SUBARU Spectroscopy of the Globular Clusters in the Virgo Giant
  Elliptical Galaxy M86
  We present the first spectroscopic study of the globular clusters (GCs) in
the giant elliptical galaxy (gE) M86 in the Virgo cluster. Using spectra
obtained in the Multi-Object Spectroscopy (MOS) mode of the Faint Object Camera
and Spectrograph (FOCAS) on the Subaru telescope, we measure the radial
velocities for 25 GCs in M86. The mean velocity of the GCs is derived to be vp
= -354+81 -79 km/s, which is different from the velocity of the M86 nucleus
(vgal = -234\pm41 km/s). We estimate the velocity dispersion of the GCs,
{\sigma}p = 292+32-32 km/s, and find a hint of rotation of the M86 GC system. A
comparison of the observed velocity dispersion profiles of the GCs and stars
with a prediction based on the stellar mass profile strongly suggests the
existence of an extended dark matter halo in M86. We also estimate the
metallicities and ages for 16 and 8 GCs, respectively. The metallicities of M86
GCs are in the range -2.0 < [Fe/H] < -0.2 with a mean value of -1.13\pm0.47.
These GCs show a wide age distribution from 4 to 15 Gyr.
