Science Investigations with a Grating Spectrometer on the International X-ray Observatory

Details Science Investigations with a Grating Spectrometer on the International X-ray Observatory Science Investigations with a Grating Spectrometer on the International X-ray Observatory

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345419m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #454.19; Bulletin of the American Astronomical Society, Vol. 41, p.353

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present examples of scientific investigations that could be performed with a grating spectrometer on the International X-ray Observatory (IXO). The simulations are based on configurations using critical angle transmission (CAT) gratings, providing high spectral resolution and effective area. The simulations show that a CAT grating spectrometer can resolve most of the weakest lines in the X-ray spectra of active galaxies' warm absorbers and be used to determine which features match up with UV known absorption lines in order to improve models of this outflowing gas. Blends in the spectra of cool stars can be resolved, improving measurements of lines used as density and abundance diagnostics. Weak absorption features in the atmospheres of isolated neutron stars could be detected and measured as a function of rotation phase. With the substantial effective area of a CAT grating spectrometer on IXO, dozens of lines of sight toward high redshift quasars can be examined for evidence of ionized, intergalactic gas, probing the structure of the baryonic material in the Universe.
Support for this work was provided by the National Aeronautics and Space Administration through the Smithsonian Astrophysical Observatory contract SV3-73016 to MIT for Support of the Chandra X-Ray Center, which is operated by the SAO for and on behalf of NASA under contract NAS8-03060 and by NASA grants NNX07AG98G and NNX08AI62G.

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