The Ring Galaxy

Comments and questions about the APOD on the main view screen.
harry
G'day G'day G'day G'day
Posts: 2881
Joined: Fri Nov 18, 2005 8:04 am
Location: Sydney Australia

The Ring Galaxy

Post by harry » Tue Nov 22, 2005 6:43 am

http://antwrp.gsfc.nasa.gov/apod/ap051022.html
Looking at the shape of this galaxy I would say the collision was NOT done by a small galaxy going through the centre but by the core of the galaxy shifting faster to one side maybe by push pull by another galaxy.
Most galaxies have gone through some form of collision. Even our own Milky Way look at our 3 little saterlite galaxies.
Harry : Smile and live another day.

l3p3r
Science Officer
Posts: 142
Joined: Tue Nov 22, 2005 12:47 pm
Location: Hobart, Australia

Post by l3p3r » Tue Nov 22, 2005 1:05 pm

with a one on distance-squared relationship for the force exerted on objects by gravity it would seem to me that another galaxy would have to float very much straight through to have the center taper out as it does in that image
(i expect it is stretched in the direction of movement of the colliding galaxy)

Empeda2
Science Officer
Posts: 176
Joined: Sat Oct 29, 2005 9:02 am

Post by Empeda2 » Tue Nov 22, 2005 1:39 pm

Maybe - but a ripple on a pond moves perpendicular to the distrubance that caused it.
The Artist Formerly Known as Empeda

l3p3r
Science Officer
Posts: 142
Joined: Tue Nov 22, 2005 12:47 pm
Location: Hobart, Australia

Post by l3p3r » Tue Nov 22, 2005 1:52 pm

this is more of a gradual dragging effect

Empeda2
Science Officer
Posts: 176
Joined: Sat Oct 29, 2005 9:02 am

Post by Empeda2 » Tue Nov 22, 2005 4:27 pm

True - but if it passes through the middle, it'll initially be dragged on way, and then the other producing a more ripply type effect?
The Artist Formerly Known as Empeda

harry
G'day G'day G'day G'day
Posts: 2881
Joined: Fri Nov 18, 2005 8:04 am
Location: Sydney Australia

Post by harry » Wed Nov 23, 2005 7:49 am

Something has changed the structure of a spiral galaxy.
If a smaller galaxy went through the centre there would have been a pulling effect causing a much deformed galaxy. This would have been over thousands of years. The shift of the galactic centre to the left with a deformed spiral would also require the loss of gravity from its centre.
Must think more on this line.
The shift must have been very slow but! quick caused by an external force affecting not only the galaxtic centre but also the structure of the spiral. Maybe a combination.
Hey! maybe a few large blackholes near the galactic centre created a chaos that may have ajusted the galactic centre.

Stay Cool
Harry : Smile and live another day.