Bayesian modelling of clusters of galaxies from multi-frequency pointed Sunyaev--Zel'dovich observations Export

@article{citeulike:3500651, abstract = {We present a Bayesian approach to modelling galaxy clusters using multi-frequency pointed observations from telescopes that exploit the Sunyaev--Zel'dovich effect. We use the recently developed MultiNest technique (Feroz, Hobson \& Bridges, 2008) to explore the high-dimensional parameter spaces and also to calculate the Bayesian evidence. This permits robust parameter estimation as well as model comparison. Tests on simulated Arcminute Microkelvin Imager observations of a cluster, in the presence of primary CMB signal, radio point sources (detected as well as an unresolved background) and receiver noise, show that our algorithm is able to analyse jointly the data from six frequency channels, sample the posterior space of the model and calculate the Bayesian evidence very efficiently on a single processor. We also illustrate the robustness of our detection process by applying it to a field with radio sources and primordial CMB but no cluster, and show that indeed no cluster is identified. The extension of our methodology to the detection and modelling of multiple clusters in multi-frequency SZ survey data will be described in a future work.}, archivePrefix = {arXiv}, author = {Feroz, F. and Hobson, M. P. and Zwart, J. T. L. and Saunders, R. D. E. and Grainge, K. J. B.}, citeulike-article-id = {3500651}, citeulike-linkout-0 = {http://arxiv.org/abs/0811.1199}, citeulike-linkout-1 = {http://arxiv.org/pdf/0811.1199}, day = {7}, eprint = {0811.1199}, keywords = {bayesian, evidence}, month = {Nov}, posted-at = {2008-11-15 22:44:46}, priority = {2}, title = {Bayesian modelling of clusters of galaxies from multi-frequency pointed Sunyaev\&\#45;\&\#45;Zel'dovich observations}, url = {http://arxiv.org/abs/0811.1199}, year = {2008} }

TY - JOUR ID - citeulike:3500651 L3 - citeulike-article-id:3500651 N2 - We present a Bayesian approach to modelling galaxy clusters using multi-frequency pointed observations from telescopes that exploit the Sunyaev--Zel'dovich effect. We use the recently developed MultiNest technique (Feroz, Hobson & Bridges, 2008) to explore the high-dimensional parameter spaces and also to calculate the Bayesian evidence. This permits robust parameter estimation as well as model comparison. Tests on simulated Arcminute Microkelvin Imager observations of a cluster, in the presence of primary CMB signal, radio point sources (detected as well as an unresolved background) and receiver noise, show that our algorithm is able to analyse jointly the data from six frequency channels, sample the posterior space of the model and calculate the Bayesian evidence very efficiently on a single processor. We also illustrate the robustness of our detection process by applying it to a field with radio sources and primordial CMB but no cluster, and show that indeed no cluster is identified. The extension of our methodology to the detection and modelling of multiple clusters in multi-frequency SZ survey data will be described in a future work. TI - Bayesian modelling of clusters of galaxies from multi-frequency pointed Sunyaev--Zel'dovich observations KW - bayesian KW - evidence AU - Feroz, F AU - Hobson, MP AU - Zwart, JTL AU - Saunders, RDE AU - Grainge, KJB PY - 2008/Nov/07/ UR - http://arxiv.org/abs/0811.1199 ER -