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xscat: dust scattering

This model calculates the X-ray scattering cross section of a population of dust grains as a function of energy, given a specific dust grain position and an extraction region. As the grain position gets closer to the source of the X-rays for a constant extraction region, the cross section drops as more X-rays remain within the extraction circle. For constant dust grain position, the cross section decreases with increasing extraction region size because more photons remain within it.

A detailed description of the model can be found in Smith, Valencic & Corrales (2016).

The model parameters are as follows.
par1 = $NH$ interstellar hydrogen column density ($10^{22}$ cm$^{-2}$).
par2 = $Xpos$ the relative position of the dust along the line of sight. This varies between 0 for dust at the observer and 1 for dust at the source.
par3 = $Rext$ the radius of the circular extraction region (arcsec).
par4 = $DustModel$ the dust model used (see Smith et al. 2016).

The third and fourth parameters must be frozen.


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