Arp 157 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Pisces (Psc) · Contains: NGC 520

Arp 157

This object is a pair of colliding spiral galaxies located 80 million light years away in the constellation of Pisces at a declination of +4 degrees. The width to our apparent view is almost 5 arc-minutes, which corresponds to a true span of about 130,000 light years.

The two galaxy disks seem to be plainly visible to me. One appears to be similar in structure to the Hamburger Galaxy, with a dark wide dust band that is obscuring the remains of the core on the right side. On the left side, the core of the second galaxy, with no visible dust bands, is seen. Bluish tidal star streams extend from each end. Scientists believe that the two disk planes of these galaxies were perpendicular to their orbital plane, which helped to facilitate the merger process.

There are 2 interesting smudges in this image. The faint smudge just above the merging galaxies, in the star streams, is a small cloud of hot blue stars that is part of the star formation process of the merger. This cloud is easily resolved on the Hubble image of this object. The second smudge is the faint smudge to the lower left. This is the dwarf galaxy UGC 957, which is believed to be a result of this merger.

Many tiny faint galaxies, galaxy clusters, and quasars are visible throughout the background.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced success
Started	...
Astrometry.net job	2894322
PixInsight job	H8S9OUPBH3FKTA1B52JS7OWA9EXH4CDB
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	01h24m34s.410
RA (top/left)	01h23m33s.500
RA (top/right)	01h25m08s.160
RA (bottom/right)	01h25m35s.330
RA (bottom/left)	01h24m00s.785

Dec (center)	+03°47′12″.63
Dec (top/left)	+03°44′46″.50
Dec (top/right)	+03°34′18″.26
Dec (bottom/right)	+03°49′38″.96
Dec (bottom/left)	+04°00′06″.78

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