Interesting L shape

https://www.legacysurvey.org//viewer/?ra=110.2022&dec=21.1548&layer=ls-dr9&zoom=16

Anyone know what this or what’s causing it? The shape can be seen in most surveys although not always appearing as an L.

Welcome :slight_smile: If you click on the map and follow the “single exposures” link, you’ll get
https://www.legacysurvey.org/viewer/exposures/?ra=110.2019&dec=21.1549&layer=ls-dr9
showing the different exposures that went into making the color image in this bit of the sky. Here, in the bottom exposure, you’ll see that this is part of a larger squiggle – a cosmic ray – and the bottom part of it was detected by the software and eliminated, but this L part was not, and so it shows up in the final result. Cosmic rays are pretty common – just north of your example there’s this one,
https://www.legacysurvey.org//viewer/?ra=110.2086&dec=21.1738&layer=ls-dr9&zoom=16
Cosmic rays are basically pesky particles that hit our CCD detectors and cause these squiggles.

cheers,
dustin

Interesting, I’m very new to this but fascinated by all of it. Thanks!

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