Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199...13m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. 13-28.
Astronomy and Astrophysics
Astrophysics
81
Astronomical Photometry, Astronomical Spectroscopy, Galactic Clusters, Galactic Evolution, Starburst Galaxies, Charge Coupled Devices, Luminosity, Signal To Noise Ratios
Scientific paper
Photometric and spectroscopic observations of the distant galactic cluster Abell 370 are reported, including BVR photometry of 330 objects and low resolution spectra of 34 member galaxies. The mean cluster redshift and the line-of-sight velocity dispersion determined from the spectra are 0.374 and 1350 km/s respectively. The cluster is dominated by two giant ellipticals, and presents the same richness, X-ray luminosity, and segregation of luminosity and color as the Coma cluster. A modest Butcher-Oemler effect is confirmed in A370 on the basis of the spectra. Analysis of the spectral types leads to the determination of an unusually high fraction of star-forming galaxies for such a rich cluster: about 50 percent within the central Mpc and over 2.5 mag, compared to 3 percent for the Coma cluster.
Fort Bernard
Mathez Guy
Mellier Yannick
Soucail Genevieve
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