Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345718b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #457.18; Bulletin of the American Astronomical Society, Vol. 41, p.361
Astronomy and Astrophysics
Astrophysics
Scientific paper
Astrophysical X-ray polarimetry remains as unexplored now as it was 30 years ago. Narrow bandwidth or low scattering efficiency in current technologies have rendered polarisation observations insensitive to all but the brightest sources. Consequently only one unambiguous measurement of polarisation in a cosmic X-ray source has been made to date: that of 19% linear polarisation at 2.6 keV for the Crab nebula. The very large effective area of the International X-ray Observatory compared to that of previous observatories opens the possibility of the first new results in astronomical X-ray polarimetry for over three decades. We describe a simple, low-mass X-ray filter technology which can add polarimetry capability to the existing Narrow Field Imager. We summarise results from our current laboratory proof-of-concept studies, provide estimates of the minimum detectable polarisation for a selection of sources and discuss the astrophysical observations that could be made by IXO using this device.
Bannister Nigel
Fraser Geoff
Martindale A.
Willingale Richard
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