NGC 2782 - Arp 215 Starburst Galaxy in Lynx. (astroeyes)

Celestial hemisphere: Northern · Constellation: Lynx (Lyn) · Contains: NGC 2782

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NGC 2782 - Arp 215 Starburst Galaxy in Lynx.

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NGC 2782 - Arp 215 Starburst Galaxy in Lynx.

The starburst galaxy Arp 215 or NGC 2782 lies about 110 million light years away toward the Lynx constellation. My image shows the result when two galaxies of unequal mass collided about 200 million years ago. Their gravitational pull ripped out two tails of debris with very different properties.

The optically bright eastern tail has some neutral hydrogen gas and molecular gas at the base of the tail, and an optically bright, but gas-poor concentration at the end of the tail. The optically faint western tail is rich in neutral hydrogen gas, but has no molecular gas, yet astronomers have recently found blue star clusters younger than 100 million years along both tails, indicating that those stars formed within both tails after the galaxy collision occured.

Current star-formation theory suggests that star clusters are formed from the collapse of giant molecular gas clouds, but if this were the case, astronomers would expect to see remnants of the molecular gas which helped give birth to the stars in both of the tails of NGC 2782.

Finding unexpected young star clusters in the western tail could help explain why stars form in other places where there is little molecular gas, like the outer edges of the Milky Way galaxy or in the debris of other galaxy collisions.

My image, collected in a rare moment of clarity in December last year, shows the bright tail but the faint tail is not apparent. The new born star clusters in the bright tail are just visible in the image.

It is the result of about 60 x 120 second exposures.

There is a fairly bright 19th mag quasar at the indicated position, not far from the little edge-on SBc, 16th mag. galaxy UGC 4872. There are other quasars nearby but out of the fov in this shot.

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Status	Basic success
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Astrometry.net job	6578784
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NGC 2782 - Arp 215 Starburst Galaxy in Lynx.

NGC 2782 - Arp 215 Starburst Galaxy in Lynx.

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NGC 2782 - Arp 215 Starburst Galaxy in Lynx.

NGC 2782 - Arp 215 Starburst Galaxy in Lynx.

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