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: https://orcid.org/0000-0002-5127-0401, Doyle, Simon ORCID: https://orcid.org/0000-0002-9054-986X, Mauskopf, Philip ORCID: https://orcid.org/0000-0001-6397-5516, Pascale, Enzo ORCID: https://orcid.org/0000-0002-3242-8154, Pisano, Giampaolo ORCID: https://orcid.org/0000-0003-4302-5681 and Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918 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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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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	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:	24 Oct 2025 21:19
URI:	https://orca.cardiff.ac.uk/id/eprint/105985

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