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Date and Time of the Query: 2019-08-22 T20:44:31 PDT
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For refcode 1992PASP..104.1220B:
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
1992PASP..104.1220B Detection of the Globular-Cluster population Around NGC 7814 GREGORY D. BOTHUN Department of Physics, University of Oregon, Eugene, Oregon 97403 Electronic mail: nuts@moo.uoregon.edu HUGH C. HARRIS U. S. Naval Observatory, Flagstaff Station, P. O. Box 1149, Flagstaff Arizona 86002 Electronic mail: harris@nofs.navy.mil JAMES E. HESSER Dominion Astrophysical Observatory, Herzberg Institute for Astrophysics, National Research Council of Canada, 5071 W Saanich Rd., RR 5 Victoria, B.C. V8X 4M6 Canada Electronic mall: hesser@dao.nrc.ca Received 1992 July 6; accepted 1992 August 28 ABSTRACT. We report the statistical detection of 120+/-25 globular clusters in fields surrounding the edge-on S0_3_ galaxy NGC 7814. Counts of objects are made to V = 24.5 and reach at least the peak of the globular-cluster luminosity function (GCLF). The bulge of NGC 7814 is of moderate luminosity and is highly flattened with an axial ratio of b/a =0.48. Counts made from 0.5'-5.0' radius in concentric rings of width 0.5' show a clear detection of excess objects relative to the background in each annulus. Correcting for incompleteness in both magnitude and areal coverage yields a total cluster population of 498+/-164 within this region. We are thus confident that we have a strong detection of the globular-cluster system (GCS) of NGC 7814. Accounting for the presence of clusters that we could not detect in the inner few kpc and those that might lie outside our survey area would likely increase the total population by a factor of 2. At our assumed distance of (m-M) = 30.48, the specific frequency (S) of globulars is 7.6+/-3.2. The intrinsic GCLF for NGC 7814 is very poorly determined from these data but may indicate a distance 1 mag further away, in which case, S would be 5.2+/-2.2. These values of S are typical for elliptical galaxies but are rather high compared to those of spirals. The radial distribution of globular-cluster candidates does not fall off as fast as the halo light. Excess counts in a field not centered on the minor axis can only be reconciled with the rest of the data if the GCS of NGC 7814 is highly flattened.
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