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|HI-observations of galaxies in the Virgo cluster of galaxies. I - The data|
New H I-data for a large number of bright galaxies inside the 10 degradius area of the Virgo cluster of galaxies have been obtained with the100 m radiotelescope at Effelsberg. A total of 234 galaxies was observedfor the first time. Among them, 53 have been detected providing newaccurate radial velocities. Data from the literature have been compiled.Together with the new data, they form a (nearly homogeneous) set of H Iobservations for more than 450 galaxies.
|Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area.|
The present catalog of 2096 galaxies within an area of about 140 sq degapproximately centered on the Virgo cluster should be an essentiallycomplete listing of all certain and possible cluster members,independent of morphological type. Cluster membership is essentiallydecided by galaxy morphology; for giants and the rare class of highsurface brightness dwarfs, membership rests on velocity data. While 1277of the catalog entries are considered members of the Virgo cluster, 574are possible members and 245 appear to be background Zwicky galaxies.Major-to-minor axis ratios are given for all galaxies brighter than B(T)= 18, as well as for many fainter ones.
|Low surface brightness spiral galaxies. I - Neutral hydrogen content and location in the infrared Fisher-Tully diagram|
Over the past three years, a survey of spiral galaxies characterized bydisks of unusually low surface brightness (LSB) has been conducted.These LSB spiral galaxies have luminosities in the range from -20 to -17(MB), and have projected central disk surface brightness valuesapproximately three times smaller, on average, than normal spirals inthe same luminosity range. Knowledge of the gas content of LSBs isimportant in connection with the study of processes which influence starformation, because the relative gas and stellar content of a galaxyprovides one indication of the degree to which star formation hasproceeded. Consequently, as a first step toward understanding of theconsidered systems, an H I survey of the available LSB sample wasconducted. The results of this survey are reported.
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