Upper limits to the annihilation radiation luminosity of Centaurus A
Conference
·
· AIP Conf. Proc.; (United States)
OSTI ID:6095327
A high-resolution observation of the active nucleus galaxy Centaurus A (NGC 5128) was made by the GSFC Low Energy ..gamma..-ray Spectrometer (LEGS) during a balloon flight on 1981 November 19. The measured spectrum between 70 and 500 keV is well represented by a power law of the form 1.05 x 10/sup -4/ (E/100 keV)/sup -1/ /sup 59/ ph cm/sup -2/ s/sup -1/ with no breaks or line features observed. The 98% confidence (2sigma) flux upper limit for a narrow (< 3 keV) 511-keV positron annihilation line is 9.9 x 10/sup -4/ ph cm/sup -2/ s/sup -1/ Using this upper limit, the ratio of the narrow-line annihilation radiation luminosity to the intergral > 511 keV luminosity is estimated to be < 0.09 (2sigma upper limit). This is compared with the measured value for our galactic center in the Fall of 1979 of 0.10-0.13, indicating a difference in the emission regions in the nuclei of the two galaxies. 16 references, 1 figure.
- Research Organization:
- NASA/Goddard Space Flight Center, Greenbelt, MD
- OSTI ID:
- 6095327
- Report Number(s):
- CONF-830136-
- Conference Information:
- Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 101
- Country of Publication:
- United States
- Language:
- English
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Upper limits to the annihilation radiation luminosity of Centaurus A
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Related Subjects
640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
COMPARATIVE EVALUATIONS
COSMIC GAMMA SOURCES
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
GALAXIES
GALAXY NUCLEI
GAMMA RADIATION
INTERACTIONS
IONIZING RADIATIONS
LEPTONS
LIMITING VALUES
LUMINOSITY
MILKY WAY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
POSITRONS
RADIATIONS
RADIO GALAXIES
SPECTRA
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNIHILATION
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
COMPARATIVE EVALUATIONS
COSMIC GAMMA SOURCES
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
GALAXIES
GALAXY NUCLEI
GAMMA RADIATION
INTERACTIONS
IONIZING RADIATIONS
LEPTONS
LIMITING VALUES
LUMINOSITY
MILKY WAY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
POSITRONS
RADIATIONS
RADIO GALAXIES
SPECTRA