Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..687s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Feb. 1, 1985, p. 687-707. Research supported by th
Astronomy and Astrophysics
Astronomy
36
Astronomical Spectroscopy, Galactic Clusters, Astronomical Catalogs, Balmer Series, Mass To Light Ratios, Radial Velocity, Red Shift, Spectrum Analysis, Starburst Galaxies
Scientific paper
Intermediate dispersion spectra for a sample of faint, (BJ less than 21.5) galaxies in the field of the z = 0.31 cluster AC103 were obtained using a fiber-optic coupler at the Anglo-Australian Telescope. The distribution of blue and red cluster members in the color-absolute magnitude diagram is in good agreement with that predicted from a knowledge of galaxy populations in low-redshift clusters. Two of the blue galaxies exhibit unusually strong Balmer absorption lines similar to the candidate starburst galaxies identified in the cluster surrounding 3C 295. The rest-frame cluster velocity dispersion is 912 + 210 or - 126 km/s from which a global mass-to-light ratio of 90 + or - 24 solar units was derived. The redshift distribution of the 15 non-members is consistent with field models incorporating a mild amount of luminosity evolution, as inferred from the local galaxy number-magnitude counts.
Couch Warrick J.
Ellis Richard S.
Gray Peter M.
Sharples Ray M.
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