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MeV synchrotron BL Lacs
Gabriele Ghisellini
The recent BeppoSAX observations of the BL Lac objects Mkn 501 and 1ES 2344+514 have shown that the synchrotron spectrum of these objects peaks, in a v-vF(v) representation, at ene…
Fast X-ray Variability of PKS 2155-304: A Cross Correlation Analysis
A. Treves, Y. H. Zhang, A. Celotti +7
PKS 2155-304 is one of the prototypes of BL Lac objects. Its spectral energy distribution is known from the radio to the TeV band and has two peaks, one in the soft X-rays and the…
Extreme Synchrotron Blazars in Outburst: the Potentiality of INTEGRAL Imaging and Spectroscopy
Elena Pian, Giuseppe Malaguti, Laura Maraschi +2
Only ~10 blazars have been detected in soft gamma-rays by OSSE and the PDS, often in flaring state. We investigate the impact of the imaging and spectral capabilities of the IBIS i…
BeppoSAX Observations of the BL Lac Object Mkn 501 in an Intermediate State
Elena Pian, Eliana Palazzi, Lucio Chiappetti +8
The BL Lac object Mkn 501 was observed with the BeppoSAX satellite at three epochs in April-May 1998, simultaneously with the Whipple and HEGRA Cherenkov telescopes. The X-ray spec…
Rapid variability of BL Lacs and time lags: what can we learn?
Marco Chiaberge, Annalisa Celotti, Gabriele Ghisellini
The quasi-symmetric shape of the lightcurves, as seen in the X-rays and in the optical, together with the fast variations of the flux observed, suggest that the cooling time for th…
Blazars: recent developments
Gabriele Ghisellini
Recent observational and theoretical results on blazars are presented and discussed. We are beginning to understand the rich phenomenology of blazars, and we are finding trends whi…