The Stellar X-ray Polarimeter - A focal plane polarimeter for the Spectrum X-Gamma mission

Details The Stellar X-ray Polarimeter - A focal plane polarimeter for the Spectrum X-Gamma mission The Stellar X-ray Polarimeter - A focal plane polarimeter for the Spectrum X-Gamma mission

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990opten..29..773k&link_type=abstract

Optical Engineering (ISSN 0091-3286), vol. 29, July 1990, p. 773-780.

Astronomy and Astrophysics

Astronomy

7

Focal Plane Devices, Polarimeters, Space Missions, Stellar Radiation, X Ray Astronomy, Black Holes (Astronomy), Bragg Angle, Cygnus Constellation, Galactic Nuclei, Photocathodes, Polarization (Waves), Pulsars, Supernova Remnants, Thomson Scattering, X Ray Binaries, X Ray Sources

Scientific paper

This paper describes an X-ray polarimeter that will be flown on the Spectrum X-Gamma mission. The instrument exploits three distinct physical processes to measure polarization: Bragg reflection from a graphite crystal, Thomson scattering from a metallic lithium target, and photoemission from a cesium iodide photocathode. These three methods allow polarization measurements over an energy band from 0.3 to 12 keV. The polarimeter will make possible sensitive measurements of several hundred known X-ray sources. X-ray polarization measurements will make it possible to constrain the geometry of gas flow in X-ray binaries, identify nonthermal emission in supernova remnants, test current models for X-ray emission in radio pulsars, determine the radiation mechanisms in active galactic nuclei, and search for inertial frame dragging (Lense-Thirring effect) around the putative black hole in Cygnus X-1.

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