Washington Photometry of the Globular Clusters in the Virgo Giant
  Elliptical Galaxy M86
  We present a photometric study of the globular clusters (GCs) in the Virgo
giant elliptical galaxy M86 based on Washington CT1 images. The colors of the
GCs in M86 show a bimodal distribution with a blue peak at (C -T1) = 1.30 and a
red peak at (C -T1) = 1.72. The spatial distribution of the red GCs is
elongated similarly to that of the stellar halo, while that of the blue GCs is
roughly circular. The radial number density profile of the blue GCs is more
extended than that of the red GCs. The radial number density profile of the red
GCs is consistent with the surface brightness profile of the M86 stellar halo.
The GC system has a negative radial color gradient, which is mainly due to the
number ratio of the blue GCs to the red GCs increasing as galactocentric radius
increase. The bright blue GCs in the outer region of M86 show a blue tilt: the
brighter they are, the redder their mean colors get. These results are
discussed in comparison with other Virgo giant elliptical galaxies.
