Arp 72 (Gary Imm)

Arp 72

This tiny object is two interacting galaxies located 150 million light years away in the constellation of Serpens. It is in the Arp subcategory of "spiral galaxies with small high surface brightness companions on arms". I found the details of this object to be fascinating.

NGC 5996 is the bright disturbed barred spiral galaxy, while NGC 5994 is the small companion just above and to the left. The apparent size of NGC 5996 of 1.6 arc-minutes corresponds to a diameter of 70,000 light years. The cores of the 2 galaxies are located about 60,000 light years apart.

NGC 5996 is a starburst galaxy, where the gravitation interaction has triggered star formation in the galaxy arms, visible as bright blue clusters. It is a spiral galaxy with a long bar, two arms, and several areas of disturbance. The arm spiraling towards the companion has a Vorontsov-Velyaminov kink. The arm spiraling away from the companion is severely disturbed, bending back upon itself. Most interesting to me is the faint star stream which extends out to the lower right and arcs upward, like a miniature version of the star streams seen in the Antennae Galaxies.

The faint blue smudge below and right of this object, just above the bottom center of the image, is a small galaxy which is also located 150 million light years away. Based on its shape and distance, it could mean that this object is actually a trio of interacting galaxies. Many other tiny interesting galaxies are seen throughout the image.

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Cloudy Nights
Arp's Peculiar Galaxies
Takahashi Refractors
ZWO ASI183/QHY183

Arp Catalog (Complete)
Barred Galaxies
Bridged Companions
Starburst Galaxies
VV Galaxy Rows

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Status	Advanced success
Started	...
Astrometry.net job	2820339
PixInsight job	7UBCED3G4BJHQI29ZWDL2C5TUUIYF09Y
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	15h47m10s.537
RA (top/left)	15h46m07s.809
RA (top/right)	15h48m15s.375
RA (bottom/right)	15h48m13s.393
RA (bottom/left)	15h46m05s.564

Dec (center)	+17°49′46″.77
Dec (top/left)	+17°38′25″.34
Dec (top/right)	+17°39′06″.89
Dec (bottom/right)	+18°01′07″.11
Dec (bottom/left)	+18°00′25″.33

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