Sunyaev-Zel'dovich observation of the Bullet-like cluster Abell 2146 with the Arcminute Microkelvin Imager
Carmen Rodriguez-Gonzalvez, Malak Olamaie, Matthew L. Davies, Andy C., Fabian, Farhan Feroz, Thomas M. O. Franzen, Keith J. B. Grainge, Michael P., Hobson, Natasha Hurley-Walker, Anthony N. Lasenby, Guy G. Pooley, Helen R., Russell, Jeremy S. Sanders, Richard D. E. Saunders

TL;DR
This study uses AMI observations to detect and analyze the Sunyaev-Zel'dovich effect in the merging galaxy cluster Abell 2146, revealing gas distribution irregularities and estimating cluster parameters.
Contribution
First application of AMI SZ observations to Abell 2146, combining Bayesian analysis with a simplified cluster model to estimate mass and temperature in a merging system.
Findings
Detected SZ effect with 13 sigma significance.
Discovered extended, perpendicular gas regions indicating merger activity.
Estimated cluster mass as 4.1 ± 0.5 x 10^{14} h^{-1} M_sun and temperature as 4.5 ± 0.5 keV.
Abstract
We present 13.9-18.2 GHz observations of the Sunyaev-Zel'dovich (SZ) effect towards Abell 2146 using the Arcminute Microkelvin Imager (AMI). The cluster is detected with a peak SNR ratio of 13 sigma in the radio source subtracted map. Comparison of the SZ and X-ray images suggests that they both have extended regions which lie approximately perpendicular to one another, with their emission peaks significantly displaced. These features indicate non-uniformities in the distributions of the gas temperature and pressure, indicative of a cluster merger. We use a Bayesian cluster analysis to explore the high-dimensional parameter space of the cluster-plus-sources model to obtain cluster parameter estimates in the presence of radio point sources, receiver noise and primordial CMB anisotropy; the probability of SZ + CMB primordial structure + radio sources + receiver noise to CMB + radio…
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