Bayesian modelling of the cool core galaxy group NGC 4325

作者: Alastair J. R. Sanderson , Paul A. Russell , Trevor J. Ponman

DOI: 10.1111/J.1365-2966.2007.11660.X

关键词: Galaxy clusterAstrophysicsROSATMarkov chain Monte CarloGalaxy groupSurface brightnessPhysicsActive galactic nucleusMonte Carlo methodCooling flowAstronomy

摘要: We present an X-ray analysis of the radio-quiet cool-core galaxy group NGC 4325 (z = 0.026) based on Chandra and ROSAT observations. The data were analysed using XSPEC deprojection, 2D spectral mapping forward-fitting with parametric models. Additionally, a Markov Chain Monte Carlo method was used to perform joint Bayesian data. results various methods are compared, particularly those obtained by deprojection. reveals presence cool gas displaced up 10 kpc from centre. surface brightness shows core be highly disturbed, indicates two small cavities within 15 core. deprojection that has steep entropy profile, suggesting active galactic nucleus (AGN) outburst may about occur. With evidence prior AGN activity, but no radio emission currently observed, we suggest in pre-outburst state, providing previous, weak outburst.

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