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How do I analyse a PACS point source spectrum if my source is in the central 3x3 spaxels, but not in the central spaxel?
Posted by Mark Kidger, Last modified by Mark Kidger on 14 September 2018 09:01 AM

Assuming that you have watched the Herschel Science Centre short videotutorial called Starting with PACS Spectroscopy:

https://www.youtube.com/watch?v=rcY487Z9Kyg 

And the Herschel Science Centre short videotutorial Point Source Spectroscopy with PACS:

https://www.youtube.com/watch?v=nYWTccEQz_M

Or, at least, are familiar with the contents of both short videotutorials and their associated documentation, you will find that the Herschel Science Centre short videotutorial on Point source spectroscopy with PACS: point sources in the central 3x3 spaxels, which you can find here:

https://www.youtube.com/watch?v=v1W5pT9DYUk

will show you how to proceed if your point source is in the central 3x3 spaxels, but not in the central spaxel itself. This case is valid if you have a point source, with a pointed observation, in which the target is centred within one of the eight spaxels surrounding the central spaxel, or for a mapping observation, in which, for one of the raster positions, the point source is centred within one of the eight spaxels surrounding the central spaxel. You will learn to identify cases for which the process may not work well (contamination, poorly centred point sources, ...) You will learn how to identify the spaxel coordinates of a source and which HIPE scripts and tasks to apply in the different possible cases. It will also show you a "last resort" case that you can use if your source is not even centred in the central 3x3 spaxels. You will also be guided towards the other processing and post-processing that may be helpful, such as the Pointing Offset Correction pipeline, or the Extended-to-point Correction.

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