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

R. Adam, M. Arnaud, I. Bartalucci, P. Ade, P. André, A. Beelen, A. Benoît, A. Bideaud, N. Billot, H. Bourdin, O. Bourrion, M. Calvo, A. Catalano, G. Coiffard, B. Comis, A. D'Addabbo, F. X. Désert, S. Doyle, C. Ferrari, J. GoupyC. Kramer, G. Lagache, S. Leclercq, J. F. Macías-Pérez, S. Maurogordato, Philip Mauskopf, F. Mayet, A. Monfardini, F. Pajot, E. Pascale, L. Perotto, G. Pisano, E. Pointecouteau, N. Ponthieu, G. W. Pratt, V. Revéret, A. Ritacco, L. Rodriguez, C. Romero, F. Ruppin, K. Schuster, A. Sievers, S. Triqueneaux, C. Tucker, R. Zylka

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


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.

Original languageEnglish (US)
Article numberA64
JournalAstronomy and Astrophysics
StatePublished - Oct 1 2017


  • Galaxies: clusters: individual: MACS J0717.5+3745
  • Galaxies: clusters: intracluster medium
  • Techniques: high angular resolution
  • X-rays: galaxies: clusters

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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