positions and uncertainties for point sources

From: Adrienne Cool (cool@quark.sfsu.edu)
Date: Tue Jul 31 2001 - 13:47:39 EDT


Hello,

Does anyone know if there is a way to give ciao an approximate
(eyeball) position of a point source (e.g. in an ACIS-I image),
and have it determine its best position and provide an
uncertainty on it?

A couple of related questions:

1. Is anyone aware of documentation explaining how celldetect
    or wavdetect) make their final determination of positions?
    Some of the positions I get look pretty bad. Is there
    any way to adjust the parameters they use to make these
    determinations (e.g. a radius within which pixels are
    included in the final source position determination)?
 
2. Is there any way to avoid having positions reported as
    ellipses, and just get (e.g.) 90% confidence radii on
    positions?

Thanks in advance for any input...

Adrienne



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