[RickS (Rick)]

Originally Posted by Ryderscope

Looks great on my 21" monitor. The Ha regions certainly pop out. I particularly like the interesting 'hollow looking round bits' (technical term) at upper right hand side of the galaxy.
R

Thanks, Rodney. There are some nice looking Ha bubbles. I saw similar structures in the SMC, usually with a star cluster and strong Oiii emission in the centre. I should see if I can convince my colleagues to do some long Oiii subs on M33.

Originally Posted by strongmanmike

Wow, looki that, what a galaxy. Great hybrid image.

Love the highlighting of the HII regions too, there are so many, very dramatic presentation, feels like I am looking down on Dresden in WWII or something.

Nice work amigo

Mike

Thanks, Mikey! I thought you'd like the magenta and I was going for a dramatic look. M33 looks so messy I had to try something

Originally Posted by Slawomir

Wonderful image Rick, I looked very carefully I could not see anything wrong with it, wait a second....maybe just those few green stars in the middle?

But really, colours look "natural" and echoing others - Ha regions look great and are a highlight for me in this image

Thanks, Suavi! I did notice the greenish stars but they are actually yellow and blue according to CIE L*c*h I'm sure the image can be improved and when I figure out how to do it I will deal with those miscreant stars.

Originally Posted by ozstronomer

Beautiful image Rick, Looks good to me

The Ha adds that little extra.

Agree with Placidus, the Ha rings are an interesting element. Do you know, are the rings some sort of Shock wave?

Cheers Geoff

Thanks, Geoff. Some of the Hii regions are similar to the ones in our own galaxy (e.g. the Orion Nebula) and appear to be created by a cluster of stars. The most obvious one in M33 is more than 40 times bigger than M42 and 3600 times more luminous:
https://en.wikipedia.org/wiki/NGC_604

Cheers,
Rick.