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We present a new catalog of 81 ancient globular clusters (GCs) in theearly-type spiral (SB0/a) galaxy NGC 1291. Candidates have been selected fromB,V, and I band images taken with the Hubble Space Telescope, which also reveal17 younger (t < few x 100Myr) clusters. The luminosity function shows a peakedshape similar to that found for GC systems in other spiral and ellipticalgalaxies. The ancient clusters have a bimodal color distribution, withapproximately 65% (35%) of the population having blue (red) colors. The red,presumably metal-rich GCs are more centrally concentrated, as expected for abulge population; while the blue, presumably metal-poor GCs, are more broadlydistributed, consistent with expectations of a halo population. The specificfrequency of GCs in NGC 1291 is higher than found previously in most spiralgalaxies. However, if we consider just the blue subpopulation, we findSn,blue=0.50 +/- 0.06, quite similar to that found for other spirals. Thisresult supports the hypothesis of a universal population of halo GCs inspirals. The fraction of red GCs in NGC 1291, when compared with those found inother galaxies, suggests that these correlate with host galaxy type rather thanwith host galaxy luminosity.

The Ancient Globular Clusters of NGC 1291