by Ann » Sun Oct 13, 2013 2:51 pm
Just like Stephen Lehsin, Adam Block has a new image of
NGC 520.
It is interesting to compare the two images. NGC 520 is a galactic train wreck, the result of a tremendous collision of two galaxies, where the debris is actually cooling somewhat. That's why we don't see that many young stars in NGC 520. Alternatively, the galaxies that collided didn't contain a lot of "fuel" - that is, they might have been gas-poor. The upper arm, the one that is curved, is bluer in color than the rest of the galaxy, and it also contains many young clusters. The rest of the galaxy seems to lack clusters altogether. The smooth non-yellow populations in this galaxy are certainly made up of intermediate stars, where most of the light comes from A-, F- and G-type stars. The brightest fireworks, the O- and B-stars, have already sparkled and died.
In any case, both Adam Block's and Stephen Lehsin's images are very beautiful, interesting and informative.
Ann
Just like Stephen Lehsin, Adam Block has a new image of [url=http://www.caelumobservatory.com/mlsc/n520.jpg]NGC 520[/url].
It is interesting to compare the two images. NGC 520 is a galactic train wreck, the result of a tremendous collision of two galaxies, where the debris is actually cooling somewhat. That's why we don't see that many young stars in NGC 520. Alternatively, the galaxies that collided didn't contain a lot of "fuel" - that is, they might have been gas-poor. The upper arm, the one that is curved, is bluer in color than the rest of the galaxy, and it also contains many young clusters. The rest of the galaxy seems to lack clusters altogether. The smooth non-yellow populations in this galaxy are certainly made up of intermediate stars, where most of the light comes from A-, F- and G-type stars. The brightest fireworks, the O- and B-stars, have already sparkled and died.
In any case, both Adam Block's and Stephen Lehsin's images are very beautiful, interesting and informative.
Ann