The Planck satellite has recently completed an all-sky galaxy cluster survey exploiting the thermal Sunyaev-Zel'dovich (SZ) effect to locate some of the most massive systems observable. With a median redshift of ⟨z⟩=0.22, the clusters found by Planck at z>0.3 are proving to be exceptionally massive and/or disturbed systems. One notable Planck discovery at z=0.645, PLCK G147.3-16.6, has a dual core and hosts a radio halo, indicating it is likely in the process of merging. We present a 16."5 resolution SZ observation of this high-z merger using the Goddard-IRAM Superconducting 2 Millimeter Observer (GISMO), and compare it to X-ray follow-up observations with XMM-Newton. We find the SZ pressure substructure is offset from the core components seen in X-ray. We interpret this offset as possible line of sight temperature or density substructure due to the on-going merger.
@article{arxiv.1501.05051,
title = {Resolving the Merging Planck Cluster PLCK G147.3-16.6 with GISMO},
author = {T. Mroczkowski and A. Kovács and E. Bulbul and J. Staguhn and D. J. Benford and T. E. Clarke and R. J. van Weeren and H. T. Intema and S. Randall},
journal= {arXiv preprint arXiv:1501.05051},
year = {2015}
}
Comments
6 pages, 4 figures, 1 table. Accept for publication in ApJ Letters (9 June 2015)