Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.287g&link_type=abstract
In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 287-291 (SEE N89
Astronomy and Astrophysics
Astronomy
4
Bl Lacertae Objects, Ultraviolet Astronomy, Ultraviolet Spectra, X Ray Astronomy, Active Galactic Nuclei, Galactic Radiation, Iue, Spaceborne Astronomy, X Ray Spectra
Scientific paper
The BL Lac type objects Mrk 421, Mrk 501, Mrk 180 and 1218+304 were studied in the ultraviolet and X-ray bands. In the UV, these objects typically exhibit slow drifts in flux (on a timescale of weeks or longer) with little change in spectral index. Such behavior contrasts with that in the X-ray band where variability occurs on much shorter timescales often with a correlation apparent between X-ray flux and spectral index in the sense that the spectrum hardens as the source brightens. The UV to X-ray continuum in these sources generally exhibits a steepening at high energies, with the observed X-ray variability consistent with a pivoting of the X-ray spectrum about a break-point at 0.1 keV. The implications of such behavior for the standard synchrotron self-Compton model of BL Lac objects, is discussed. Inhomogeneous models may be more appropriate.
Bromage Gordon E.
George Ian Michael
Warwick Robert S.
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