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Title:
Multiwaveband Observations of the TeV Blazar PKS 2155-304 with HESS, Fermi, RXTE and Swift
Authors:
Chiang, James; Giebels, B.; Fermi LAT Collaboration; H. E. S. S. Collaboration
Affiliation:
AA(Stanford Linear Accelerator Center), AB(LLR Ecole Polytechnique, France), AC(), AD()
Publication:
American Astronomical Society, AAS Meeting #213, #355.02; Bulletin of the American Astronomical Society, Vol. 41, p.497
Publication Date:
01/2009
Origin:
AAS
Bibliographic Code:
2009AAS...21335502C

Abstract

We report on the recent (26 Aug--5 Sep 2008) multiwaveband campaign (radio to TeV) of the highly variable, "high peaked" blazar PKS 2155-304. These observations were performed by the RXTE, Swift, and H.E.S.S. observatories and were coordinated with data taken by the Large Area Telescope (LAT) aboard the recently launched Fermi Gamma-ray Space Telescope satellite. Since these are the first multiwaveband observations that include simultaneous coverage in the 100 MeV-300 GeV band, they provide new, more stringent constraints on models of jet emission in this source, including a direct measurement of the apparent overall luminosity of the high energy component of the SED. The X-ray and TeV data show significant variability on the 1--2 day time scale, even though the source remained in a relatively low state in the TeV for the duration of the campaign. The time-averaged LAT and H.E.S.S. data are roughly consistent with a single inverse-Compton component for the high energy part of the overall SED, but the flux and spectral variability seen in the X-ray, GeV, and TeV bands on shorter time scales will strongly test the various competing models of blazar emission. In particular, detailed study of the spectral shapes and correlated variability in the X-ray and TeV bands will determine the Doppler factor of the jet outflow as well as the properties and acceleration and energy loss mechanisms of the highest energy particles, while the overall energetics imposed by the LAT data will constrain the particle, radiation, and magnetic field content of the emitting material.
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