HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.

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Comptonization of a seed spectrum

NOTE: This model is now in the Xspec release and this page is superceded by the Xspec manual

An empirical convolution model of Comptonization in which a fraction of the photons in an input seed spectrum is scattered into a power-law component. The model is described in Steiner et al. (2008, in prep), with details related to the XSPEC implementation given in the appendix. It is designed for soft plasmas which are not Compton thick, and Gamma>1. When using this model, it may be necessary to extend the energy grid over which the model is calculated. This can be accomplished using the energies command.

par1 = Gamma, the photon power-law index.
par2 = the scattered fraction. This should be bounded between 0 and 1.
par3 = a flag to switch between up-scattering only (>0) and both up- and down-scattering (<=0).

The source code file required is simpl.f with the parameter information in simpl_lmodel.dat.

Keith Arnaud, Lab. for High Energy Astrophysics, NASA/Goddard Space Flight Center

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Last modified: Tuesday, 14-Feb-2023 16:42:01 EST

HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.