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The Compact Central Object in Cassiopeia A: A Neutron Star with Hot Polar Caps or a Black Hole?
The central pointlike X-ray source of the Cassiopeia A supernova remnant was discovered in the Chandra first light observation and found later in the archival ROSAT and Einstein images. The analysis of these data does not show statistically significant variability of the source. Because of the small number of photons …