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moustakas / SGA

Code and papers for the Siena Galaxy Atlas (SGA-2020).
MIT License
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Weird short bright strip #58

Closed siyue closed 1 year ago

siyue commented 2 years ago

A few galaxies (I have checked 400+ galaxies) have a weird bright strip across the galaxy. For example, check the center of https://portal.nersc.gov/project/cosmo/data/sga/2020/data/334/ESO108-023/ESO108-023-largegalaxy-image-grz.jpg. May I ask are they cosmic ray? It there any way to remove them?

dstndstn commented 2 years ago

If you mean that bright green line, yes, that's a cosmic ray. In the centers of galaxies where there is a lot of background light, it is harder to detect and mask cosmic rays.

siyue commented 2 years ago

Thanks!

moustakas commented 1 year ago

Here's the direct link for ESO108-023 https://www.legacysurvey.org/viewer?ra=334.1342&dec=-64.3893&layer=ls-dr9&zoom=14&sga

Unfortunately, this is more of a CP-reduction issue than an SGA issue, so I'm closing.

dstndstn commented 1 year ago

We could in principle try to tune the outlier-detection code to catch these cases where cosmics are harder to catch on top of big galaxies.