High energy X-ray observations of BL Lacertae objects

Journal Article · Mon Jan 01 00:00:00 EST 1979 · Astrophys. Lett.; (United States)

OSTI ID:5023561

Coe, M J ^[1]; Dennis, B R ^[2]

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1. NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, Md.
2. Imperial College of Science and Technology, London, England

Several BL Lacertae objects were observed at energies above 25 keV using the scintillation telescopes on OSO-8 and Ariel-5. With the possible exception of Markaryan 421, only upper limits were obtained for the existence of X-ray emission in the energy ranges 25-60 and 60-130 keV. These results impose constraints on any flattening in the X-ray spectrum of BL Lac objects as predicted by at least one model for their X-ray emission.

• OSTI ID: 5023561
• Journal Information: Astrophys. Lett.; (United States), Vol. 20
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BL LACERTAE OBJECTS
X-RAY SPECTRA
ARIEL SATELLITES
COSMOLOGICAL MODELS
ENERGY SPECTRA
KEV RANGE 10-100
KEV RANGE 100-1000
ORBITING SOLAR OBSERVATORIES
PHOTONS
TELESCOPES
COSMIC RADIO SOURCES
ELEMENTARY PARTICLES
ENERGY RANGE
KEV RANGE
MASSLESS PARTICLES
MATHEMATICAL MODELS
SATELLITES
SPECTRA
640103* - Astrophysics & Cosmology- Quasi-Stellar
Radio
& X-Ray Sources- (-1987)