We have used deep I -band ( F814W ) images from the HST archive to study the globular cluster systems around the brightest cluster galaxies ( BCGs ) in Abell 262 , 3560 , 3565 and 3742 .
Three of these BCGs have inner dust lanes and peculiar structural features which indicate past histories of low-level interaction and accretion .
The deep I - band WFPC2 images have photometric limits which , for all four galaxies , reach near or just beyond the GCLF turnover point .
Their specific frequencies are 8.24 \pm 1.65 , 4.66 \pm 0.93 , 2.58 \pm 0.52 and 2.62 \pm 0.52 respectively , all within a factor of two of the normal range for giant ellipticals .
We obtain new estimates of the GCLF turnover magnitudes , which are shown to be consistent with an adopted Hubble constant of H _ { 0 } \simeq 70 { km s ^ { -1 } Mpc ^ { -1 } } on the “ Hubble diagram ” of GCLF turnover apparent magnitude versus redshift , on a distance scale where the fundamental GCLF calibrator E galaxies ( M87 and others ) in Virgo are at d = 16 Mpc .