Mathematics – Logic
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.229..423c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 229, Dec. 1, 1987, p. 423-456. Research supported by th
Mathematics
Logic
352
Astronomical Spectroscopy, Galactic Clusters, Mass Distribution, Spectrum Analysis, Star Formation, Line Spectra, Mass To Light Ratios, Spiral Galaxies, Velocity Distribution
Scientific paper
Intermediate-dispersion spectroscopy for 152 galaxies in the fields of three rich galaxy clusters at z of about 0.31 is presented. In each case, the fraction of blue cluster members is a factor of about 5 greater than that predicted on the bases of a morphology-density relation and color distribution appropriate to spirals in nearby clusters. The nature of this blue galaxy excess is investigated using a spectral systhesis technique and diagnostic diagrams based on colors and line strengths. Most of the blue excess arises from systems which have experienced a burst of star formation between 0.1 and 1.5 Gyr prior to the epoch of observation; in the remainder a substantial burst appears to be still in progress. There is no evidence for any increase in the level of normal spirallike star-formation activity in these clusters or in the number of active nuclei. Velocity dispersions and M/L ratios have been determined for each cluster. A comparison of the distribution of populations in the high-z clusters with the morphological segregation observed in the Coma cluster supports the view that the blue galaxies are progenitors of present-day S0s.
Couch Warrick J.
Sharples Ray M.
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