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A Measurement of the Kinetic Sunyaev-Zel'dovich Signal Toward MACS J0717.5+3745

Sayers, J. and Mroczkowski, T. and Zemcov, M. and Korngut, P. M. and Bock, J. and Bulbul, E. and Czakon, N. G. and Egami, E. and Golwala, S. R. and Koch, P. M. and Lin, K.-Y. and Mantz, A. and Molnar, S. M. and Moustakas, L. and Pierpaoli, E. and Rawle, T. D. and Reese, E. D. and Rex, M. and Shitanishi, J. A. and Siegel, S. and Umetsu, K. (2013) A Measurement of the Kinetic Sunyaev-Zel'dovich Signal Toward MACS J0717.5+3745. Astrophysical Journal, 778 (1). Art. No. 52. ISSN 0004-637X.

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We report our analysis of MACS J0717.5+3745 using 140 and 268 GHz Bolocam data collected at the Caltech Submillimeter Observatory. We detect extended Sunyaev-Zel'dovich (SZ) effect signal at high significance in both Bolocam bands, and we employ Herschel-SPIRE observations to subtract the signal from dusty background galaxies in the 268 GHz data. We constrain the two-band SZ surface brightness toward two of the sub-clusters of MACS J0717.5+3745: the main sub-cluster (named C), and a sub-cluster identified in spectroscopic optical data to have a line-of-sight velocity of +3200 km s^(–1) (named B). We determine the surface brightness in two separate ways: via fits of parametric models and via direct integration of the images. For both sub-clusters, we find consistent surface brightnesses from both analysis methods. We constrain spectral templates consisting of relativistically corrected thermal and kinetic SZ signals, using a jointly-derived electron temperature from Chandra and XMM-Newton under the assumption that each sub-cluster is isothermal. The data show no evidence for a kinetic SZ signal toward sub-cluster C, but they do indicate a significant kinetic SZ signal toward sub-cluster B. The model-derived surface brightnesses for sub-cluster B yield a best-fit, line-of-sight velocity of v_z = +3450 ± 900 km s^(–1), with (1 – Prob[v_z ≥ 0]) = 1.3 × 10^(–5) (4.2σ away from 0 for a Gaussian distribution). The directly integrated sub-cluster B SZ surface brightnesses provide a best-fit v_z = +2550 ± 1050 km s^(–1), with (1 – Prob[vz ≥ 0]) = 2.2 × 10^(–3) (2.9σ).

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Golwala, S. R.0000-0002-1098-7174
Additional Information:© 2013 The American Astronomical Society. Received 2013 July 12; accepted 2013 September 25; published 2013 November 1. We acknowledge the assistance of: the day crew and Hilo staff of the Caltech Submillimeter Observatory, who provided invaluable assistance during data-taking for this data set; Kathy Deniston, Barbara Wertz, and Diana Bisel, who provided effective administrative support at Caltech and in Hilo; the Bolocam observations were partially supported by the Gordon and Betty Moore Foundation. J.S. was supported by NSF/AST-0838261, NASA/NNX11AB07G, and the Norris Foundation CCAT Postdoctoral Fellowship; support for T.M. was provided by NASA through Einstein Fellowship Program grant No. PF0-110077 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060; P.M.K. was supported by a NASA Postdoctoral Program Fellowship; N.C. was partially supported by a NASA Graduate Student Research Fellowship; A.M. was partially supported by NSF/AST-0838187 and NSF/AST-1140019; E.P. and J.A.S. were partially supported by NASA/ NNX07AH59G; S.S. was supported by NASA Earth and Space Science Fellowship NASA/NNX12AL62H; K.U. acknowledges partial support from the National Science Council of Taiwan grant NSC100-2112-M-001-008-MY3 and from the Academia Sinica Career Development Award. A portion of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. This research made use of the Caltech Submillimeter Observatory, which was operated at the time by the California Institute of Technology under cooperative agreement with the National Science Foundation (NSF/AST-0838261). This work is also based in part on observations made with Herschel, a European Space Agency Cornerstone Mission with a significant participation by NASA. Partial support for this work was provided by NASA through an award issued by JPL/Caltech. Facilities: CSO, CXO, Herschel, XMM
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Kenneth T. and Eileen L. Norris FoundationUNSPECIFIED
NASA Einstein Fellowship ProgramPF0-110077
NASA Postdoctoral ProgramUNSPECIFIED
NASA Graduate Student Research FellowshipUNSPECIFIED
NASA Earth and Space Science FellowshipNNX12AL62H
National Science Council (Taipei)NSC100-2112-M-001-008-MY3
Academia SinicaUNSPECIFIED
Subject Keywords:galaxies: clusters: individual (MACS J0717.5+3745) – galaxies: clusters: intracluster medium
Record Number:CaltechAUTHORS:20131212-125628354
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Official Citation:A Measurement of the Kinetic Sunyaev-Zel'dovich Signal Toward MACS J0717.5+3745 J. Sayers et al. 2013 ApJ 778 52
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42990
Deposited By: Tony Diaz
Deposited On:12 Dec 2013 21:22
Last Modified:12 Dec 2016 00:58

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