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|Southern Isolated Galaxy Triplets|
Seventy-six isolated triple systems of galaxies with declinatiosnδ<-3° were selected using ESO/SERC and POSS-I sky surveydata. The equatorial coordinates, configuration types, angular sizes,component angular separations, component morphological types, totalmagnitudes, and other parameters are reported for each triplet.Radial-velocity estimates are available for all components in 33 of the76 triplets. The median values of the main dynamicalparametersradial-velocity dispersion, mean harmonic radius,absolute magnitudes of member galaxies, and mass-to-luminosityratiosare similar to those obtained earlier for 83 isolatedtriple systems with δ>-3°.
|General study of group membership. II - Determination of nearby groups|
We present a whole sky catalog of nearby groups of galaxies taken fromthe Lyon-Meudon Extragalactic Database. From the 78,000 objects in thedatabase, we extracted a sample of 6392 galaxies, complete up to thelimiting apparent magnitude B0 = 14.0. Moreover, in order to considersolely the galaxies of the local universe, all the selected galaxieshave a known recession velocity smaller than 5500 km/s. Two methods wereused in group construction: a Huchra-Geller (1982) derived percolationmethod and a Tully (1980) derived hierarchical method. Each method gaveus one catalog. These were then compared and synthesized to obtain asingle catalog containing the most reliable groups. There are 485 groupsof a least three members in the final catalog.
|Southern Galaxy Catalogue.|
|Spectroscopic measures of galaxies, their companions, and peculiar galaxies in the southern hemisphere|
Examples of apparent association of galaxies and also of single peculiargalaxies have been drawn from the Catalogue of Southern PeculiarGalaxies and Associations (Arp and Madore, in preparation).Spectroscopic measures are reported for 75 central or peculiar galaxiesand for 97 companion galaxies. Objects are identified by position andillustrated by photographic prints from the UK Schmidt (SRC) survey.Absorption and emission characteristics are tabulated for each spectrum,and heliocentric redshifts are given. The redshifts are calculated to beon the Reference Catalog II system (de Vaucouleurs et al. 1976) towithin plus or minus 50 km/s. The average redshift is repeatable towithin plus or minus 50 km/s. Differential redshifts of objects observedsimultaneously or sequentially can be considerably more accurate.
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