CARMA follow-up of the northern unconfirmed PLANCK galaxy cluster candidates

Abstract

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%.

Accepted for publication in the Astrophysical Journal. 9 pages, 4 figures, 4 tables. arXiv admin note: text overlap with arXiv:astro-ph/0610115

References in corpus (2)

• X-ray and Sunyaev-Zel'dovich Effect Measurements of the Gas Mass Fraction in Galaxy Clusters
• South Pole Telescope Detections of the Previously Unconfirmed Planck Early SZ Clusters in the Southern Hemisphere

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