Wide band X-ray and optical observations of the BL Lac object 1ES 1959+650 in high state

Details Wide band X-ray and optical observations of the BL Lac object 1ES 1959+650 in high state Wide band X-ray and optical observations of the BL Lac object 1ES 1959+650 in high state

2003-09-22

arxiv.org/abs/astro-ph/0309568v1

Astron.Astrophys.412:711-720,2003

Astronomy and Astrophysics

Astrophysics

12 pages, 6 figures, accepted by A&A

Scientific paper

10.1051/0004-6361:20034051

The blazar 1ES 1959+650 was observed twice by BeppoSAX in September 2001 simultaneously with optical observations. We report here the X-ray data together with the optical, R_C magnitude, light curve since August 1995. The BeppoSAX observations were triggered by an active X-ray status of the source. The X-ray spectra are brighter than the previously published X-ray observations, although the source was in an even higher state a few months later, as monitored by the ASM onboard RossiXTE, when it was also detected to flare in the TeV band. Our X-ray spectra are well represented by a continuosly curved model up to 45 keV and are interpreted as synchrotron emission, with the peak moving to higher energies. This is also confirmed by the slope of the X-ray spectrum which is harder than in previous observations. Based on our optical and X-ray data, the synchrotron peak turns out to be in the range 0.1-0.7 keV. We compare our data with non simultaneous radio to TeV data and model the spectral energy distribution with a homogeneous, one-zone synchrotron inverse Compton model. We derive physical parameters that are typical of low power High Energy peaked Blazar, characterised by a relatively large beaming factor, low luminosity and absence of external seed photons.

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