Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273...70m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 1, 1983, p. 70-74. Research supported by the Piano Spaziale Nazio
Astronomy and Astrophysics
Astronomy
16
Bl Lacertae Objects, Heao 2, Quasars, X Ray Spectra, Energy Spectra, Proportional Counters, Spaceborne Astronomy, Synchrotron Radiation
Scientific paper
Einstein Observatory simultaneous imaging proportional counter and monitor proportional counter data are combined in order to derive the energy spectra of the BL Lac objects PKS 0548-322 and 3C 66A between 0.2 and 10 keV. While the latter is found to be variable in both intensity and spectral shape, the former, although constant in the present data, is found to have experienced a spectrum variation in view of results from other experiments. Attention is given to the implications of flux and spectral variability in BL Lac objects for models of X-ray emission mechanisms. It is suggested that the wide spread of the spectral index distribution is due to the detection of the highly variable synchrotron-produced X-rays that are generally undetected in QSOs.
Maccacaro Tomasso
Maccagni Dario
Tarenghi Marco
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