Physics
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997sccha..40...93s&link_type=abstract
Science in China, Series A, Vol. 40, No. 1, p. 93 - 104
Physics
Soft X Rays: Spiral Galaxies, Soft X Rays: Nearby Galaxies
Scientific paper
The pointed observations of NGC 3077 are analyzed by position sensitive proportional counter (PSPC) on board the ROSAT satellite on 1991-04-18, finding out that the X-ray emission range of M81 has, in the softer and more sensitive ROSAT PSPC band (0.2 - 2.4 keV), extended by 40% larger than ever observed by image proportional counter (IPC) on board the Einstein satellite, which shows that M81 has a larger X-ray corona. It is concluded that M81 nucleus has no variabilities on time scale of a few minutes; hence the possibility of M81 nucleus having the marginal variability over time scale of about 2 min that Fabbiano (1988) found from the Einstein IPC observations is ruled out.
Bi Hongguang
Li Qibin
Su Yang
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