The Herschel Virgo Cluster Survey. XV. Planck submillimetre sources in
  the Virgo Cluster
  We cross-correlate the Planck Catalogue of Compact Sources (PCCS) with the
fully sampled 84 deg2 Herschel Virgo Cluster Survey (HeViCS) fields. We search
for and identify the 857 and 545 GHz PCCS sources in the HeViCS fields by
studying their FIR/submm and optical counterparts. We find 84 and 48 compact
Planck sources in the HeViCS fields at 857 and 545 GHz, respectively. Almost
all sources correspond to individual bright Virgo Cluster galaxies. The vast
majority of the Planck detected galaxies are late-type spirals, with the Sc
class dominating the numbers, while early-type galaxies are virtually absent
from the sample, especially at 545 GHz. We compare the HeViCS SPIRE flux
densities for the detected galaxies with the four different PCCS flux density
estimators and find an excellent correlation with the aperture photometry flux
densities, even at the highest flux density levels. We find only seven PCCS
sources in the HeViCS fields without a nearby galaxy as obvious counterpart,
and conclude that all of these are dominated by Galactic cirrus features or are
spurious detections. No Planck sources in the HeViCS fields seem to be
associated to high-redshift proto-clusters of dusty galaxies or strongly lensed
submm sources. Finally, our study is the first empirical confirmation of the
simulation-based estimated completeness of the PCCS, and provides a strong
support of the internal PCCS validation procedure.
