BeppoSAX Observations of PKS 2155-304 during an active Gamma-ray State

Details BeppoSAX Observations of PKS 2155-304 during an active Gamma-ray State BeppoSAX Observations of PKS 2155-304 during an active Gamma-ray State

1998-08-18

arxiv.org/abs/astro-ph/9808177v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, latex-macros memsait.sty, epsf.sty, to be published in the proceedings of the conference "Dal nano al Tera

Scientific paper

PKS 2155-304 was observed with BeppoSAX in November 1997 for 64 ksec (total elapsed time 33.5 hours) and, for the first time, simultaneously in gamma-rays with EGRET on board the Compton Gamma Ray Observatory and with the ground based TeV telescope CANGAROO, during a phase of high brightness in the X-ray band. The LECS and MECS light curves show a pronounced flare (with an excursion of a factor 3.5 between min and max), with evidence of spectral hardening at maximum intensity. The source is weakly detected by the PDS in the 12-100 keV band with no significant evidence of variability. The broad band X-ray data from Beppo SAX are compared with the gamma-ray results and discussed in the framework of homogenous synchrotron self Compton models.

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