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Cipher, A Polarimeter Telescope Concept for Hard X-Ray Astronomy
Stephen, J. B.; Caroli, E.; Curado da Silva, R. M. +1 more
The polarisation of astrophysical source emission in the energy range from a few tens of keV up to the MeV region is an almost unexplored field of high-energy astrophysics. Till date, polarimetry in astrophysics in the energy domain from hard X-rays up to soft γ-rays has not been pursued due to the difficulties involved in obtaining sufficient sen…
In-Orbit Vignetting Calibrations of XMM-Newton Telescopes
Finoguenov, A.; Gondoin, P.; Aschenbach, B. +4 more
We describe measurements of the mirror vignetting in the XMM-Newton Observatory made in-orbit, using observations of SNR G21.5-09 and SNR 3C58 with the EPIC imaging cameras. The instrument features that complicate these measurements are briefly described. We show the spatial and energy dependences of measured vignetting, outlining assumptions made…