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We present results from a wide-field imaging study of the globular cluster(GC) systems of a sample of edge-on, Sb-Sc spiral galaxies ~7-20 Mpc away. Thisstudy is part of a larger survey of the ensemble properties of the GCpopulations of giant galaxies. We imaged the galaxies in BVR filters withlarge-format CCD detectors on the WIYN 3.5-m telescope, to projected radii of~20-40 kpc. For four galaxies (NGC 2683, NGC 3556, NGC 4157, and NGC 7331), wequantify the radial distributions of the GC systems and estimate the totalnumber, luminosity- and mass-normalized specific frequencies (S_N and T), andblue (metal-poor) fraction of GCs. A fifth galaxy (NGC 3044) was apparently toodistant for us to have detected its GC system. Our S_N for NGC 2683 is 2.5times smaller than the previously-published value, likely due in part toreduced contamination from non-GCs. For the spiral galaxies analyzed for thesurvey to date, the average number of GCs is 170+/-40 and the weighted meanvalues of S_N and T are 0.8+/-0.2 and 1.4+/-0.3. We use the survey data toderive a relationship between radial exent of the GC system and host galaxymass over a factor of 20 in mass. Finally, we confirm the trend, identified inprevious survey papers, of increasing specific frequency of metal-poor GCs withincreasing galaxy mass. We compare the data with predictions from a simplemodel and show that carefully quantifying the numbers of metal-poor GCs ingalaxies can constrain the formation redshifts of the GCs and their hostgalaxies.

Global Properties of the Globular Cluster Systems of Four Spiral Galaxies