Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30...47h&link_type=abstract
(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie
Astronomy and Astrophysics
Astronomy
29
Active Galaxies, Ariel Satellites, Bl Lacertae Objects, Galactic Radiation, Seyfert Galaxies, X Ray Spectra, Line Spectra, Proportional Counters, Spectrum Analysis, X Ray Sources
Scientific paper
The Leicester University instrument on the Ariel-6 satellite was used to obtain X-ray spectra in the 1-50 keV energy range of the BL Lac object Mkn 421 and several Seyfert type galaxies, IIIZw2, MCG8-11-11, and NGC 4151. The Mkn 421 spectrum is best represented by two power law components, the soft component having alpha approximately equal to 3.4 and the hard flux having alpha approximately equal to 1.0. The Ariel-6 spectrum of MCG8-11-11 can be fitted by a power law of alpha approximately equal to 2.1 together with an iron line at approximately 6.2 keV with an equivalent width of approximately 1.6 keV. The first X-ray spectrum of IIIZw2 fits with a power law having an index of approximately 1.7. With the exception of NGC 4151 there is no evidence for a significant column of cool material along the line of sight.
Hall Rob
Page Clive G.
Pounds Kenneth A.
Ricketts M. J.
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