While processing early data I noticed some nice structure in OIII in NGC4559. That led me to dig into various catalogs to see what was listed. After not finding anything and doing comparisons to other deep sky survey images, it triggered me to go much deeper on OIII to ensure it was true signal and not noise. I ended up getting the help of a couple of collaborators to get some extra OIII data as well. There is in fact a lot of non-cataloged structure in both Ha and OIII in this galaxy. It is just not a well studied galaxy. It may not be as spectacular as the OIII arc over Andromeda but I am very excited to share new structures not in the scientific literature with the community!!
There is a gorgeous cluster of galaxies off to the lower left of the Koi Fish including PGC1811760 that showed a ton of OIII during the continuum subtraction process.
The final image is a blend of mine and my collaborators final images. I want to thank Carl and Sean for their telescope time and involvement with my interest in this object!
Link to my video I made on this object:
https://youtu.be/1RcFDrRBGX0Links to Carl and Sean:
https://applewood-astro.com/https://www.astrobin.com/users/SM90/Here is the side by side comparison of OIII to various sky survey images (I rotated and zoomed in on my OIII to roughly a similar scale)
Another uncatalogued OIII structure
Narrowband data
Cropped view of the Koi Fish Galaxy
Intriguing Cluster of Galaxies and PGC1811760 showed a lot of OIII during the continuum subtraction process
All gas structures annotated along with various quasars and galaxies
All the Galaxies annotated:
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