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The X-Ray Spectrum in BL Lacertae Object PKS 2155-304

CHEN Jun-feng;YOU Jun-han(1.Department of Physics,Shanghai Jiao-tong University)(2.Center for Astrophysics,University of Science and Technology of China)  
The simultaneous multi-wavelength measurements for BL Lacertae object PKS 2155-304 indicate that the X-ray spectrum between ̄lkeV and 10 keV can be described as an approximate power law plus absorption at 6-7keV and the measured variability time scale is tD≤2000 seconds,which means that X-ray is probably produced nearby the central black hole(inner part of emission region) and is observed after it passing through a "cold" gas around.In this paper,it is assumed that X-ray which is produced nearby the central region is bound to be comptonized when passing through the "cold" plasma around.Therefore,the shape of original spectrumis changed.Using this model,the X-ray spectrum can be well fitted.
【CateGory Index】: P141.5
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