0000000000073148
AUTHOR
B. G. Taylor
New high energy γ-ray sources observed by COS B
LOCALISED γ-ray sources contribute to the overall galactic emission; some of these sources have been identified with known astronomical objects1,2, while several unidentified γ-ray sources have also been reported3,4. We describe here a search for γ-ray sources using data from the ESA γ-ray satellite COS B which revealed 10 new unidentified sources. These sources seem to be galactic with typical γ-ray luminosities above 100 MeV in excess of 1035 erg s−1.
The Gas Scintillation Proportional Counter on EXOSAT
The inclusion of a gas scintillation proportional counter (GSPC) within the EXOSAT payload complement significantly improves the spectroscopic capability of the mission. This broad-band medium energy spectrometer used in conjunction with the large area proportioni counter array (ME) should provide additional spectroscopic details on strong X-ray sources at photon energies above ~ 2 keV. The novel type of detector has an energy resolution at least a factor of two better than the ME experiment over a similar bandwidth (2 – 40 keV).
COS-B Observations of Long Term Variability and Absorption Phenomena in the X-ray Emission from Cen X-3
The COS-B satellite has observed the X-ray source Cen X-3 in the energy range 2 to 12 keV