Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aiaa.conf.....a&link_type=abstract
Conference Paper, AIAA Paper 93-4288
Astronomy and Astrophysics
Astronomy
1
X Ray Sources, X Ray Astronomy, Polarized Electromagnetic Radiation, X Ray Imagery, Astronomical Polarimetry, Compton Effect
Scientific paper
The detection of polarized X-rays from cosmic X-ray sources will give useful information about the magnetic fields and matter surrounding these sources. Up to now only one experiment, OSO-8, has measured the degree of polarization from a cosmic X-ray source. In the past we demonstrated a novel new technique using an intensified camera coupled to a gas-filled proportional counter which can be used to measure X-ray polarization by imaging the tracks of photoelectrons ejected when X-rays are absorbed in the detector volume. These tracks contain information about the location of the X-ray interaction point and its polarization. In the lab we have obtained modulation factors of about 30 percent for 60 keV polarized X-rays. Here we discuss preliminary work done towards building a large-area hard X-ray imaging polarimeter which will be able to measure X-ray polarization from bright cosmic X-ray sources at energies between 40 keV and 100 keV.
Austin Robert A.
Minamitani Takahisa
Ramsey Brian D.
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