The Shapley 8 cluster of galaxies - Redshifts and dynamics

Details The Shapley 8 cluster of galaxies - Redshifts and dynamics The Shapley 8 cluster of galaxies - Redshifts and dynamics

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..581m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, April 1, 1987, p. 581-590. SERC-supported research

Physics

Optics

24

Galactic Clusters, Galactic Evolution, Galactic Rotation, Mass To Light Ratios, Red Shift, Abundance, Astronomical Spectroscopy, Fiber Optics

Scientific paper

The authors have measured redshifts for 40 galaxies within a 5 arcmin radius of the core of the galaxy cluster Shapley 8, SC 1325-311, using the multi-object fibre-optic system at the AAT. They discuss the structure and dynamics of the cluster using the 50 redshifts now available together with ubri photographic photometry previously obtained from measurements of UK Schmidt Telescope plates. It has a mean heliocentric redshift z = 0.04780, and a line-of-sight velocity dispersion of 983 km s-1. The core mass-to-light ratio is typical of rich clusters (M/Lb = 196 solar units). The spectra also show a broad-band colour-metallicity relation consistent with that expected for early-type galaxies.

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