Search Publications
Reexamination of discrete sources with ????b > 20 from COS-B data
Ma, Y.; Luo, Y.; Yu, K. N. +1 more
Using the cross-correlation and bootstrap sampling methods, the COS-B data in the observations with I b I > 20° are re-examined to search for discrete sources. Two source features have been identified and the possible counterparts are the pulsar PSR0950+08 and the weak
Search for Gamma Rays of Energies E > 10**15 EV from Discrete Sources
Samorski, M.; Stamm, W.
The data of the extensive air shower experiment at Kiel have been systematically scanned for possible gamma-ray sources in the energy range E > 1015eV and declination range δ = 25° - 75°. Photon fluxes for the six statistically most significant source candidates and 3 σ upper limit photon fluxes for COS B gamma-ray sources are presen…
Diffuse Galactic Emission of High Energy Gamma Rays
Hartman, R. C.; Fichtel, C. E.; Kniffen, D. A.
A study of the gamma-radiation produced by the interaction of cosmic rays with the interstellar matter and photons is extended, based on recent COS-B satellite results and background estimates (1982) and evaluations of the 21-cm radiation in the Galaxy. Gamma-ray intensities predicted over the latitude range of -10 to 10 degrees for energy ranges …
COS-B measurements of high-latitude gamma rays and evidence for a component not related to the gas.
Caraveo, P. A.; Bignami, G. F.; Strong, A. W. +7 more
The gamma ray latitude distribution for absolute value of b between 10 deg and 90 deg measured by COS-B is compared with the expected emission from cosmic-ray/gas interactions. An additional component is found which is unrelated to the gas, and which may be interpreted as a gamma-ray 'halo'. The possibility of an inverse-Compton origin is discusse…
COS-B upper limits on gamma-ray emission from radio pulsars.
Caraveo, P. A.; Bignami, G. F.; Strong, A. W. +13 more
The authors report on the results of a search for pulsed gamma-ray emission from old radio pulsars in the COS-B data in the energy range 50 MeV to 2 GeV. The analysis has been done by using either pulsar parameters obtained in simultaneous radio and gamma-ray observations or parameters which could be reliably derived by interpolation from radio ob…
Further COS-B evidence for gamma-ray emission from 3C273
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +7 more
The results of a third observation of the Virgo region of the sky by the ESA gamma-ray satellite COS-B are reported. The gamma-ray source (CG291 plus 65) was again seen, and the combined data are analyzed to improve on the position and time-averaged energy spectrum of the source. During the observation, the number of photons from the instrumental …
Observation by COS-B of the gamma-ray source 2CG195/plus/04
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +7 more
Data accumulated from observations of the high-energy gamma-ray source 2CG195(plus)04 are used to improve the position and energy spectrum of the source, and to search for short term variability. Skymaps from four observations in three energy ranges are analyzed using the cross-correlation method by Hermsen (1980), and results are within the error…
On a more extended correlation between COS-B gamma rays and interstellar matter in the Orion region
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +7 more
COS-B observations of gamma-ray emission from local galactic features
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +7 more
Evidence for large scale correlations between the high-energy photon sky and the known local distribution of diffuse interstellar matter is discussed. Evidence is presented of correlations with the Gould's Belt and the Dolidze Belt. The correlations indicate that the emission of gamma rays at medium latitudes can be explained by the distribution o…
History of the gamma-ray light curves of the pulsars PSR0531 plus 21 and PSR0833-45 as measured by COS-B
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +7 more