Search Publications
On gamma-ray sources, supernova remnants, OB associations, and the origin of cosmic rays.
Montmerle, T.
Spatial coincidences between supernova remnants and OB associations or H II regions are sought, and a list of about 30 objects (referred to as 'SNOBs') is obtained. On the basis of COS B data it is found that five, or perhaps six, of 11 as-yet unidentified gamma-ray sources are associated with SNOBs and that as many as three-fourths of the best-id…
The accretion picture of Cen X-3 as inferred from one month of continuous X-ray observations.
van der Klis, M.; Bonnet-Bidaud, J. M.
COS-B X-ray observations of Cen X-3 in December 1975 include a turn-on of the source and a high state extending over the rest of the observation period, during which a clear transition in intensity occurs. These data are used to show that the accretion picture of Cen X-3 is reconcilable with a stellar wind only by taking the most extreme assumptio…
Maximum-entropy image processing in gamma-ray astronomy.
Strong, A. W.; Bennett, K.; Skilling, J.
In order to make the fullest use of the information contained in data from a spark-chamber telescope, an image processing approach, is required. It is shown how the maximum-entropy reconstruction technique can be applied in a modification appropriate to a situation of low statistical weight per resolution solid angle, as usually occurs with presen…
Gas, dust, high energy particles and star formation in the Galactic Center
Puget, J. -L.; Lequeux, J.; Audouze, J. +1 more
The amount of gas and dust in the Galactic Center is evaluated. The COS-B and SAS-2 gamma-ray observations of the Galactic Center are discussed and limits for the flux of high-energy cosmic rays are derived from them. Consideration is given to low-energy cosmic rays which are indirectly responsible via their interaction of the interstellar matter,…
Gamma rays from the Cygnus region and the nature of CG 78+1.
Strong, A. W.; Wolfendale, A. W.; Protheroe, R. J.
Interpretation of the galactic gamma-ray flux above 100 MeV has been complicated by the presence of a component due to 'point' sources of gamma-rays and by the lack of measurements of the molecular hydrogen (except along the galactic equator) which forms a large fraction of the interstellar medium (ISM). Recent CO observations of the Cygnus X regi…
A geometrical analysis of the gamma-ray light curves of pulsars.
Massaro, E.; Buccheri, R.; Salvati, M.
In the light curves of the COS-B gamma-ray pulsars, some common features are clearly recognizable; two main peaks always occur, and the intervening phase lag has not the natural value of 0.5. An interpretation is proposed which only involves a simplified geometrical description of the emission pattern, viz. two opposite hollow cones with a first-o…
Ariel 5 Hard X-Ray Observations
Coe, M. J.; Quenby, J. J.; Engel, A. R.
Results from the hard X-ray detector (8 cm2 area, 8 degrees f.w.h.m. field of view, energy range 26-1200 keV) are reviewed in the context of observations by other groups. At least three different classes of galactic sources are studied by this detector. In the first, magnetospheric control of the emission, which seems to be a modified t…