Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1969w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, June 1991, p. 1969-1982.
Astronomy and Astrophysics
Astronomy
4
Galactic Clusters, Hydrogen, Neutral Gases, Galactic Structure, Interacting Galaxies, Mass To Light Ratios, Optical Properties, Red Shift
Scientific paper
The Arecibo 305-m telescope was used to make neutral hydrogen observations of the poor clusters MKW 7, MKW 9, AWM 1, and AWM 3. The observations are almost complete for MKW 7 and AWM 1 galaxies brighter than 15.7 mag within one-half of a degree of the D or cD galaxy, and for MKW 9 galaxies brighter than 15.7 mag within one degree of the D galaxy. Both the integrated H I profile and the sensitive upper limits of the H I flux density are examined, and 22 new redshifts are reported for the D galaxy. The 18 galaxies closest to the dominant member of the D galaxy have an average hydrogen mass-to-light ratio of 0.20 solar units, with a standard deviation of 0.12. The ratio is lower than that measured for late-type spirals found in loose groups or in isolation, and is similar to the ratio determined for late-type galaxies near the centers of Abell clusters. A correlation between galaxy size and distance from the D or cD galaxy is found in the examination of the MKW-AWM clusters. However, the weak correlation may in fact be that between galaxy size and surface density, or a consequence of the larger members' direct tidal interaction with the dominant galaxy.
Lynch J. R.
Williams Barbara A.
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