Arp 104 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 5216 · NGC 5218

Arp 104

This object is a pair of interacting galaxies known as Arp 104, located 140 million light years away in the constellation of Ursa Major. The disturbed barred spiral galaxy on the right is NGC 5218, while the elliptical galaxy on the left is NGC 5216. This galaxy pair is named after astronomer P. C. Keenan, who first observed the wondrous filament that connects the two galaxies.

The filament is comprised of a cosmic trail of gas, dust, and stars, resulting from the gravitational interaction between these two galaxies. The trail is 200,000 light-years long. Also of interest, and tangentially aligned with the filament, is the single arm which extends out from the elliptical galaxy. Normally, elliptical galaxies are featureless, so this arm is also likely the result of the gravitational interaction.

Almost as interesting as the filament to me is the unique shape of NGC 5218. It is hard to know because we only see it from one point of view, but it looks like a barred spiral galaxy with an outer arm that is wildly distorted out of plane. The distorted core is very bright, perhaps the result of star formation being excited by the gravitational disturbance.

A number of smaller, faint galaxies are also visible in the image.

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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.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	2033428
PixInsight job	XRCUJ2XLJ0S195NNN0QOUA1VPHRCG4OH
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	13h32m09s.563
RA (top/left)	13h33m11s.219
RA (top/right)	13h33m46s.456
RA (bottom/right)	13h31m06s.650
RA (bottom/left)	13h30m34s.290

Dec (center)	+62°44′02″.64
Dec (top/left)	+62°26′49″.19
Dec (top/right)	+62°59′02″.86
Dec (bottom/right)	+63°01′14″.75
Dec (bottom/left)	+62°28′58″.36

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Arp 104

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