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New high energy gamma-ray sources observed by COS B
Bignami, G. F.; Hermsen, W.; Masnou, J. L. +7 more
Results are reported for a search for gamma-ray sources based on data obtained by the COS B satellite. Ten previously unknown sources were discovered which appear to be galactic and which have typical gamma-ray luminosities of 10 to the 35th power erg/s above 100 MeV. The latitude distribution of the sources is taken as an immediate indication of …
COS-B observations of pulsed gamma -ray emission from PSR 0531+21 and PSR 0833-45.
Bignami, G. F.; Hermsen, W.; Masnou, J. L. +11 more
Summary. CO S-B has performed detailed measurements of the high-energy y-ray emission from the Crab and Vela pulsars. The two pulsars exhibit very similar y-ray light curves, both with narrow peaks of roughly equal intensity separated by 0.42+0.03 of the period. The fractions of the y-rays of energy >50 MeV which are pulsed have 2a lower limit …
Search for gamma-ray emission with a 4.8 h periodicity from Cygnus X-3.
Hermsen, W.; Bennett, K.; Mayer-Hasselwander, H. A. +3 more
Summary. The ESA CO S-B satellite has investigated the high energy gamma-ray emission from the Cygnus region of the galaxy during November to December 1975. From the counts observed to originate within the vicinity of Cygnus X-3 a histogram is derived using the 4.8 hour period observed at X-ray and infra-red wavelengths. The phase analysis reveals…
Increase in the pulsational period of 3U 0900-40.
Molteni, D.; Kanbach, G.; Mayer-Hasselwander, H. A. +4 more
The binary X-ray source 3U0900-40 has been observed with the X-ray detector on board the COS-B satellite between 1975 November 8.4 and 28.1 in the energy range 2-12 keV. Previously observed 283 s pulsations have been detected and were used to determine the binary orbital elements of the system. It is found that the pulsational period for November …
COS-B observations of localised high-energy gamma-ray emission from the anticentre region of the galactic disc.
Bignami, G. F.; Hermsen, W.; Bennett, K. +10 more
Summary. COS-B has observed sources of high-energy gamma rays in the anticentre region of the galactic disc. Only one of these (the Crab) can be positively identified with a source of radiation at other wavelengths. One of the other three (at 111 = 1960, b11 = +40) has been previously observed by SAS-2, but the others (at 111 = 1770, b11 = 70 and …
COS-B observations of X-ray emission from Cir X-1.
Maccagni, D.; Bignami, G. F.; della Ventura, A. +1 more
Summary The X-ray detector monitor on board the ESA satellite COS-E has observed the region of Cir X-1 (3U 1516-56), during 1976 February 24 through March 24. Two peaks of enhanced X-ray emission are clearly visible and confirm the periodic behavior of this source, as reported by Kaluziensky et al. (1976). The between the two adjacent maxima is 16…
COS-B Results on a Search for Pulsed Gamma-ray Emission from Radio Pulsars
Bignami, G. F.; Hermsen, W.; Boella, G. +14 more
Gamma-ray data from ESA's satellite COS-B have been used in a search for pulsed gamma-ray emission from sources located in regions near the galactic plane. For this search, the radio data from a number of pulsars were used. Due to the inadequacy of the available radio pulsar parameters, which had to be derived by extrapolation from observations ma…
Gamma Ray Astronomy
Pinkau, K.
Results of gamma-ray astronomy in the energy range above 1 MeV are reviewed. COS-B observations of galactic and extragalactic gamma rays are described. It is concluded that: (1) the cosmic-ray intensity in the galactic disk appears to decrease in the anticenter direction beyond the sun; (2) supernova or pulsar production of a sudden injection of c…
A Test for the Origin of Galactic Gamma Rays
Schlickeiser, R.; Thielheim, K. O.
From measured COS B gamma-ray data it is possible to derive the variation of the ratio of the galactic gamma-ray flux in the two energy intervals 70-300 MeV and 300-2000 MeV as a function of galactic latitude for two longitudinal regions. It is shown that this energy ratio is a good test to discriminate between a more proton and a more electron in…
COS-B Observations of Localised Gamma-Ray Emission
Bignami, G. F.; Hermsen, W.; Masnou, J. L. +12 more
The ESA gamma-ray satellite COS-B has completed a survey of the galactic plane. The long exposure time combined with the effective angular resolution of ~2.5 deg (FWHM) for gamma rays above 100 MeV permits a detailed study of the spatial distribution of the radiation. In four observation periods a search for localised gamma-ray emission has been p…