XMM-Newton observations of the Perseus Cluster. I. The temperature and surface brightness structure

摘要: We present preliminary results of a XMM-Newton 50 ks observation the Perseus Cluster that provides an unprecedented view central 0.5 Mpc region. The projected gas temperature declines smoothly by factor 2 from maximum value ~ 7 keV in outer regions to just above 3 at cluster center. Over this same range, heavy-element abundance rises slowly 0.4 solar as radius decreases 14' 5', and then it peak almost 0.7 125 before declining global east-west asymmetry surface brightness distributions, approximately aligned with chain bright galaxies, suggests ongoing merger, although modest degree observed certainly excludes major merger interpretation. galaxies probably traces filament along which accretion started some time ago is continuing time. A cold dense (low-entropy) core like well "protected" against penetration infalling groups poor clusters, whereas noncooling clusters such Coma A1367, subclusters can penetrate deeply into In Perseus, associated may be stripped completely outskirts main only compression waves (shocks) reach regions. argue, show supporting simulations, passage wave(s) qualitatively explain overall horseshoe shaped appearance map (the hot surrounds colder, low-entropy core) other features core. These simulations also traverse core, they induce oscillatory motion generate multiple sharp "edges" on opposite sides galaxy. Gas motions induced mergers natural way high frequency seen cooling cores.