Hard X-ray observation of NGC 4151 with the Mifraso telescope

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168854· OSTI ID:6600965

Perotti, F; Buratti, R; Maggioli, P; Quadrini, E; Bazzano, A ^[1]

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1. 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), Journal Name: Astrophysical Journal; (USA) Vol. 356; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AIRSHIPS
BALLOONS
COSMIC RADIO SOURCES
CRAB NEBULA
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
GALAXIES
HARD X RADIATION
IONIZING RADIATIONS
NEBULAE
RADIATIONS
SEYFERT GALAXIES
SPECTRA
SPECTROSCOPY
SUPERNOVA REMNANTS
SURVEYS
TELESCOPES
X RADIATION
X-RAY SPECTRA