Statistics – Applications
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.1314j&link_type=abstract
American Astronomical Society, HEAD meeting #10, #13.14
Statistics
Applications
Scientific paper
By taking advantage of the atomic data and physics from the equilibrium photoionization model of XSTAR, we are extending our non-equilibrium collisional ionization code to photoionized plasmas. The expanded model will allow us to study processes in a wide range of astrophysical scenarios -- such as colliding winds in X-ray binaries, outflows in AGNs, and shock flows in the IGM, but presents significant challenges. Chief among these are that the new model is expensive to compute and difficult to compare directly with HETG observations. We discuss how parallelism and modular software techniques are being brought to bear on these problems, in the context of several applications: (1) emission measurement analysis for the accretion disk corona of HerX-1, using XSTAR within the Parallel Virtual Machine; (2) using ISIS for direct ionization analysis and line diagnostics of the plane shock model, via our dynamically loadable interface to selected routines from the XSPEC vpshock model; and (3) computing atomic rates directly in ISIS by way of our dynamically loadable XSTAR module.
Ji Liangliang
Marshall Herman L.
Noble Michael
Nowak Maciej A.
Schulz Norbert S.
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