Broadband spectra and variability of BL Lacertae in 2000

Details Broadband spectra and variability of BL Lacertae in 2000 Broadband spectra and variability of BL Lacertae in 2000

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre11005b&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We have organized an extensive multiwavelength campaign on BL Lacertae in the fall of 2000. Simultaneous or quasi- simultaneous observations were taken at radio frequencies, in the optical - carried out by the WEBT collaboration -, in X-rays - using BeppoSAX and RXTE -, and at VHE gamma- rays with the CAT and HEGRA Cherenkov telescope facilities. The WEBT optical campaign achieved an unprecedented, almost continuous time coverage during several 10 - 15 hr periods, and revealed surprising intraday variability patterns. The BeppoSAX observations around Nov. 1, 2000, showed a steep soft X-ray spectrum, consistent with the synchrotron component extending out to 10 keV. The spectral variability at soft to medium-energy X-rays indicates that both synchrotron and Compton scattering provide non-negligible contributions to the electron cooling rates. Implications for spectral and variability models of BL Lacertae will be discussed.

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