Search Publications
Multicomponent Analysis of Total Cos-B Gamma-Ray Data at Intermediate Latitudes
Strong, A. W.; Mayer-Hasselwander, H. A.; Bloemen, J. B. G. M. +1 more
The final COS-B database has been used to study the gamma-ray emission in the latitude range 10° < |b| < 20° in terms of a four component model. The emissivity spectrum of the local interstellar medium is derived and compared with that found in previous studies. The intensity of the inverse-Compton component is determined from the fitting pr…
Cos-B Gamma-Ray Sources and Interstellar Gas
Caraveo, P. A.; Bignami, G. F.; Strong, A. W. +8 more
Of the gamma-radiation observed above 100 MeV only a few percent is due to the catalogued sources which are viewed against intense background mission from the Galactic plane. There has been considerable recent success in modelling the Galactic plane emission as the interactions of cosmic rays with atomic and molecular interstellar gas; Bloemen, et…
CYG X-3: not Seen in High-Energy Gamma Rays by Cos-B
Caraveo, P. A.; Bignami, G. F.; Strong, A. W. +7 more
COS-B had Cyg X-3 within its field of view during 7 observation periods between 1975 and 1982 for in total approximately 300 days. In the skymaps (70 meV E 5000 meV) of the Cyg-X region produced for each of these observations and in the summed map, a broad complex structure is visible in the region 72 deg approximately less than 1 approximately le…
Search for Periodicities Near 59 S in the Cos-B Gamma-Ray Data of 2CG 195+04 (geminga)
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +5 more
The COS-B data relating to five observations in the general direction of Geminga, spanning 6.7 years, were searched for pulsation near 59 s. The SAS-2 indication is not confirmed. An indication of a 59 s pulsation in the gamma ray emission from 2CG195+04 (Geminga) was reported. Early analysis of COS-B data supported the result while later improved…
The Golactic Gamma-Ray Distribution and the Radial Cosmic Ray Gradient
Harding, A. K.; Stecker, F. W.
The authors have derived the radial distribution of gamma-ray emissivity and the cosmic ray intensity in the Galaxy using the final SAS-2 results, the recently corrected COS-B results, and recent CO surveys of the northern and southern galactic hemispheres. In addition to the "5 kpc ring" of enhanced emission, there is evidence for spiral features…
Inverse-Compton Gamma Rays in the Galaxy
Bloemen, J. B. G. M.
Compton gamma rays with energies 1 MeV largely results from scattering between electrons, with energies 100 MeV, and photons in the optical and infrared range and the 2.7 K universal blackbody radiation. An empirical model of the inverse Compton (IC) gamma ray production in the Galaxy is presented, using the most recent estimate of the interstella…
Constraints on the Galactic Distribution of Cosmic Rays from the Cos-B Gamma-Ray Data
Strong, A. W.; Hermsen, W.; Lebrun, F. +7 more
The diffuse component of the galactic high energy gamma rays results mainly from the interaction of CR nuclei and electrons with the nuclei of the interstellar gas. An additional contribution is obtained from the interaction of CR electrons with the interstellar photons through the inverse-Compton (IC) process. Gamma ray astronomy therefore offers…