[alpal]

Originally Posted by matlud

Thanks Marc!

As Allan has mentioned RBA published his fantastic image of the Ha clouds around M31,
and Vicet Peris from Pixinsight also did a great monochrome M31 recently 👍

Hi Mathew,
as the article says -
https://www.deepskycolors.com/archiv...Andromeda.html

Along with all the bright emission and reflection nebula we usually see in photographs, our night sky is filled with a much fainter type of clouds that goes by different names: High Galactic Cirrus, Integrated Flux Nebula (IFN), Translucent Clouds, High Latitude Clouds and so on... (Low et al., 1984)
IFN is usually visible in infrared, and can also be - barely - captured under dark skies in "visible light" because it's mostly dust (not gas) that manages to reflect the light of our own galaxy as a whole. It, however, can also emit some light in the Extended Red Emission or ERE (Witt et al. 2008), a wide spectral range that covers all red visible light all the way to the near infrared. This is one reason IFN usually appears brownish in color when captured with broadband filters: it's a mix of reflected blue light and some emitted ERE (red) light.

It's fairly certain that you have picked up emissions from the Milky Way.

cheers
Allan