Computer Science – Performance
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3702h&link_type=abstract
American Astronomical Society, HEAD meeting #12, #37.02
Computer Science
Performance
Scientific paper
The Gravity and Extreme Magnetism Small explorer (GEMS) was selected by NASA for flight in 2014. GEMS will make the first sensitive search for X-ray polarization across a wide set of source classes including stellar black holes, Seyfert galaxies and quasars, blazars, rotation and accretion-powered pulsars, magnetars, shell supernova remnants and pulsar wind nebulae. We will discuss the design of GEMS and the planned science program. GEMS is implemented using Time Projection Chambers with high efficiency in the 2-10 keV band, behind foil mirrors adopted from those on Suzaku. Two telescopes will be deployed on an ATK extendable boom on an Orbital bus. Bus and instrument together rotate at 0.1 rpm, which allows separation of instrument- and source-generated signals. Rotation also allows a small Bragg reflection soft X-ray experiment to be included that can extend the sensitivity to 0.5 keV. A minimum program of 9 months will cover at least 23 targets to interesting levels of minimum detectable polarization. Nominal performance will find results for more targets. As many again targets would be suitable for an extended mission.
GEMS Team
Hebb Swank Jean
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