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Date and Time of the Query: 2018-11-17 T18:15:09 PST
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For refcode 1999AJ....118..197K:
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1999AJ....118..197K HUBBLE SPACE TELESCOPE IMAGING OF GLOBULAR CLUSTERS IN THE EDGE-ON SPIRAL GALAXIES NGC 4565 AND NGC 5907 MARKUS KISSLER-PATIG European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei Munchen, Germany; and University of California Observatories/Lick Observatory, University of California, Santa Cruz, CA 95064; mkissler@eso.org KEITH M. ASHMAN Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045; ashman@kusmos.phsx.ukans.edu STEPHEN E. ZEPF Department of Astronomy, Yale University, New Haven, CT 06520; zepf@astro.yale.edu AND KENNETH C. FREEMAN Mount Stromlo and Siding Spring Observatories, Australian National University, Private Bag, Weston Creek Post Office, 2611 Canberra, ACT, Australia; kcf@mso.anu.edu.au Received 1998 December 28; accepted 1999 March 15 ABSTRACT We present a study of the globular cluster systems of two edge-on spiral galaxies, NGC 4565 and NGC 5907, from WFPC2 images in the F450W and F814W filters. The globular cluster systems of both galaxies appear to be similar to the Galactic globular cluster system. In particular, we derive total numbers of globular clusters of N_GC_(4565) = 204 +/- 38_-53_^+87^ and NGC(5907) = 170 +/- 41_-72_^+47^ (where the first are statistical, the second potential systematic errors) for NGC 4565 and NGC 5907, respectively. This determination is based on a comparison with the Milky Way system, for which we adopt a total number of globular clusters of 180 1 20. The specific frequency of both galaxies is SN ~= 0.6, indistinguishable from the value for the Milky Way. The similarity in the globular cluster systems of the two galaxies is noteworthy, since they have significantly different thick disks and bulge-to-disk ratios. This would suggest that these two components do not play a major role in the building up of a globular cluster system around late-type galaxies. Key words: galaxies: formation-galaxies: individual (NGC 4565, NGC 5907)- galaxies: star clusters
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