Astron. Astrophys. Suppl. Ser. 139, 393-415
Copenhagen University Astronomical Observatory,
Juliane Maries Vej 32, 2100 Copenhagen Ø, Denmark
Received March 9; accepted July 5, 1999
A detailed description is given of the data analysis leading to the discovery of young massive star clusters (YMCs) in a sample of 21 nearby galaxies. A new useful tool, ishape, for the derivation of intrinsic shape parameters of compact objects is presented, and some test results are shown. Completeness tests for the cluster samples are discussed, and ishape is used to estimate cluster sizes. Half-light radii of 0-20 pc are derived for clusters in 2 of the most cluster-rich galaxies, NGC 1313 and NGC 5236, which is within the range spanned by globular clusters in the Milky Way and by YMCs in the LMC and some starburst galaxies. Photometric data for all clusters, along with positions and estimated half-light radii, are tabulated.
Key words: photometry -- spiral -- star clusters -- techniques: image processing
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