Hard X-ray observation of NGC 4151 with the Mifraso telescope
Journal Article
·
· Astrophysical Journal; (USA)
- CNR, Istituto di Fisica Cosmica, Milan (Italy) CNR, Istituto di Astrofisica Spaziale, Frascati (Italy)
During a balloon flight on July 29, 1986 of the Mifraso telescope, a region of the sky containing the Seyfert galaxy NGC 4151 was studied over the photon energy range 15-300 keV. A 5.5 sigma excess, interpreted as originating from the direction of NGC 4151, was detected in the energy band 27-80 keV. The corresponding emission spectrum may be represented by a single power law with a photon spectral index of alpha = 1.5 + or - 0.6. The result is compared to previous hard X-ray observations of this source. Apart from this measurement, an observation of the Crab Nebula as an in-flight calibration source of the telescope is described. 33 refs.
- OSTI ID:
- 6600965
- Journal Information:
- Astrophysical Journal; (USA), Vol. 356; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SEYFERT GALAXIES
HARD X RADIATION
BALLOONS
CRAB NEBULA
EMISSION SPECTRA
SPECTROSCOPY
SURVEYS
TELESCOPES
X-RAY SPECTRA
AIRSHIPS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
GALAXIES
IONIZING RADIATIONS
NEBULAE
RADIATIONS
SPECTRA
SUPERNOVA REMNANTS
X RADIATION
640105* - Astrophysics & Cosmology- Galaxies
GENERAL PHYSICS
SEYFERT GALAXIES
HARD X RADIATION
BALLOONS
CRAB NEBULA
EMISSION SPECTRA
SPECTROSCOPY
SURVEYS
TELESCOPES
X-RAY SPECTRA
AIRSHIPS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
GALAXIES
IONIZING RADIATIONS
NEBULAE
RADIATIONS
SPECTRA
SUPERNOVA REMNANTS
X RADIATION
640105* - Astrophysics & Cosmology- Galaxies