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

Adam, R., Arnaud, M., Bartalucci, I., Ade, Peter ORCID:, Doyle, Simon ORCID:, Mauskopf, Philip ORCID:, Pascale, Enzo ORCID:, Pisano, Giampaolo ORCID: and Tucker, Carole ORCID: 2017. Mapping the hot gas temperature in galaxy clusters using X-ray and Sunyaev-Zel'dovich imaging. Astronomy and Astrophysics 606 , A64. 10.1051/0004-6361/201629810

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 26 October 2017
Date of Acceptance: 5 July 2017
Last Modified: 10 May 2023 18:44

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