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

Victoria L. Butler, Richard M. Feder, Tansu Daylan, Adam B. Mantz, Dale Mercado, Alfredo Montaña, Stephen K.N. Portillo, Jack Sayers, Benjamin J. Vaughan, Michael Zemcov, Adi Zitrin

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1 Scopus citations


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 R 2500 to be ã-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 sz2500 = 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, ã-T x,pw2500 = 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 ã-T sz2500 at the - 1 keV level, sufficiently precise to probe ICM physics and to inform X-ray temperature calibration.

Original languageEnglish
Article number55
JournalAstrophysical Journal
Issue number1
StatePublished - 1 Jun 2022

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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