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A magnificent image and great contribution. Well done.
I would conjecture the Ha is in the Milky Way as average galaxy images don't show surrounding Ha clouds and the distances involved would be mind boggling. The clouds would be many hundreds of times larger than Cent A itself. Whilst possible it just doesn't seem likely.
The Milky Way on the other hand is chock full of Ha clouds as a wide angle shot reveals.
Also Ha surrounding a distant galaxy, where would the ionizing radiation come from?
Love that technique. Just when you think you have seen it all in this game someone posts an image like yours!
Greg.
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