Perrott, Y. C.; Olamaie, M.; Rumsey, C.; Brown, M. L.; Feroz, F.; Grainge, K. J. B.; Hobson, M. P.; Lasenby, A. N.; MacTavish, C. J.; Pooley, G. G.; Saunders, R. D. E.; Schammel, M. P.; Scott, P. F.; Shimwell, T. W.; Titterington, D. J.; Waldram, E. M.; Aghanim, N.; Arnaud, M.; Ashdown, M.; Aussel, H.; Barrena, R.; Bikmaev, I.; Böhringer, H.; Burenin, R.; Carvalho, P.; Chon, G.; Comis, B.; Dahle, H.; Democles, J.; Douspis, M.; Harrison, D.; Hempel, A.; Hurier, G.; Khamitov, I.; Kneissl, R.; Macías-Pérez, J. F.; Melin, J.-B.; Pointecouteau, E.; Pratt, G. W.; Rubiño-Martín, J. A.; Stolyarov, V.; Sutton, D.
Bibliographical reference
Astronomy and Astrophysics, Volume 580, id.A95, 39 pp.
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8
2015
Journal
Citations
21
Refereed citations
21
Description
We present observations and analysis of a sample of 123 galaxy clusters
from the 2013 Planck catalogue of Sunyaev-Zel'dovich sources with the
Arcminute Microkelvin Imager (AMI), a ground-based radio interferometer.
AMI provides an independent measurement with higher angular resolution,
3 arcmin compared to the Planck beams of 5-10 arcmin. The AMI
observations thus provide validation of the cluster detections, improved
positional estimates, and a consistency check on the fitted size
(θs) and flux (Ytot) parameters in the
generalised Navarro, Frenk and White (GNFW) model. We detect 99 of the
clusters. We use the AMI positional estimates to check the positional
estimates and error-bars produced by the Planck algorithms PowellSnakes
and MMF3. We find that Ytot values as measured by AMI are
biased downwards with respect to the Planck constraints, especially for
high Planck-S/N clusters. We perform simulations to show that this can
be explained by deviation from the universal pressure profile shape used
to model the clusters. We show that AMI data can constrain the α
and β parameters describing the shape of the profile in the GNFW
model for individual clusters provided careful attention is paid to the
degeneracies between parameters, but one requires information on a wider
range of angular scales than are present in AMI data alone to correctly
constrain all parameters simultaneously.
Appendices are available in electronic form at http://www.aanda.org
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