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What MOPEX namelist should I use for crowded fields?
Posted by Vandana Desai on 25 March 2013 10:47 AM

We don't currently have any special Mopex/Apex namelists for crowded fields.  Many people have used the default namelists.  If using the GUI, see Cookbook Recipe 7, http://irsa.ipac.caltech.edu/data/SPITZER/docs/dataanalysistools/cookbook/7/. And the command-line namelists are identical.

There are 2 things to consider.  One is whether the Mosaic task has done a good job given the low coverage.  Check whether there are uncorrected radhits on the mosaic.  The module "box_outlier" is on by default and designed to work with coverage as low as 3.  If needed, it could be made more aggressive by lowering the "BOX*THRESHOLD" parameters in the MosaicRmask block.

Second is whether Detect is optimized for your mosaic.  The default namelists should be okay for the bulk of the field.  You might do a
second special run for a crowded area -- the main parameter in Detect is Detection_Threshold which you could raise for the crowded area.
You could also raise Min_Coverage if radhits are slipping in.

But there will always be some fields that are just too difficult for an automated program to do properly.

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