Spectroscopy of globular cluster candidates in the Sculptor group galaxies NGC 253 and 55

We have obtained spectra for 103 published globular cluster candidates in the Sculptor Group galaxies NGC 253 and NGC 55. On the basis of radial velocities and digitized plate images, 14 globular clusters are identied in NGC 253 and one probable globular cluster is identied in NGC 55. The majority of the objects in the sample appear to be background galaxies. We have obtained and analysed COSMOS plate scans of NGC 253 and NGC 55 and use these along with the spectroscopically identied clusters to dene new samples of globular cluster candidates in the two galaxies which should have reduced contamination.

[1]  Ivan R. King,et al.  The structure of star clusters. I. an empirical density law , 1962 .

[2]  H. Macgillivray,et al.  The NGC 5128 globular cluster system - A complete analysis of images using COSMOS , 1984 .

[3]  Ian N. Evans,et al.  Steps toward determination of the size and structure of the broad-line region in active galatic nuclei. 8: an intensive HST, IUE, and ground-based study of NGC 5548 , 1995 .

[4]  L. Costa,et al.  Southern Sky Redshift Survey - The catalog , 1991 .

[5]  T. Armandroff.  The properties of the disk system of globular clusters , 1989 .

[6]  G. Vaucouleurs.  The extragalactic distance scale. IV. Distances of nearest groups and field galaxies from secondary indicators. , 1978 .

[7]  William E. Harris,et al.  A Catalog of Parameters for Globular Clusters in the Milky Way , 1996 .

[8]  S. M. Beard,et al.  The Cosmos system for crowded-field analysis of digitized photographic plate scans. , 1990 .

[9]  J. A. Graham.  The resolution of old red giant stars in the Sculptor group of galaxies , 1982 .

[10]  G. Costa,et al.  Globular clusters in the sculptor group Galaxy NGC 55 , 1982 .

[11]  G. Vaucouleurs.  An expanding association of galaxies , 1959 .

[12]  Mary J. Sandage,et al.  Galaxies and the universe , 1975 .

[13]  W. Liller,et al.  A search for globular clusters around the edge-on spiral galaxy NGC 55 , 1983 .

[14]  W. D. Pence.  A photometric and kinematic study of the barred spiral galaxy NGC 253 , 1978 .

[15]  R. Joseph.  Stars and Stellar Systems Vol 9: Galaxies and the Universe , 1977 .

[16]  W. Harris,et al.  Star Clusters: Saas-Fee Advanced Course 28. Lecture Notes 1998 Swiss Society for Astrophysics and Astronomy , 2000 .