Wednesday, July 28, 2010
It is easy to misinterpret the "PSF fraction" parameter in the pileup model. A natural reading is to suppose that this means the fraction of the PSF which is included in the source extraction region. This is not correct. For the pileup model to work well the extraction region should be large enough to include essentially all the PSF. The "PSF fraction" parameter is actually the fraction of counts detected which should not be included in the pileup calculation. The manual will be modified to make this clearer. My thanks to Pat Broos for pointing out this potential confusion.
Tuesday, July 27, 2010
Monday, July 12, 2010
Thursday, July 08, 2010
I have added two new local model pages to the collection. Maurice Leutenegger has supplied his models for hot star winds and David Ballantyne has provided table model files for the reflection of a blackbody from a constant density ionized accretion disk.