Planck 2015 results. XXVII. The Second Planck Catalogue of Sunyaev-Zeldovich Sources
Planck Collaboration: P. A. R. Ade, N. Aghanim, M. Arnaud, M. Ashdown,, J. Aumont, C. Baccigalupi, A. J. Banday, R. B. Barreiro, R. Barrena, J. G., Bartlett, N. Bartolo, E. Battaner, R. Battye, K. Benabed, A. Beno\^it, A., Benoit-L\'evy, J.-P. Bernard, M. Bersanelli

TL;DR
The paper presents the largest all-sky Sunyaev-Zeldovich (SZ) galaxy cluster catalog from Planck data, including detailed analysis of its completeness, reliability, and multi-wavelength counterpart identification, revealing new low-redshift X-ray under-luminous clusters.
Contribution
It introduces the second Planck SZ catalog (PSZ2) with over 1600 detections, detailed survey analysis, and multi-wavelength counterpart identification, expanding the known galaxy cluster sample.
Findings
Contains 1653 SZ detections, 1203 confirmed clusters.
Achieves at least 83% purity in the catalog.
Identifies low-redshift X-ray under-luminous clusters.
Abstract
We present the all-sky Planck catalogue of Sunyaev-Zeldovich (SZ) sources detected from the 29 month full-mission data. The catalogue (PSZ2) is the largest SZ-selected sample of galaxy clusters yet produced and the deepest all-sky catalogue of galaxy clusters. It contains 1653 detections, of which 1203 are confirmed clusters with identified counterparts in external data-sets, and is the first SZ-selected cluster survey containing > confirmed clusters. We present a detailed analysis of the survey selection function in terms of its completeness and statistical reliability, placing a lower limit of 83% on the purity. Using simulations, we find that the Y5R500 estimates are robust to pressure-profile variation and beam systematics, but accurate conversion to Y500 requires. the use of prior information on the cluster extent. We describe the multi-wavelength search for counterparts in…
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