Quote:
Originally Posted by Peter Ward
A really interesting image.
The h-alpha glow is without doubt within the Milky Way (there are professional surveys that show this)
Still not convinced?
Think about the brightness of the diffuse h-alpha flux assuming it was emitted at the distance of Cent-A (~13 Million light years).....
well..."brightness" is perhaps the wrong term....it should be incredibly dim.
Occam's razor 
...but if not, then write up the paper and I'd expect you'll be in Stockholm soon enough .
Physics aside, a *really* interesting image and brings something new to the table
Really well done  |
Many thanks Peter! I agree Milky Way gas is most likely, and needs to be excluded before we accept it being part of CenA. The M82 Ha cloud I mentioned earlier was determined to most likely be associated with M82 rather than the Milky Way based on the information from the spectroscopy etc. The image of the M82 Ha cloud was taken with a pathfinder instrument for the Dragonfly array, which uses 3 x Canon 400mm f2/8 lens so very similar to me. For their image they detected the M82 Ha cloud on 2 images -one with a single lens integration of 95 hours and the other image with a single lens integration of 25 hours. M82 and CenA are both 12 million light years way from us, so it is at least possible that I have picked up some Ha associated with CenA with my 51.5 hours of Ha. All I need is 4-5 hours of time on a 8-10m scope and I'll let know for sure 😂