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

Abstract

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 sub-mm images from Herschel-SPIRE with mm-wave Bolocam maps. Our analysis simultaneously models the SZ effect signal, the population of cosmic infrared background (CIB) galaxies, and 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 HST observations. Utilizing a set of realistic mock observations, we employ a forward modelling approach that accounts for the non-Gaussian covariances between 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 intra-cluster medium (ICM) within R${}_{2500}$ to be $⟨y{⟩}_{2500}=1.56\times 10^{-4}$, with corresponding 68~per cent credible interval $[1.42,1.63]\times 10^{-4}$, and a MAP ICM electron temperature of $⟨{\text{T}}_{\text{sz}}{⟩}_{2500}=22.4$~keV with 68~per cent credible interval spanning $[10.4,33.0]$~keV. This is in good agreement with the pressure-weighted temperature obtained from {\it Chandra} X-ray observations, $⟨{\text{T}}_{\text{x,pw}}{⟩}_{2500}=17.4\pm 2.3$~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 $⟨{\text{T}}_{\text{sz}}{⟩}_{2500}$ at the $\simeq 1$~keV level, sufficiently precise to probe ICM physics and to inform X-ray temperature calibration.

arXiv comment20 pages, 9 figures

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