by Ann » Sun Oct 09, 2011 5:23 pm
Leonardo Orazi, I want to thank you, belatedly, for your very fine picture of NGC 205, one of the satellite galaxies of the Andromeda Galaxy. Note the tidal tail of stars stretching away to the upper right in this picture, probably in the direction of mighty Andromeda!
But note, too, the interesting characteristics of NGC 205. Far from being a featureless boring yellow blob, NGC 205 sports dust clouds close to its central region. And inside the dust, closer to the center, the stellar population is bluer than elsewhere! We are clearly talking A- and F-stars here, whereas the rest of the galaxy is dominated by K- and M-type stars. Obviously NGC 205 underwent a smallish burst of central star formation a few hundred million years ago. Thanks for making that clear in your very fine image, Leonardo!
Ann
Leonardo Orazi, I want to thank you, belatedly, for your very fine picture of NGC 205, one of the satellite galaxies of the Andromeda Galaxy. Note the tidal tail of stars stretching away to the upper right in this picture, probably in the direction of mighty Andromeda!
But note, too, the interesting characteristics of NGC 205. Far from being a featureless boring yellow blob, NGC 205 sports dust clouds close to its central region. And inside the dust, closer to the center, the stellar population is bluer than elsewhere! We are clearly talking A- and F-stars here, whereas the rest of the galaxy is dominated by K- and M-type stars. Obviously NGC 205 underwent a smallish burst of central star formation a few hundred million years ago. Thanks for making that clear in your very fine image, Leonardo! :D
Ann