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Multifrequency Observations of the Gamma-Ray Blazar 3C 279 in Low-State during Integral AO-1
W. Collmar, M. Böttcher, V. Burwitz +19
We report first results of a multifrequency campaign from radio to hard X-ray energies of the prominent gamma-ray blazar 3C 279 during the first year of the INTEGRAL mission. The v…
Improving XMM-Newton EPIC pn data at low energies: method and application to the Vela SNR
Konrad Dennerl, Bernd Aschenbach, Ulrich G. Briel +13
High quantum efficiency over a broad spectral range is one of the main properties of the EPIC pn camera on-board XMM-Newton. The quantum efficiency rises from ~75% at 0.2 keV to ~1…
Chandra Observations of the NLS1 RX J2217.9-5941
D. Grupe, K. M. Leighly, V. Burwitz +2
We report the results of two Chandra ACIS-S observations from February and August 2003 of the highly X-ray variable Narrow-Line Seyfert 1 galaxy RX J2217.9--5941. Observations span…
On the Nature of the Binary Components of RX J0806.3+1527
K. Reinsch, V. Burwitz, R. Schwarz
We present imaging circular polarimetry and near-infrared photometry of the suspected ultra-short period white-dwarf binary RX J0806.3+1527 obtained with the ESO VLT and discuss th…