The situation is a little more favorable in that I have both a 0.4s frame-
time and 3.2s frame-time data set. The short frame-time dataset is nearly
unaffected by pile-up but is only 1/4 as long. Right now I'm exploring
things with the 0.4s frame-time data set before trying to deal with pile-up.
Honestly, I don't know if these sources are point sources, that's part of
what I'm hoping to find out! At least one of them should be, but some likely
are not. I've already created pha spectra for each of them using the 0.4s
frame-time dataset, but I wouldn't mind getting better constraints if I could
use the longer, 3.2s frame-time dataset.
On Mon, 19 Nov 2001, John E. Davis wrote:
> Eric Perlman <email@example.com> wrote:
> >I'm a bit lost here: how do you propose I modify my PSF file for pile-up?
> >Also it seems to me that doing things this way would force one into assuming
> >that all sources have exactly the same fraction of piled-up pohtons. This
> >isn't the case in my data: there are four sources affected by pile-up, with
> >fluxes (and presumably piled-up fractions) that vary by about a factor 4.
> Are these point sources? If so, why not create a pha spectrum for
> each of the point sources and analyse the result using the pileup
> model in recent versions of isis, sherpa, or xspec?
-- Eric S. Perlman E-mail: firstname.lastname@example.org Joint Ctr. for Astrophysics, Physics Dept. Phone: +1 410 455 1982 University of Maryland, Baltimore County Fax: +1 410 455 1072 1000 Hilltop Circle WWW: www.jca.umbc.edu/~perlman Baltimore, MD 21250
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