BeppoSAX monitoring of the BL Lac Mkn 501

Details BeppoSAX monitoring of the BL Lac Mkn 501 BeppoSAX monitoring of the BL Lac Mkn 501

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410.1412p&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 1412-1416 (1997).

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Active And Peculiar Galaxies And Related Systems, Gamma-Ray, X-Ray, Magnitudes And Colors, Luminosities

Scientific paper

The BL Lac object Mkn 501 was observed with the BeppoSAX satellite on 7, 11, and 16 April 1997 during a phase of high activity at TeV energies, as monitored with the Whipple, HEGRA and CAT Cherenkov telescopes. Over the whole 0.1-200 keV range the spectrum was exceptionally hard (α<=1, with Fν~ν-α) indicating that the X-ray power output peaked at (or above) ~100 keV. This represents a shift of at least two orders of magnitude with respect to previous observations of Mkn 501, a behavior never seen before in this or any other blazar. The overall X-ray spectrum hardens with increasing intensity and, at each epoch, it is softer at larger energies. The correlated variability from soft X-rays to the TeV band points to models in which the same population of relativistic electrons produces the X-ray continuum via synchrotron radiation and the TeV emission by inverse Compton scattering of the synchrotron photons or other seed photons.

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