Physics – Optics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2816m&link_type=abstract
American Astronomical Society, HEAD meeting #10, #28.16
Physics
Optics
Scientific paper
Polarization measurements above 10 keV energy range can provide crucial information about astrophysical objects. Strong X-ray and gamma-ray polarization can arise from synchrotron emission in an ordered magnetic field around isolated pulsars and jet-dominated active galaxies, photon propagation through extremely strong magnetic field in accreting neutron stars and anisotropic Compton scattering by accretion disks around black holes. Therefore, despite difficulties of the polarization measurement, several polarimetry missions have been proposed and are being developed (e.g., PoGOLite, PHENEX, GRAPE, CIPHER and POLAR). Most of these missions adopt a collimator-type instrument and their sensitivity of polarization measurement is limited to 0.1-1 Crab level with an exposure within one day, which is typical to high-energy astrophysics observations. A hard X-ray mirror is expected to improve the sensitivity by more than an order of magnitude and provide a breakthrough in X-ray and gamma-ray polarimetry. Systematic errors in polarization measurement, either an artificial polarization or a loss of polarization introduced through condensing X-ray photons, should be evaluated experimentally. We have carried out an experiment to measure the polarization angle dependence of the reflectivity of multi-layer hard X-ray mirror at 30 keV at medium-length beamline 20B2 in SPring-8 (Hyogo, Japan) in last December, and confirmed that the dependence is less than ± 1%. This ensures that we are able to measure weak polarization down to at least a few % using hard X-ray optics. We will present the test results and discuss the performance of future polarimetry missions.
Hayashida Kiyoshi
Iwahara Tomonaga
Kamae Teturo
Kano Yosuke
Katsuta Jun'ichiro
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