2.7k citations · 27.5k across the 307 of their papers we have counts for
7 papers · 1 filter
The 0.1-200 keV spectrum of the blazar PKS 2005-489 during an active state
G. Tagliaferri, G. Ghisellini, P. Giommi +8
The bright BL Lac object PKS 2005-489 was observed by BeppoSAX on November 1-2, 1998, following an active X-ray state detected by RossiXTE. The source, detected between 0.1 and 200…
Two BeppoSAX observations of BL Lac
G. Tagliaferri, G. Ghisellini, M. Ravasio +14
We present the results of two ToO BeppoSAX observations of BL Lac. During the first observation we detected both the synchrotron and the Compton components. Fast time variability w…
Hard synchrotron BL Lacs: the case of 1ES 1101-232
Anna Wolter, Gabriele Ghisellini, Gianpiero Tagliaferri +2
The bright X-ray selected BL Lac object 1ES1101--232 shows a flat X-ray spectrum, making it detectable with high statistics over the wide BeppoSAX energy range. We have observed it…
Looking for High Energy Peaked Blazars
L. Costamante, G. Ghisellini, A. Celotti +10
Blazars can be classified on the basis of their overall Spectral Energy Distribution (SED). BL Lac objects are usually divided in LBL or HBL (Low or High energy peaked BL Lacs), ac…
Synchrotron and Compton Components and their Variability in BL Lac Objects
P. Giommi, G. Ghisellini, P. Padovani +1
BL Lacertae objects are extreme extragalactic sources characterized by the emission of strong and rapidly variable nonthermal radiation over the entire electromagnetic spectrum. Sy…
New Extreme Synchrotron BL Lac Objects
L. Costamante, G. Ghisellini, P. Giommi +10
We report on the BeppoSAX observations of four "extreme" BL Lacs, selected to have high synchrotron peak frequencies. All have been detected also in the PDS band. For 1ES 0120+340,…