High energy x-ray observations of BL Lacertae objects

Technical Report · Thu Feb 01 00:00:00 EST 1979

OSTI ID:5637212

Coe, M J; Dennis, B R; Dolan, J F; Crannell, C J; Frost, K J

BL Lac objects are of considerable current interest both because they were recently realized to be a new class of objects and because they were found to be similar in many significant respects to QSOs and Seyfert Galaxies. Since at least one model for the X-ray emission predicts a flattening of the X-ray spectrum above a few keV, several of these sources were studied using the high energy scintillation telescopes on OSO-8 and Ariel-5. With the possible exception of Markaryan 421, only upper limits were obtained for the X-ray emission in the energy ranges 25-60 and 60-130 keV, these results thus imposing constraints on any spectral breaks.

• Research Organization: National Aeronautics and Space Administration, Greenbelt, MD (USA). Goddard Space Flight Center
• OSTI ID: 5637212
• Report Number(s): N-79-20943; TRN: 80-003652
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC X-RAY SOURCES
X-RAY SPECTRA
ARIEL SATELLITES
EMISSION SPECTRA
ORBITING SOLAR OBSERVATORIES
QUASARS
SEYFERT GALAXIES
TELESCOPES
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
GALAXIES
SATELLITES
SPECTRA
640103* - Astrophysics & Cosmology- Quasi-Stellar
Radio
& X-Ray Sources- (-1987)