BL Lacertae: the multiwavelength campaign of 2000

Details BL Lacertae: the multiwavelength campaign of 2000 BL Lacertae: the multiwavelength campaign of 2000

2002-10-18

arxiv.org/abs/astro-ph/0210415v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures; to appear in the proccedings of the V Italian Conference on AGNs

Scientific paper

We present two BeppoSAX observations of BL Lacertae as part of a multiwavelength radio-to-TeV campaign. During the first observation we observe a faint Compton spectrum, while during the second, we detect a synchrotron spectrum with the highest [2-10] keV flux ever measured; above 10 keV an inverse Compton component begin to dominate. The synchrotron flux is very variable with time scales of 1 hr. We describe four different SED shifting the synchrotron peak both in frequency and flux intensity and we sketch a scenario in which a blob moves along a jet and can be located in or outside the BLR. This implies different radiative mechanism at work, SSC or external Compton, producing different high energy spectra.

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