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AMI SZ observations and Bayesian analysis of a sample of six redshift-one clusters of galaxies

Schammel, Michel P. and Feroz, Farhan and Grainge, Keith J. B. and Hobson, Michael P. and Hurley-Walker, Natasha and Lasenby, Anthony N. and Olamaie, Malak and Perrott, Yvette C. and Pooley, Guy G. and Rodríguez-Gonzálvez, Carmen and Rumsey, Clare and Saunders, Richard D. E. and Scott, Paul F. and Shimwell, Timothy W. and Titterington, David J. and Waldram, Elizabeth M. (2013) AMI SZ observations and Bayesian analysis of a sample of six redshift-one clusters of galaxies. Monthly Notices of the Royal Astronomical Society, 431 (1). pp. 900-911. ISSN 0035-8711. doi:10.1093/mnras/stt212.

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We present 16-GHz Sunyaev–Zel’dovich observations using the Arcminute Microkelvin Imager (AMI) and subsequent Bayesian analysis of six galaxy clusters at redshift z ≈ 1 chosen from an X-ray- and infrared-selected sample from Culverhouse et al. In the subsequent analysis, we use two cluster models, an isothermal β-model and a Dark Matter Generalised Navarro-Frenk-White (DM-GNFW) model in order to derive a formal detection probability and the cluster parameters. We detect two clusters (CL J1415+3612 and XMJ 0830+5241) and measure their total masses out to a radius of 200 times the critical density at the respective cluster's redshift. For CL J1415+3612, we find M_(T, 200) = 7.3^(+1.8)_(−1.8) × 10^(14) M_⊙ (β-model) and M_(T, 200) = 10.4^(2.5)_(−2.4) × 10^(14) M_⊙ (DM-GNFW model) and for XMJ0830+5241, we find M_(T, 200) = 3.6^(+1.1)_(−1.1) × 10^(14) M_⊙, (β-model) and M_(T, 200) = 4.7^(+1.4)_(−1.4) × 10^(14) M_⊙ (DM-GNFW model), which agree with each other for each cluster. We also present maps before and after source subtraction of the entire sample and provide 1D and 2D posterior marginalized probability distributions for each fitted cluster profile parameter of the detected clusters. Using simulations which take into account the measured source environment from the AMI Large Array (LA), source confusion noise, cosmic microwave background primordials, instrument noise, we estimate from small-radius (r_(2500)) X-ray data from Culverhouse et al., the detectability of each cluster in the sample and compare it with the result from the Small Array (SA) data. Furthermore, we discuss the validity of the assumptions of isothermality and constant gas mass fraction. We comment on the bias that these small-radius estimates introduce to large-radius SZ predictions. In addition, we follow-up the two detections with deep, single-pointed LA observations. We find a 3σ tentative decrement towards CL J1415+3612 at high resolution and a 5σ high-resolution decrement towards XM J0830+5241.

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Hurley-Walker, Natasha0000-0002-5119-4808
Additional Information:© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 February 4. Received 2013 January 23; in original form 2012 October 29. First published online: March 5, 2013. We thank the anonymous referee for providing us with very constructive comments and suggestions. We also thank the staff of the Mullard Radio Astronomy Observatory for their invaluable assistance in the commissioning and operation of AMI, which is supported by Cambridge University and the STFC. MPS and CR gratefully acknowledge the support of STFC studentships and YCP gratefully acknowledges the support of a CCT/Cavendish Laboratory studentship. The analysis work was conducted on the Darwin Supercomputer of the University of Cambridge High Performance Computing Service supported by HEFCE and the Altix 3700 supercomputer at DAMTP, University of Cambridge supported by HEFCE and STFC. We are grateful to Stuart Rankin and Andrey Kaliazin for their computing assistance. This research has made use of the SIMBAD data base, operated at CDS, Strasbourg.
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Cambridge UniversityUNSPECIFIED
CCT/Cavendish Laboratory studentshipUNSPECIFIED
Subject Keywords: galaxies: clusters: individual: CLJ1415+3612 galaxies: clusters: individual: ISCS1438+34 galaxies: clusters: individual: RXJ0910+5422 galaxies: clusters: individual: SPJ1638+4039 galaxies: clusters: individual: XMJ0830+5241 galaxies: clusters: individual: XMJ0849+4452
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Official Citation: AMI Consortium: Michel P. Schammel, Farhan Feroz, Keith J. B. Grainge, Michael P. Hobson, Natasha Hurley-Walker, Anthony N. Lasenby, Malak Olamaie, Yvette C. Perrott, Guy G. Pooley, Carmen Rodríguez-Gonzálvez, Clare Rumsey, Richard D. E. Saunders, Paul F. Scott, Timothy W. Shimwell, David J. Titterington, and Elizabeth M. Waldram AMI SZ observations and Bayesian analysis of a sample of six redshift-one clusters of galaxies MNRAS (May 1, 2013) Vol. 431 900-911 doi:10.1093/mnras/stt212
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38947
Deposited On:18 Jun 2013 15:43
Last Modified:09 Nov 2021 23:41

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