Luminosity functions of globular clusters in five nearby spiral galaxies using <i>HST</i>/ACS images

We here present the luminosity function (LF) of globular clusters (GCs) in five nearby spiral galaxies using samples GC candidates selected Hubble Space Telescope mosaic images F435W, F555W and F814W filters. Our search, which surpasses fractional area covered by all previous searches these galaxies, has resulted detection 158 M81, 1123 M101, 226 NGC4258, 293 M51 173 NGC628. The LFs constructed from this dataset, after correcting for relatively small contamination reddened young clusters, are log-normal nature, was hitherto established only Milky Way (MW) Andromeda among galaxies. magnitude at turn-over (TO) corresponds to Mv(TO)=-7.41+/-0.14 four with types Sc or earlier, excellent agreement Mv(TO)=-7.40+/-0.10 MW. TO is equivalent a mass ~3x10^5 Msun an old, metal-poor population. Mv(TO) fainter ~1.16 fifth galaxy, type Scd. dependence on implies that GCs early-type spirals classical GCs, have universal TO, whereas population late-type dominated old disk general less massive. radial density distribution our sample follows S\'ersic exponential power-law indices, effective radii 4.0-9.5 kpc. mean specific frequency 1.10+/-0.24, incompleteness factors.