A proposed NASA SmallSat could measure soft X-ray polarization across 0.2-0.4 keV with enough sensitivity to test neutron star and black hole physics.
Astro2020 Science White Paper: Using X-Ray Polarimetry to Probe the Physics of Black Holes and Neutron Stars
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abstract
This white paper highlights compact object and fundamental physics science opportunities afforded by high-throughput broadband (0.1-60 keV) X-ray polarization observations. X-ray polarimetry gives new observables with geometric information about stellar remnants which are many orders of magnitude too small for direct imaging. The X-ray polarimetric data also reveal details about the emission mechanisms and the structure of the magnetic fields in and around the most extreme objects in the Universe. Whereas the Imaging X-ray Polarimetry Explorer (IXPE) to be launched in 2021 will obtain first results for bright objects, a follow-up mission could be one order of magnitude more sensitive and would be able to use a broader bandpass to perform physics type experiments for representative samples of sources.
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A new NASA Pioneer: the Globe Orbiting Soft X-ray Polarimeter (GOSoX)
A proposed NASA SmallSat could measure soft X-ray polarization across 0.2-0.4 keV with enough sensitivity to test neutron star and black hole physics.