaxies in clusters

II. Spectroscopic data for galaxies in eight nearby clusters

¹ Osservatorio Astronomico di Padova, Vicolo de'll Osservatorio 5, 35122 Padova, Italy e-mail: [bettoni;fasano;varela]@pd.astro.it
² Instituto de Astrofísica de Andalucía, Consejo Superior de Investigaciones Científicas, Camino Bajo de Huétor 50, Apdo. 3004, 18080 Granada, Spain e-mail: moles@iaa.es
³ Copenhagen University Observatory, The Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, 2100 Copenhagen, Denmark e-mail: per@astro.ku.dk

Received: 1 December 2005
Accepted: 22 February 2006

Abstract

Aims.We present low and intermediate resolution spectroscopic data collected for 152 early type galaxies in 8 nearby clusters with .

Methods.We use low resolution data to produce the redshift and the K-correction for each galaxy, as well as to give their overall spectral energy distribution and some spectral indicators, including the 4000 Å break, the Mg₂ strength and the NaD equivalent width. We have also obtained higher resolution data for early type galaxies in three of the clusters, to determine their central velocity dispersion.

Results.The effect of the resolution on the measured parameters is discussed.

Conclusions.A new accurate systemic redshift and velocity dispersion is presented for four of the surveyed clusters, A98, A3125, A3330, and DC2103-39. We have found that the K-correction values for E/S0 bright galaxies in the given nearby clusters are very similar. We also find that the distribution of the line indicators significantly differs from cluster to cluster.