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PaulHancock / Aegean

The Aegean source finding program and associated tools
http://aegeantools.rtfd.io/
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AeRes masking (--mask) adds components to the image as well as masking areas. #134

Closed todoherty closed 4 years ago

todoherty commented 4 years ago

When using the --mask option of AeRes to mask sources from the input catalogue the image is altered aside from the masking. In the attached image, which displays the model.fits file created by AeRes, multiple ellipses can be seen. These are the sources modeled by AeRes, and the pink region is the location of the nans (which are what is masked). However, we can see that around the nans is non-zero, and these non-zero components are added to the image. This can cause issues when source finding as it can boost the signal to noise around the masked areas above the detection threshold. aeres_error

PaulHancock commented 4 years ago

This is a good demonstration of the issue that I was trying to describe in #131. I have since fixed this bug!