Herschel-ATLAS: Planck sources in the Phase 1 fields
  We present the results of a cross-correlation of the Planck Early Release
Compact Source Catalog (ERCSC) with the catalog of Herschel-ATLAS sources
detected in the Phase 1 fields, covering 134.55 deg2. There are 28 ERCSC
sources detected by Planck at 857 GHz in this area. As many as 16 of them are
probably high Galactic latitude cirrus; 10 additional sources can be clearly
identified as bright, low-z galaxies; one further source is resolved by
Herschel as two relatively bright sources; and the last is resolved into an
unusual condensation of low-flux, probably high-redshift point sources, around
a strongly lensed Herschel-ATLAS source at z = 3.26. Our results demonstrate
that the higher sensitivity and higher angular resolution H-ATLAS maps provide
essential information for the interpretation of candidate sources extracted
from Planck sub-mm maps.
