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Mapping the hot gas temperature in galaxy clusters using X-ray and Sunyaev-Zel’dovich imaging

Abstract : We propose a method to map the temperature distribution of the hot gas in galaxy clusters that uses resolved images of the thermal Sunyaev-Zel’dovich (tSZ) effect in combination with X-ray data. Application to images from the New IRAM KIDs Array (NIKA) and XMM-Newton allows us to measure and determine the spatial distribution of the gas temperature in the merging cluster MACS J0717.5+3745, at z = 0.55. Despite the complexity of the target object, we find a good morphological agreement between the temperature maps derived from X-ray spectroscopy only – using XMM-Newton (TXMM) and Chandra (TCXO) – and the new gas-mass-weighted tSZ+X-ray imaging method (TSZX). We correlate the temperatures from tSZ+X-ray imaging and those from X-ray spectroscopy alone and find that TSZX is higher than TXMM and lower than TCXO by ~ 10% in both cases. Our results are limited by uncertainties in the geometry of the cluster gas, contamination from kinetic SZ (~10%), and the absolute calibration of the tSZ map (7%). Investigation using a larger sample of clusters would help minimise these effects.Key words: techniques: high angular resolution / galaxies: clusters: individual: MACS J0717.5+3745 / X-rays: galaxies: clusters / galaxies: clusters: intracluster medium
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https://hal.archives-ouvertes.fr/hal-01645595
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Submitted on : Tuesday, January 19, 2021 - 2:21:13 PM
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R. Adam, M. Arnaud, I. Bartalucci, P. Ade, P. André, et al.. Mapping the hot gas temperature in galaxy clusters using X-ray and Sunyaev-Zel’dovich imaging. Astron.Astrophys., 2017, 606, pp.A64. ⟨10.1051/0004-6361/201629810⟩. ⟨hal-01645595⟩

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