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- Title
IV. Mass-temperature relation of the bright cluster sample.
- Authors
Lieu, M.; Smith, G. P.; Giles, P. A.; Ziparo, F.; Maughan, B. J.; Démoclès, J.; Pacaud, F.; Pierre, M.; Adami, C.; Bahé, Y. M.; Clerc, N.; Chiappetti, L.; Eckert, D.; Ettori, S.; Lavoie, S.; Le Fevre, J. P.; McCarthy, I. G.; Kilbinger, M.; Ponman, T. J.; Sadibekova, T.
- Abstract
Context: The XXL Survey is the largest survey carried out by XMM-Newton. Covering an area of 50 deg², the survey contains ~450 galaxy clusters out to a redshift ~2 and to an X-ray flux limit of ~5 × 10-15 erg s-1 cm-2. This paper is part of the first release of XXL results focussed on the bright cluster sample. Aims: We investigate the scaling relation between weak-lensing mass and X-ray temperature for the brightest clusters in XXL. The scaling relation discussed in this article is used to estimate the mass of all 100 clusters in XXL-100-GC. Methods: Based on a subsample of 38 objects that lie within the intersection of the northern XXL field and the publicly available CFHTLenS shear catalog, we derive the weak-lensing mass of each system with careful considerations of the systematics. The clusters lie at 0.1 < z < 0.6 and span a temperature range of T ⋍ 1-5 keV. We combine our sample with an additional 58 clusters from the literature, increasing the range to T ⋍ 1-10 keV. To date, this is the largest sample of clusters with weak-lensing mass measurements that has been used to study the mass-temperature relation. Results: The mass-temperature relation fit (M ∝ Tb) to the XXL clusters returns a slope b = 1.78+0.37-0.32 and intrinsic scatter σlnM|T ⋍ 0.53; the scatter is dominated by disturbed clusters. The fit to the combined sample of 96 clusters is in tension with selfsimilarity, b = 1.67 ± 0.12 and σlnM|T ⋍ 0.41. Conclusions: Overall our results demonstrate the feasibility of ground-based weak-lensing scaling relation studies down to cool systems of ~1 keV temperature and highlight that the current data and samples are a limit to our statistical precision. As such we are unable to determine whether the validity of hydrostatic equilibrium is a function of halo mass. An enlarged sample of cool systems, deeper weak-lensing data, and robust modelling of the selection function will help to explore these issues further.
- Subjects
GALAXY clusters; GRAVITATIONAL lenses; GRAVITATIONAL effects; HYDROSTATIC equilibrium; GALACTIC halos
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2016, Vol 592, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201526883