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COS-B observations of long term variability and absorption phenomena in the X-ray emission from Cen X-3.

Bignami, G. F.; Molteni, D.; Hermsen, W. +12 more

Summary: The CO S-B satellite has observed the X-ray source Cen X-3 in the energy range 2 to 12 keV between 1975 Decenber 24 and 1976 January 23. Preliminary results based on about 10% of the data from the X-ray detector indicate that the source increased in emission during this period reaching a broad maximum around January 8. The three entrances…

COS-B observation of high-energy gamma radiation from the Vela region.

Bignami, G. F.; Hermsen, W.; Boella, G. +11 more

Summary. Preliminary results from the ESA gamma-ray astronomy satellite COS-B are presented for the region of the Vela supernova remnant. From an analysis of about 20 % of the collected data an enhancement of the radiation above about 100 MeV is observed in a 30x30 bin containing PSR. The enhancement is still present for gamma-ray energies above a…