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

Details Hard X-ray observation of NGC 4151 with the MIFRASO telescope Hard X-ray observation of NGC 4151 with the MIFRASO telescope

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356..467p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 20, 1990, p. 467-471. Research supported by CNR.

Computer Science

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15

Astronomical Spectroscopy, Crab Nebula, Seyfert Galaxies, X Ray Astronomy, X Ray Spectra, Balloon Sounding, Emission Spectra, Sky Surveys (Astronomy), Telescopes

Scientific paper

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.

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