Streaming motions of galaxy clusters within 12 000 km s(-1) - I. New spectroscopic data

We present new spectroscopic data for 532 early-type galaxies, predominantly Abell cluster members with cz < 12 000 km s-1. We tabulate 919 individual measurements, from six observing runs, for recession velocity, cz, central velocity dispersion, σ, and magnesium line-strength indices, Mg2 an...

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Bibliographic Details
Main Authors: Smith, R, Lucey, JR, Hudson, M, Schlegel, D, Davies, R
Format: Journal article
Language:English
Published: 2000
Description
Summary:We present new spectroscopic data for 532 early-type galaxies, predominantly Abell cluster members with cz < 12 000 km s-1. We tabulate 919 individual measurements, from six observing runs, for recession velocity, cz, central velocity dispersion, σ, and magnesium line-strength indices, Mg2 and Mgb. The median estimated error, per measurement, in σ is 5 per cent. The Mg2 line-strength data have median errors of 0.009 mag. The observed scatter between repeat measurements is largely accounted for by photon-counting errors. These data will be employed in forthcoming papers, where they will form part of a merged and standardized catalogue of Fundamental Plane data for use in cluster distance estimates and peculiar velocity analyses.