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H-alpha cloud / structure near Omega Centauri - Does a photo of this exists? Other · Mauricio Christiano de Souza · ... · 3 · 293 · 7

astromauchrisouza 5.27
Mauricio Christiano de Souza
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I started a project on Omega Centauri last year and took some Ha frames just to see if there some faint signal in the background from whatever could be there using Nicolas' Rokinon 135mm f/2, ASI294MM and Antlia 3nm Ha filter. It turns out that looks like there is something there, but I have never seen it in any photos. Maybe someone captured it before?

Original Image:
image.png

Starless continuum subtracted and gradient corrected image:
Imagem do WhatsApp de 2025-01-03 à(s) 15.30.09_b1caa2f5.jpg

Denoised crop (with dust spot):
Imagem do WhatsApp de 2025-01-03 à(s) 15.49.34_9fd0d2fb.jpg
Edited ...
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Alexn 12.25
Alex Nicholas
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I have seen faint edges of it in widefield exposures of Omega Centauri before, but not where someone threw 30~50hrs at it to make it prominent. 

a worthy project if ever I saw one!
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daniele.borsari 5.25
Daniele Borsari
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Interesting for sure and it indeed looks like it's real signal.

Can I ask you how you denoised that master? You took away all the noise, how do you do it?
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astromauchrisouza 5.27
Mauricio Christiano de Souza
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Daniele Borsari:
Interesting for sure and it indeed looks like it's real signal.

Can I ask you how you denoised that master? You took away all the noise, how do you do it?

This is the raw continuum subtracted Ha:
image.png

First I used NXT for high frequency noise:
image.png

Then I used MMT for low frequency noise with a stretched and convoluted inverted mask:
image.png

Lastly I went for another go with NXT:
image.png

Beware that you will loose some details with this workflow. I did it this way because the signal is way too low and I don't think it is worth trying to preserve any details.
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