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Measurement of the Relativistic Sunyaev–Zeldovich Correction in RX J1347.5-1145

Butler, Victoria L. and Feder, Richard M. and Daylan, Tansu and Mantz, Adam B. and Mercado, Dale and Montaña, Alfredo and Portillo, Stephen K. N. and Sayers, Jack and Vaughan, Benjamin J. and Zemcov, Michael and Zitrin, Adi (2022) Measurement of the Relativistic Sunyaev–Zeldovich Correction in RX J1347.5-1145. Astrophysical Journal, 932 (1). Art. No. 55. ISSN 0004-637X. doi:10.3847/1538-4357/ac6c04.

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We present a measurement of the relativistic corrections to the thermal Sunyaev–Zel’dovich (SZ) effect spectrum, the rSZ effect, toward the massive galaxy cluster RX J1347.5-1145 by combining submillimeter images from Herschel-SPIRE with millimeter wavelength Bolocam maps. Our analysis simultaneously models the SZ effect signal, the population of cosmic infrared background galaxies, and the galactic cirrus dust emission in a manner that fully accounts for their spatial and frequency-dependent correlations. Gravitational lensing of background galaxies by RX J1347.5-1145 is included in our methodology based on a mass model derived from the Hubble Space Telescope observations. Utilizing a set of realistic mock observations, we employ a forward modeling approach that accounts for the non-Gaussian covariances between the observed astrophysical components to determine the posterior distribution of SZ effect brightness values consistent with the observed data. We determine a maximum a posteriori (MAP) value of the average Comptonization parameter of the intracluster medium (ICM) within R₂₅₀₀ to be〈y〉₂₅₀₀ = 1.56 × 10−4, with corresponding 68% credible interval [1.42, 1.63] × 10⁻⁴, and a MAP ICM electron temperature of 〈T_(sz)〉2500 = 22.4 keV with 68% credible interval spanning [10.4, 33.0] keV. This is in good agreement with the pressure-weighted temperature obtained from Chandra X-ray observations, 〈T_(x,pw)〉₂₅₀₀ = 17.4 ± 2.3 keV. We aim to apply this methodology to comparable existing data for a sample of 39 galaxy clusters, with an estimated uncertainty on the ensemble mean 〈T_(sz)〉₂₅₀₀ at the ≃ 1 keV level, sufficiently precise to probe ICM physics and to inform X-ray temperature calibration.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Butler, Victoria L.0000-0002-0941-0407
Feder, Richard M.0000-0002-9330-8738
Daylan, Tansu0000-0002-6939-9211
Mantz, Adam B.0000-0002-8031-1217
Mercado, Dale0000-0002-7485-7563
Montaña, Alfredo0000-0003-4229-381X
Portillo, Stephen K. N.0000-0001-8132-8056
Sayers, Jack0000-0002-8213-3784
Vaughan, Benjamin J.0000-0002-9813-0270
Zemcov, Michael0000-0001-8253-1451
Zitrin, Adi0000-0002-0350-4488
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 October 25; revised 2022 April 5; accepted 2022 April 29; published 2022 June 15. The authors acknowledge Research Computing at the Rochester Institute of Technology for providing computational resources and support that have contributed to the research results reported in this publication. The authors would also like to acknowledge Glenn Morris ( for their assistance with Chandra data reduction. This work was supported by NASA ADAP research grant 80NSSC19K1018. A.Z. acknowledges support from the Ministry of Science and Technology, Israel. Facilities: Herschel - European Space Agency's Herschel space observatory, HST - , Chandra X-Ray Observatory - , Planck - , CSO - . Software: astropy (Astropy Collaboration et al. 2013, 2018), corner (Foreman-Mackey 2016), SZpack (Chluba et al. 2012, 2013), CIAO (; Fruscione et al. 2006; SPIE Proc. 6270, 62701V; D.R. Silvia & R.E. Doxsey, eds.), PCAT-DE (R. Feder et al. 2021, in preparation).
Funding AgencyGrant Number
Ministry of Science and Technology (Israel)UNSPECIFIED
Subject Keywords:Galaxy clusters; Sunyaev-Zeldovich effect; Radio astronomy; Intracluster medium
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Galaxy clusters (584); Sunyaev-Zeldovich effect (1654); Radio astronomy (1338); Intracluster medium (858)
Record Number:CaltechAUTHORS:20220722-769130000
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Official Citation:Victoria L. Butler et al 2022 ApJ 932 55
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115785
Deposited By: George Porter
Deposited On:26 Jul 2022 19:23
Last Modified:26 Jul 2022 19:23

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