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abstract |
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Dark Cluster is a kind of objects which has few galaxies in it. Shortage of Galaxies sould lead to very low metal abundance in IGM plasma. Discovery of distant dark cluster AXJ2019+1127 with ASCA, however, arises a big mystery because it has extremely high metal abundance. Is there any object like this? A nearby diffuse X-ray object RXJ1833.6+6520 seems to have seldom galaxies in it. So we propose this object as a candidate for nearby dark cluster to be observed with ASCA. ASCA will be able to detect its metal abundance and other propoty, and will show us the nature of this object. |
{\it ROSAT} observations have shown that nearby radio galaxies with prominent cores and jets contain multiple spectral and spatial components. Even the unresolved component's spectrum is more complicated than simple power law or thermal emission, but the limited spectral capabilities of the PSPC do not allow an unambiguousspectral decomposition. Here we propose ASCA observations of the two brightest radio galaxies, for which we have extensive {\it ROSAT} datasets and which show strong spectral and spatial structures. The ASCA spectra will characterize the emission mechanisms without ambiguity, and the imaging capability will place constraints on the extended components, which are believed to arise from hot gas in the associated groups. |
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