Broad-Band Soft X-ray Polarimetry

Details Broad-Band Soft X-ray Polarimetry Broad-Band Soft X-ray Polarimetry

2009-08-05

arxiv.org/abs/0908.0677v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

6 pages, 3 figures (2 color); to appear in proceedings of "The Coming of Age of X-ray Polarimetry"

Scientific paper

We developed an instrument design capable of measuring linear X-ray polarization over a broad-band using conventional spectroscopic optics. A set of multilayer-coated flats reflects the dispersed X-rays to the instrument detectors. The intensity variation with position angle is measured to determine three Stokes parameters: I, Q, and U -- all as a function of energy. By laterally grading the multilayer optics and matching the dispersion of the gratings, one may take advantage of high multilayer reflectivities and achieve modulation factors > 50% over the entire 0.2 to 0.8 keV band. This instrument could be used in a small orbiting mission or scaled up for the International X-ray Observatory. Laboratory work has begun that would demonstrate the capabilities of key components.

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