Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..897b&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 897-899 (SEE N90-258
Astronomy and Astrophysics
Astronomy
Seyfert Galaxies, Stellar Spectra, X Ray Astronomy, X Ray Sources, X Ray Spectra, Astronomical Models, Background Radiation, Balloon Flight, Quasars, Spectrum Analysis, Time Measurement, X Ray Telescopes
Scientific paper
The spectral data of three active galaxies, observed in the hard X-ray energy band during two balloon flights of the MIFRASO (Milan-Frascati-Southampton) telescope are presented. In the summer of 1986 only the Seyfert galaxy NGC 4151 was observed, while a year later the instrument pointed at the quasar 3C 273, the Seyfert galaxy MCG 8-11-11 and reobserved NGC 4151. The MIFRASO hard X-ray spectra are compared to other high energy measurements of the same objects. It is readily apparent that the emission from each source is variable in time. An analysis of archive data indicates that the power law continuum observed at soft X-ray energies extends with the same slope up to at least 200 keV and that the overall photon spectral index appear to remain substantially constant while the source intensity changes in time.
Bassani Loredana
Bazzano Angela
Court Andrew
Dean Anthony J.
Dipper Nigel
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