  [OIII] lambda 5007AA emission lines of 16 intracluster planetary nebulae
candidates in the Coma cluster were detected with a Multi-Slit Imaging
Spectroscopy (MSIS) technique using FOCAS on the Subaru telescope. The
identification of these faint emission sources as PNe is supported by (i) their
point-like flux distribution in both space and wavelength, with tight limits on
the continuum flux; (ii) the identification of the second [OIII] lambda 4959
line in the only object at high enough velocity that this line too falls into
the filter bandpass; (iii) emission line fluxes consistent with PNe at 100 Mpc
distance, in the range 2.8 x 10^{-19} - 1.7 x 10^{-18} erg/s/cm^2; and (iv) a
narrow velocity distribution approximately centered on the systemic velocity of
the Coma cluster. Comparing with the velocities of galaxies in our field, we
conclude that the great majority of these candidates would be intracluster PNe,
free floating in the Coma cluster core. Their velocity dispersion is ~760 km/s,
and their mean velocity is lower than that of the galaxies. The velocity
distribution suggests that the intracluster stellar population has different
dynamics from the galaxies in the Coma cluster core.
