pileup

CCD pile-up model used for brightish point sources observed by Chandra. This is an implementation of the fast pile-up algorithm proposed by John Davis (see http://space.mit.edu/davis/papers/pileup2001.pdf). The frame time and maximum number of photons to pile up should be fixed. The grade morphing is expressed through a single parameter, alpha, which should be left as a free parameter. Note that to calculate fluxes etc. for the model you must remove the pileup component.

par1 |
= | frame time (in seconds) | |||

par2 |
= | maximum number of photons to pile up | |||

par3 |
= | grade correction for single photon detection | |||

par4 |
= | grade morphing parameter (good grade fraction is assumed
proportional to par4^{(p-1)} where p is the number of piled
photons) |
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par5 |
= | PSF fraction. Only this fraction will be treated for pile-up | |||

par6 |
= | Number of regions. The counts to be piled-up will be distributed among par6 regions, which will be piled-up independently. |