CARMA follow-up of the northern unconfirmed PLANCK galaxy cluster
  candidates
  We present CARMA observations of the three northern unconfirmed galaxy
clusters discovered by the PLANCK satellite. We confirm the existence of two
massive clusters (PLCKESZ G115.71+17.52 and PLCKESZ G121.11+57.01) at high
significance. For these clusters, we present refined centroid locations from
the 31 GHz CARMA data, as well as mass estimates obtained from a joint analysis
of CARMA and PLANCK data. We do not detect the third candidate, PLCKESZ
G189.84-37.24, and place an upper limit on its mass of M500 < 3.2 X 10^(14)
M_SUN at 68% confidence. Considering our data and the characteristics of the
PLANCK Early Release SZ Catalog, we conclude that this object is likely to be a
cold-core object in the plane of our Galaxy. As a result, we estimate the
purity of the ESZ Catalog to be greater than 99.5%.
