That's some extreme imaging Mike, I like it! Well done and thanks for sharing.
I notice you've also got the distant double spiral twins visible under M104, directly behind the "21" in your labelled image. I'm not sure how distant they are, haven't been able to find any literature about them but I always check for them in M104 images. Here they are in a HST shot: http://antwrp.gsfc.nasa.gov/apod/fap...ro_hst_big.jpg (close to the bottom, 1/3 of the way from the left).
yikes.. just another 'amateur' image eh.. congrats on putting the hard work in to identify all those suckers and demonstrate what an amazing image it is!
Fantastic effort Mike. Thanks for taking the time to identify them and for sharing your results. Demonstrates again the immense power of amateur astrophotography with quality equipment to go real deep.
As a measure of how far technology has come I doubt that 20 years ago the Mt Palomar 200" using the best hypered film technology could go much deeper than you've done.
I wonder what the night sky would look like from inside M104 with that very dusty plane, large central bulge and thousands of globulars dotted about? Aaaaaaaah!
