Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984xue..conf...99k&link_type=abstract
In Max-Planck Inst. für Physik und Astrophysik X-Ray and UV Emission from Active Galactic Nuclei p 99-101 (SEE N85-17790 08-88)
Astronomy and Astrophysics
Astronomy
Bl Lacertae Objects, Emission Spectra, Galactic Nuclei, X Ray Spectra, Active Galactic Nuclei, Heao 1, Heao 2, Light Curve, Luminous Intensity, Periodic Variations, Spaceborne Astronomy
Scientific paper
Satellite TENMA observed the X-ray emission from the active galactic nuclei of the BL Lac object PKS 2155-304. The net X-ray intensity from 2 to 6 keV was obtained in each orbit. The light curve on 1 and 3 October is shown. The average intensity from 2 to 10 keV in each day is 8.6 and 8.8 times 10 to the minus 11th power erg/sec sqcm, comparable to the intensity in 1978 by HEAO-1 but 3 times larger than in 1979 by HEAO-2. An intensity variation by a factor of 2 in 4hr is seen on 1 October. Each energy spectrum can be simulated by a power law spectrum with a fixed value of NH = 2 times 10 to the 20th power H/sqcm. The photon indices and the intensities on 1 and 3 October are not appreciably different from one another. The deconvolved spectrum of whole data is shown.
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