Gamma-ray spectrum of Centaurus A: a high-resolution observation between 70 keV and 8 MeV
Description
The NASA/Goddard Space Flight Center Low Energy Gamma ray Spectrometer (LEGS) observed the nearby active nucleus galaxy Centaurus A (NGC 5128) during a balloon flight on 1981 November 19. There is no evidence of a break in the spectrum or of any line features. The 1.6 MeV limit is a factor of 8 lower than the 1974 line flux, indicating that, if the 1974 feature was real, and, if it was narrow, then the line intensity decreased significantly between 1974 and 1981. The lack of observed annihilation radiation from Cen A, combined with the temporal variations that are seen in the X-ray and gamma-ray intensities, constrain the size of the emission region to be between 10 to the 13th power and 5 x 10 to the 17th power cm
Availability note (English)
MF available from INIS under the Report Number; Available from NTIS, PC A03/MF A01.
Files
Restricted
The record is publicly accessible, but files are restricted to users with access.
Additional details
Publishing Information
- Imprint Pagination
- 30 p.
- Report number
- N--83-35990
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 16019344
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- GALAXY NUCLEI; GAMMA SPECTRA; RADIO GALAXIES; X RADIATION
- Descriptors DEC
- COSMIC RADIO SOURCES; ELECTROMAGNETIC RADIATION; GALAXIES; IONIZING RADIATIONS; RADIATIONS; SPECTRA
Optional Information
- Secondary number(s)
- NASA-TM--85081.