Sunyaev–Zel’dovich profile fitting with joint AMI-Planck analysis
| Autor: | Anthony Lasenby, M. Olamaie, Richard D. E. Saunders, Patrick J. Elwood, Kamran Javid, P. Carvalho, Y. C. Perrott, Michael P. Hobson |
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| Přispěvatelé: | Perrott, Yvette Chanel [0000-0002-6255-8240], Javid, Kamran [0000-0002-2089-3964], Lasenby, Anthony [0000-0002-8208-6332], Apollo - University of Cambridge Repository |
| Rok vydání: | 2019 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
galaxies: clusters: intracluster medium Arcminute Microkelvin Imager FOS: Physical sciences galaxies: clusters: individual: PSZ2 G063.80+11.42 01 natural sciences symbols.namesake Angular diameter 0103 physical sciences Cluster (physics) Statistical physics Planck 010303 astronomy & astrophysics Galaxy cluster Physics 010308 nuclear & particles physics Astronomy and Astrophysics Function (mathematics) methods: data analysis Interferometry galaxies: clusters: general Space and Planetary Science cosmology: observations symbols Degeneracy (mathematics) Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 486:2116-2128 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | We develop a Bayesian method of analysing Sunyaev-Zel'dovich measurements of galaxy clusters obtained from the Arcminute Microkelvin Imager (AMI) radio interferometer system and from the Planck satellite, using a joint likelihood function for the data from both instruments. Our method is applicable to any combination of Planck data with interferometric data from one or more arrays. We apply the analysis to simulated clusters and find that when the cluster pressure profile is known a-priori, the joint dataset provides precise and accurate constraints on the cluster parameters, removing the need for external information to reduce the parameter degeneracy. When the pressure profile deviates from that assumed for the fit, the constraints become biased. Allowing the pressure profile shape parameters to vary in the analysis allows an unbiased recovery of the integrated cluster signal and produces constraints on some shape parameters, depending on the angular size of the cluster. When applied to real data from Planck-detected cluster PSZ2 G063.80+11.42, our method resolves the discrepancy between the AMI and Planck $Y$-estimates and usefully constrains the gas pressure profile shape parameters at intermediate and large radii. 13 pages, 10 figures. Submitted to MNRAS. Post-referee version |
| Databáze: | OpenAIRE |
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