Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ycat.7145....0t&link_type=abstract
VizieR On-line Data Catalog: VII/145. Originally published in: Cambridge University Press (1988)
Other
6
Galaxy Catalogs
Scientific paper
This compendium is a companion to the Nearby Galaxies Atlas (ref. 29; hereafter NBG Atlas). Data has been accumulated on 2367 galaxies with systemic velocities less than 3000 kilometers/second. Any galaxy was admitted to the catalog if it had a known velocity in 1978 that satisfied the specified limit of 3000 kilometers/second, or if it was subsequently observed to have a suitable velocity in surveys of the entire sky by the author and collaborators (ref. 6, 11, 22).
There are many sources of velocities, so this catalog could potentially be quite heterogeneous. However, two sources dominate. One of these is the magnitude-limited Shapley-Ames sample, which assures the inclusion of all galaxies brighter than 12th magnitude in the blue passband (ref. 25). There are 1053 Shapley-Ames galaxies within the velocity limit. The other source was already mentioned: the all-sky survey in the neutral hydrogen line by the author and collaborators. This survey was undertaken after a complete reinspection of photographic atlases of the sky. This survey was insensitive to gas-deficient systems and has severe incompletion problems at velocities beyond 2000 kilometers/second (discussed in ref. 11). However, the virtue of our survey is homogeneous coverage across the unobscured part of the sky. The neutral hydrogen survey provides 1515 velocities to the catalog. There is some overlap between the two principal sources. It is this cumulative sample that is mapped in the NBG Atlas.
There are three parts to the catalog. The first and by far the largest section (catalog) provides information about each of the 2367 galaxies. One element of that information is a group affiliation, and in a second section (groups) there is a reordered listing that clarifies the composition of each group. The final, very short section (clusters) identifies the rich clusters of galaxies that delineate the supercluster complexes mapped in the last two plates of the NBG Atlas.
The text of the atlas is written at a level that can be appreciated by a wide audience. The material in this catalog and the following description are of a more technical nature. This catalog is intended for an audience of professional and motivated amateur astronomers.
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