Other
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..175h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 1, 1984, p. 175-184. Research supported by the Natural Sciences a
Other
45
Astronomical Photography, Galactic Structure, Globular Clusters, Star Distribution, Density Distribution, Elliptical Galaxies, Luminosity, Peculiar Galaxies, Radial Distribution
Scientific paper
Star counts in U, V, and R within about 23 arcmin of the nearby peculiar elliptical galaxy NGC 5128 show 800-900 counted objects in excess of background in the region studied. The cluster system inferred from these data seems to follow an r1/4 law distribution for r greater than or equal to 4 arcmin. Inside this radius it is possible that the clusters are deficient relative to the halo light. Using data from other studies, a cluster-luminosity function over a range of 5 mag has been constructed. It agrees with the Local Group globular-cluster luminosity function over the full range if the distance to NGC 5128 is less than or equal to 4 Mpc. The analysis of the counts suggests total cluster population N t = 1200-1900, specific frequency, S = 3.0-3.2, and distance about 3-4 Mpc. Larger distances are permitted only if the luminosity function is nonstandard; in such a case, then S is much less than 3 or N is much greater than 2000.
Curry P. J.
Harris Gretchen L. H.
Harris Hugh C.
Hesser James Edward
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