Neutral hydrogen in small groups of galaxies.

October 1986 • 1986AJ.....92..742S

Authors • Schneider, S. E. • Helou, G. • Salpeter, E. E. • Terzian, Y.

Abstract • Neutral hydrogen in 36 pairs and small groups of galaxies was studied using the Arecibo radio telescope. Potential groups were selected from the Uppsala General Catalogue of Galaxies of Nilson (1973) by a simple algorithm with the aims of determining or improving redshifts for galaxies in possible groups and of mapping some of the larger galaxies to determine their internal dynamics. The H I spectra are examined in detail and problems of confusion in these and previous observations are addressed. A simple analysis of the groups' mean dynamical mass suggests that the mass determined from the galaxies' rotation is sufficient to bind them, but there may be important unmodeled selection or contamination problems. A simple method for estimating errors of H I velocity measurements is also derived.

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