HEASoft and XSPEC are now available as conda packages. See details ....
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 = |
interstellar hydrogen column density ( |
par2 = |
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 = |
the radius of the circular extraction region (arcsec). |
par4 = |
the dust model used (see Smith et al. 2016). The model options are 1=MRN, 2=WD, and 3=ZDABAS. |
The third and fourth parameters must be frozen.