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Arp 81 (Interacting Galaxy)


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Arp 81
Interacting Galaxy (相互作用銀河)

別名 (Other names)
VV 247, Vll Zw 778, KPG 534A,
(NGC 6621, PGC 61582, UGC 11175, MCG 11-22-30)
(NGC 6622, PGC 61579, UGC 11175, Arp 81)

明るさ (Brightness)

NGC 6621 : 13.2等級
NGC 6622 : 15等級


星座 (Constellation)
りゅう座 (Dra) (Draco)

距離 (Distance)
2億8,000万光年 (280 million light-years)

Arp 81 is an interacting galaxy located 280 million light years from the Earth in the constellation Draco.

Arp 81 (Interacting Galaxy) : Picture

Arp 81
Arp 81: 100 Million Years Later
Image Credit: Hubble Legacy Archive, ESA, NASA; Processing - Martin Pugh

Arp81の画像
Arp 81: 100 Million Years Later
(C) NASA
From planet Earth, we view this strongly interacting pair of galaxies, cataloged as Arp 81, as they were only about 100 million years after their mutual closest approach. The havoc wreaked by gravity during their ominous encounter is detailed in this color composite image from the Hubble Space Telescope, showing twisted streams of gas and dust, a chaos of massive star formation, and a tidal tail stretching for 200 thousand light-years or so as it sweeps behind the cosmic wreckage. Also known as NGC 6622 (left) and NGC 6621, the galaxies are roughly equal in size but are destined to merge into one large galaxy in the distant future, making repeated approaches until they finally coalesce. Located in the constellation Draco, the galaxies are 280 million light-years away. The dark vertical band which seems to run through NGC 6621's location is a camera artifact.

Arp81
Arp 81
(C) NASA

Arp 81
Arp 81
(C) NASA/ESA/Hubble
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