by Ann » Thu Nov 19, 2015 1:56 am
starsurfer wrote:Ann wrote: Adam Block has posted two new galaxy images, NGC 6118 and NGC 918.
Full size images can be seen at
caelumobservatory.com.
Ann
I saw these a few days ago and they're amazing! Also congratulations on including images in a post!
However you haven't included my favourite, which is a new version of Arp 104, Keenan's System!
Here is Keenan's System.
The most remarkable aspect of this interacting pair is the "thread" connecting them. But to me, the most noteworthy thing is that the galaxy at top, NGC 5218, has recently (say, a billion years ago) undergone a tremendous burst of star formation that likely drove most of the starforming gas out of the galaxy. (Tidal forces caused by its interaction with elliptical NGC 5216 also helped driving out gas from NGC 5218.) Therefore NGC 5218 has a rich, brilliant, smoothly distributed population of stars of spectral class A (and possibly late B), a spectacular remnant of its past starburst, but hardly any O-stars any more. NGC 5218 is likely in transition into into a "red and dead", elliptical galaxy.
Full resolution of the image can be seen
here.
Ann
[quote="starsurfer"][quote="Ann"][img]http://www.caelumobservatory.com/mlsc/n6118thumb.jpg[/img] [img]http://www.caelumobservatory.com/mlsc/n918thumb.jpg[/img] Adam Block has posted two new galaxy images, NGC 6118 and NGC 918.
Full size images can be seen at [url=http://www.caelumobservatory.com/gallery/galaxies.shtml]caelumobservatory.com[/url].
Ann[/quote]
I saw these a few days ago and they're amazing! Also congratulations on including images in a post!
However you haven't included my favourite, which is a new version of Arp 104, Keenan's System![/quote]
[img]http://www.caelumobservatory.com/mlsc/n5216thumb.jpg[/img] Here is Keenan's System.
The most remarkable aspect of this interacting pair is the "thread" connecting them. But to me, the most noteworthy thing is that the galaxy at top, NGC 5218, has recently (say, a billion years ago) undergone a tremendous burst of star formation that likely drove most of the starforming gas out of the galaxy. (Tidal forces caused by its interaction with elliptical NGC 5216 also helped driving out gas from NGC 5218.) Therefore NGC 5218 has a rich, brilliant, smoothly distributed population of stars of spectral class A (and possibly late B), a spectacular remnant of its past starburst, but hardly any O-stars any more. NGC 5218 is likely in transition into into a "red and dead", elliptical galaxy.
Full resolution of the image can be seen [url=http://www.caelumobservatory.com/gallery/n5216.shtml]here[/url].
Ann