Search for gamma-ray time variability of Cygnus X-3 and CG 195+4
Creators
- 1. CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Service d'Electronique Physique
- 2. Consiglio Nazionale delle Ricerche, Milan (Italy)
Description
The ESA COS-B satellite has investigated the high energy gamma ray emission from the Cygnus region of the galaxy during November and December 1975. From the counts observed to originate within the vicinity of Cygnus X-3 a phase histogram has been derived using the approximately 4.8 hours period observed at X-ray and I.R. wavelengths. The phase analysis reveals no evidence for a modulation of the gamma ray emission at the time of the COS-B observation. A detailed investigation of the short-term variability of the source CG 195+4 is presented. This source is found to pulsate with a period of 59.19687 sec and a period derivative of 1.385x10-9 with a multiple peak phase histogram, consistent with the SAS-2 results. The pulsed fraction above 100 MeV is 75+-25%. This preliminary study indicates also a harder pulsed energy spectrum than that of the Crab pulsar
Additional details
Publishing Information
- Imprint Title
- Recent advances in gamma-ray astronomy
- Journal Page Range
- p. 33-37.
- Report number
- ESA-SP--124
Conference
- Title
- 12. ESLAB symposium on recent advances in gamma-ray astronomy.
- Dates
- 24 - 27 May 1977.
- Place
- Frascati, Italy.
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 9393646
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Resource subtype / Literary indicator
- Conference, Non-conventional Literature
- Descriptors DEI
- COSMIC GAMMA SOURCES; COSMIC RAY FLUX; DATA; MEV RANGE 10-100; MEV RANGE 100-1000; POLAR REGIONS; PULSES; SATELLITES; SPATIAL DISTRIBUTION; TIME DEPENDENCE; VARIATIONS
- Descriptors DEC
- COSMIC RAY SOURCES; DISTRIBUTION; ENERGY RANGE; INFORMATION; MEV RANGE; RADIATION FLUX