Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..795g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 795-812.
Astronomy and Astrophysics
Astronomy
17
Astronomical Photometry, Astronomical Spectroscopy, Galactic Clusters, Luminosity, Red Shift, Astronomical Catalogs, Maximum Likelihood Estimates
Scientific paper
Spectroscopic observations at 360-700 nm and photometric observations in the Gunn g, r, and i bands are reported for Abell 3639. Data obtained using the EFOSC with CCD detectors at the Cassegrain focus of the 3.6-m telescope at ESO during 1987 and 1988 are presented in extensive tables, graphs, and sample spectra and characterized in detail. Ten of 14 cluster-core galaxies studied are identified as cluster members, giving a mean redshift of 0.1496 + or - 0.0027 and a velocity dispersion of sigma = 538 + 212 or - 128 km/sec. No evidence of an extended envelope is found for the dominant galaxy. Investigation of the luminosity function of cluster galaxies down to M(r) = -18 in an area of radius about 500 kpc and elimination of background galaxies on the basis of their position in the color-color diagram gives a total of 105 galaxies in the sample.
Garilli Bianca
Maccagni Dario
Vettolani Giampaolo
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