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A view of PKS 2155-304 with XMM-Newton Reflection Grating Spectrometers
I. Cagnoni, F. Nicastro, L. Maraschi +2
We present the high resolution X-ray spectrum of the BL Lac object PKS 2155-304 taken with the RGS units onboard XMM-Newton in November 2000. We detect a OVII Kalpha resonant absor…
Wide band X-ray and optical observations of the BL Lac object 1ES 1959+650 in high state
G. Tagliaferri, M. Ravasio, G. Ghisellini +5
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 magn…
The last Gift of BeppoSAX: PDS Observations of the two Blazars 1ES 0507-040 and PKS 1229-021
L. Chiappetti, G. Ghisellini, L. Maraschi +4
Towards the end of the BeppoSAX mission, the only operated Narrow Field Instrument was the PDS, which covers the energy range 13-300 keV. Two blazars, 1ES 0507-040 (z=0.304) and PK…
BeppoSAX and multiwavelength observations of BL Lacertae in 2000
M. Ravasio, G. Tagliaferri, G. Ghisellini +3
We present two BeppoSAX observations of BL Lac (2200+420) as part of a multiwavelength campaign performed in 2000. The source was in different states of activity: in June, the X-ra…
Arp 299: a second merging system with two active nuclei?
L. Ballo, V. Braito, R. Della Ceca +3
Recent BeppoSAX observations of Arp 299, a powerful far-IR merging starburst system composed of IC 694 and NGC 3690, clearly unveiled for the first time in this system the presence…
Reconsidering the origin of the X-ray emission lines in GRB 011211
Fabrizio Tavecchio, Gabriele Ghisellini, Davide Lazzati
We reanalyze the XMM--Newton data of GRB 011211 showing that the spectral features, interpreted by Reeves et al. (2002, 2003) as due thermal emission from a collisionally ionized p…
Chandra Observations of Nuclear X-ray Emission from a Sample of Radio Sources
J. K. Gambill, R. M. Sambruna, G. Chartas +5
We present the X-ray properties of a sample of 17 radio sources observed with the Chandra X-ray Observatory as part of a project aimed at studying the X-ray emission from their rad…
The BL Lac objects OQ 530 and S5 0716+714. Simultaneous observations in the X-rays, radio, optical and TeV bands
G. Tagliaferri, M. Ravasio, G. Ghisellini +10
We present the results of the BeppoSAX observations of two BL Lacs, OQ 530 and S5 0716+714, as part of a ToO program for the simultaneous observation at radio, optical, X-ray and T…