Arp 294 (Gary Imm)

Arp 294

This object is a pair of interacting galaxies located 130 million light years away in the constellation of Ursa Major at a declination of +32 degrees. Each galaxy spans about 2 arc-minutes in our apparent view, which corresponds to an actual diameter of 75,000 light years. I couldn’t find anything written about this pair.

The vertical galaxy is NGC 3788. This is the brighter galaxy, with a magnitude of 12.5. The disk is hard to see because it is edge-on, but there appears to be both an inner ring and an outer ring. I would love to see this galaxy face-on.

NGC 3786 is slightly dimmer at 13.7 magnitude. It has a large dust blotch to the upper right of the core. The disk is in two distinct parts. The inner disk is well defined while the outer disk is very diffuse.

I believe that these two galaxies are interacting based on 3 observations. First, the galaxy disks appear slightly disturbed, with odd dust lane patterns. Second, bright star clusters indicated that star formation has initiated. And third, and most important, very faint star streams are seen extending up from NGC 3788 and down from NGC 3786. These faint streams are hard to see in the static image. A good way to see faint star streams is to zoom in and out of the image repeatedly with the middle mouse scroll button (image must be downloaded). I only see these types of extended star streams with interacting galaxies.

Galaxy PGC 36140, in the lower right corner of the image, appears really messed up to me. It is about 400 million light years away.

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Arp's Peculiar Galaxies
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Arp Catalog (Complete)
Galaxy - Outer Closed Ring
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Status	Advanced success
Started	...
Astrometry.net job	3514424
PixInsight job	3Y7DH2JDUQ6IAN58JC8IQTW3ZFC4TKLN
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	11h39m42s.970
RA (top/left)	11h40m16s.850
RA (top/right)	11h39m08s.519
RA (bottom/right)	11h39m09s.146
RA (bottom/left)	11h40m17s.366

Dec (center)	+31°55′11″.21
Dec (top/left)	+32°00′19″.99
Dec (top/right)	+32°00′09″.32
Dec (bottom/right)	+31°50′01″.98
Dec (bottom/left)	+31°50′12″.46

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Arp 294

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