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The downward X-ray spectrum of PKS 2155-304 in the inner jet description

Ciprini, Stefano

The compact radio source PKS 2155-304 ( z=0.116) is a gamma-ray blazar and one of the brightest in UV and X-ray bands, repeatedly monitored at X-ray frequencies in the past years, and observed recently by Chandra and XMM-Newton. Various intensity states and a continuously downward-curved trend with the energy is displayed clearly, summarizing some…

XMM-Newton observations of absorption features towards PKS 2155-304

Maraschi, L.; Tavecchio, F.; Treves, A. +2 more

We present XMM-Newton grating spectra of the bright BL Lac object PKS 2155-304 taken in November 2000. Various absorption features are detected in the range 5-38 Å. The results are compared with those recently obtained with Chandra gratings [ApJ 573 (2002) 157; Nature, 421 (2003) 719]. We discuss whether the absorption occurs at the source (in the…

Temporal variability of Mrk 421 from XMM-Newton observations

Haberl, F.; Papadakis, I.; Brinkmann, W. +1 more

Mrk 421 has been observed several times as a calibration target for the instruments on board XMM-Newton. We have studied in some detail the temporal and spectral variability of the source during eight pointings, mainly from the PN camera, which provides the by far highest S/N data available for that source.