SUZAKU OBSERVATIONS OF THE PROTOTYPE WIND-BLOWN BUBBLE NGC 6888

摘要: We present an analysis of the Suzaku observations prototype wind-blown bubble NGC 6888 which is based both on use standard spectral models and a direct comparison theoretical with observations. The X-ray spectra are soft most X-rays in 0.3-1.5 keV energy range. But, hard (1.5-4.0 keV) also detected (~10% observed flux). corresponding fits require relatively cool plasma kT ≤ 0.5 keV, but much hotter temperature ≥ 2.0 needed to match emission. find no appreciable variations within hot 6888. derived abundances (N, O, Ne) consistent those optical nebula. This indicates common origin emitting gas outer cold shell: (having non-uniform spatial distribution: clumps) has flown into from If electron thermal conduction efficient, this can naturally explain low plasma. Alternatively, will be adiabatic clumps heated up temperatures likely by exchange between heavy particles (hot ions diffusing clumps).