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Add Chandra source finding - a stopgap until that part of the overall ecosystem is built #318

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DavidT3 opened this issue Oct 17, 2024 · 3 comments
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@DavidT3
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DavidT3 commented Oct 17, 2024

Megan rates the Voronoi tessellation source finder, so will probably use that. Ultimately I want DAXA to be able to run source detection for all the telescopes, but the actual source detection would ideally live in another module which can also (to some degree) make fake observations in order to be able to easily build selection functions.

@DavidT3 DavidT3 self-assigned this Oct 17, 2024
@DavidT3 DavidT3 converted this from a draft issue Oct 17, 2024
@DavidT3 DavidT3 added the enhancement New feature or request label Oct 17, 2024
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DavidT3 commented Oct 25, 2024

First, must decide which techniques to focus on - could well end up implementing all three(?) that they offer in CIAO for now. Whatever we do though will likely not be forever, as eventually another package will be created dedicated to source finding and selection function generation.

I've heard good things about the Voronoi tessellation CIAO tool, and it is fairly computationally efficient, so might well do that one.

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DavidT3 commented Oct 25, 2024

Had a go with the voronoi tessellation - on ObsID 3185 (of my favourite A907). Ran pretty fast, though it crashed the first time I ran it because of a stack size limit on the shell I think? (ran ulimit and it worked the second time).

Does a decent job - certainly detects A907 and many of the outlying point sources:

ds9

However it also gets a tonne of spurious sources around the edge of the A907 detection - and misses a couple of point sources that I know are within the A907 extended emission (both from my knowledge of this cluster, and you can see them).

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DavidT3 commented Oct 25, 2024

Possibly could fiddle with the settings to improve it, but maybe this isn't the best method for wide application? I wish XAPA were generalised, but that won't be ready for an age.

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