Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.232..793g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 232, June 15, 1988, p. 793-808.
Astronomy and Astrophysics
Astronomy
64
Markarian Galaxies, Ultraviolet Spectra, X Ray Sources, X Ray Spectra, Bl Lacertae Objects, Exosat Satellite, Iue, Spectrum Analysis
Scientific paper
The authors present the results of a detailed study of the BL Lacertae type object Markarian 421 (Mrk 421) based upon EXOSAT and IUE observations made during 1984 and 1985. In the X-ray band Mrk 421 exhibits significant variability on time-scales typically of the order of a day. The majority of the observations showed the source to be in a "low", soft state in which the spectral index and 2-6 keV flux are well correlated in the sense that the source hardens as it brightens. However, during a period of at least 3 days in 1984 December the source entered a hard, "outburst" state during which the spectral index remained at ≡1. In contrast, at ultraviolet wavelengths Mrk 421 exhibits only slow drifts in flux on a time-scale of weeks and little change in spectral index. The authors show that a canonical relativistic jet model can adequately explain the multi-waveband spectra at all epochs.
Bromage Gordon E.
George Ian Michael
Warwick Robert S.
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