HEAD Division Meeting 1999, April 1999
Session 3. Blazars
Poster, Monday, April 12, 1999, 8:30am-6:10pm, Gold Room

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[3.04] A long BeppoSAX observation of the Blazar MKN 421

E. Fontana, S. Molendi (IFC/CNR)

We report on a long BeppoSAX observation of the BL Lac MRK421 performed from the 29th of April to the 5th of May 1997. The source displays variability on a timescale of ~ 1 day. The spectrum apperars to harden as the source becomes brighter. The time average spectrum is well fitted by a broken power-law with a break energy of 1 keV. Intensity resolved spectral analysis shows that the break-energy, does not change. In the low intensisty state, at high energies (> 10 keV), the source shows evidence of a spectral hardening, most likely due to an inverse-Compton component.

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