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 cluster 、 Astrophysics 、 ROSAT 、 Markov chain Monte Carlo 、 Galaxy group 、 Surface brightness 、 Physics 、 Active galactic nucleus 、 Monte Carlo method 、 Cooling flow 、 Astronomy
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.