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Arp-Madore 135-650 | by geckzilla
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Arp-Madore 135-650

One-color image of the disturbed galaxy Arp-Madore 135-650, also known as NGC 646. This was observed for one of the gap-filler programs. If I could make a color image, it might appear blueish up top where all the star formation is ongoing, and less blue at the bottom. This is what makes the galaxy interesting, according to a brief mention on Twitter by principle investigator Julianne Dalcanton:


The puzzle is to figure out why is it all clumpy and star-formy on one side, but smooth and not so much on the other side.


I cleaned off a satellite trail and a few hundred cosmic rays.


Data from the following proposal is used to create this image:

Establishing HST's Low Redshift Archive of Interacting Systems


All channels: ACS/WFC F606W


North is NOT up. It is 43.07° counter-clockwise from up.

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Uploaded on September 11, 2018