"Hubble scores a perfect 10", page 1
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Topic started on 7-11-2008 @ 09:35 PM by Jbird
Thought this recently imaged photo composite of one of the original
Arp Atlas of Peculiar Galaxies,
was cool enough to deserve a fresh look.

This mage taken by Hubble in Oct. of this year, of Arp 147 ,
with the Wide Field Planetary Camera 2 (WFPC2) onboard Hubble,
which is being coaxed out of safe mode, after a recent software problems.


www.nasa.gov...

www.nasa.gov...
The blue ring was most probably formed after the galaxy on the left passed through the galaxy on the right. Just as a pebble thrown into a pond creates an outwardly moving circular wave, a propagating ring of higher density was generated at the point of impact. As this excess density collided with outer material that was moving inward due to the gravitational pull of the two galaxies, shocks and dense gas were produced, stimulating star formation.


The red part of the blue ring is presumed to be the impact point.

[edit on 7/11/08 by Jbird]


reply posted on 8-11-2008 @ 12:11 PM by Jbird
reply to post by C.H.U.D.


Ha, ha. True dat. (Took me a minute, C'.)


Not sure what prompted me to post this particular image. Maybe the fact that I've perused the Arp Atlas years ago, and vaguely remember this image ?

Also found it interesting to see that a direct, almost bullet-like, hit would cause the compression ring to form a relative circle , rather than the more commonly seen near misses that tend to perturb each other into an 'S' shape as they interact.
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