Arp 263 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Leo (Leo) · Contains: NGC 3239

Arp 263

This beautiful and wondrous object is an irregular galaxy located 25 million light years away in the constellation of Leo. It is much smaller than our Milky Way, at a diameter of 40,000 light years. The galaxy is a bit obscured by the bright foreground Milky Way star, HD 222046.

As reflected by its Arp designation, the structure of this galaxy suggests that it has been involved in an interaction with another galaxy. The tidal star streams, bright blue star clusters, and faint Ha star forming regions also support the idea of recent galaxy interaction. Although many background galaxies are visible here, none are close enough to suggest a companion galaxy, Consequently, we are likely looking at the aftermath of a merger between two galaxies.

This galaxy is an extreme example that symmetry is not always seen in galaxies. The right galaxy tail contains many Ha regions and is bluish in color, while the left galaxy tail does not contain any Ha regions and is yellowish in color. Both tails extend below the disk. A remnant of a core appears to be towards the left side of the disk.

The most interesting part of this image to me is what appears to be a mass of large bright blue star clusters just to the left of the foreground star. This mass has been called a giant HII region by several publications, although no other detail or explanation is given. This is the first time I have seen such a disproportionately large mass of star clusters.

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Description: Comparison to Original Arp Image

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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	2483506
PixInsight job	0K189NMUA476ANNQSZDU07T3NO3G3PDO
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	10h25m06s.374
RA (top/left)	10h26m08s.674
RA (top/right)	10h24m05s.781
RA (bottom/right)	10h24m04s.178
RA (bottom/left)	10h26m06s.857

Dec (center)	+17°09′30″.55
Dec (top/left)	+17°18′38″.62
Dec (top/right)	+17°19′16″.52
Dec (bottom/right)	+17°00′21″.27
Dec (bottom/left)	+16°59′43″.46

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Arp 263

Arp 263

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