Search Publications
High-energy γ-ray light curve of PSR0531 + 21
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +8 more
The Crab pulsar (PSR0531 + 21) was one of the earliest identified sources of high-energy γ radiation1-6. As such it was selected as the first object of detailed study by ESA's γ-ray astronomy satellite COS B, launched in August 1975. The experiment and mission have been described elsewhere7. In the first 6 yr of operation COS…
Galactic γ and radio synchrotron radiation
Osborne, J. L.; Phillipps, S.; Haslam, C. G. T. +2 more
The galactic γ-radiation and radio synchrotron radiation contains information on the distribution of cosmic-ray particles, magnetic field and gas throughout the Galaxy. We report here a new all-sky survey of 408-MHz radio continuum which has been used to compare the distributions of radio and γ-ray emission, with the former convolved to the respon…
COS B observation of high-energy γ radiation from 3C273
Bignami, G. F.; Hermsen, W.; Masnou, J. L. +9 more
THE discovery of a high-energy γ-ray source at α(1950) = 12h 29 min+/-6 min, δ(1950)= +3°+/-1.5° is reported here. Arguments are given for the identification with 3C273. If this identification is correct, the γ-ray luminosity of 3C273 in the energy range 50-500 MeV is 2×1046 erg s-1 for H0 = 60 km s-1 Mp…
Hard X-ray observations of cosmic γ-ray sources
Coe, M. J.; Quenby, J. J.; Engel, A. R.
THE publication1, by workers using the COS B satellite, of a list of 13 discrete cosmic γ-ray sources has aroused considerable interest. Attention has mainly been focussed on attempts to identify all or some of these sources with known X-ray sources2-4, optical sources5,6, radio sources7 and HII regions<…
Possible X-ray counterparts of gamma-ray sources.
Maraschi, L.; Bradt, H.; Apparao, K. M. V. +5 more
The results are presented of a survey regarding the X-ray source positions which fall within the error boxes of 10 unidentified gamma-ray sources observed with the aid of the COS-B satellite. In three cases, including CG 135-1, CG 312-1, and CG 327-0, an X-ray source was found within the gamma-ray error box. However, because of the large uncertain…
Observability of gamma-ray pulsars.
Massaro, E.; Buccheri, R.; Scarsi, L. +1 more
Attention is given to the Crab (PSR 0531 plus 21) and Vela (PSR 0833 minus 45) pulsars in a study of pulsed energy release in the gamma-ray channel; with a gamma-ray/radio luminosity ratio on the order of one million. SAS 2 and COS B data are analyzed in an attempt to detect possible gamma-ray emission from other known radio pulsars. A phenomenolo…
Coincidence of compact supernova remnants with three COS-B γ-ray sources
Lamb, R. C.
POSITIONAL coincidences and a `near miss' of four small-diameter supernova remnants (SNR) with three of the 11 unidentified COS-B γ-ray sources1 are reported here. I argue that it is unlikely that all four SNR-γ-ray source associations are accidental, and that their compactness probably indicates that their ages are not greater than abo…
On the identification of celestial γ-ray sources
Massaro, E.; Scarsi, L.
THE observations from COS B have provided a new and more detailed picture of the high energy γ-ray emission from the Galaxy. We discuss here the first catalogue with 13 localised sources which has been compiled1,2 and how the list should lengthen in the near future, as the data analysis progresses.
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 …