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Arp 142 (Penguin Galaxy), NGC 2936 and NGC 2937


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Arp 142 (NGC 2936 and NGC 2937)
Penguin Galaxy (ペンギン銀河)
Porpoise Galaxy (イルカ銀河)
Interacting Galaxy (相互作用銀河)


名前
(Name)
分類 明るさ
(Brightness)
別名
(Other names)
NGC 2936 Gx I? 12.9 PGC 27422, UGC 5130, Arp 142
NGC 2937 Gx E 13.6 PGC 27423, UGC 5131, Arp 142

距離 (Distance)
3億光年 (300 million light-years)

星座 (Constellation)
うみへび座 (Hya) (Hydra)

Arp 142 (Porpoise Galaxy) is an interacting galaxy located 300 million light years from the Earth in the constellation Hydra.

Arp 142 (Penguin Galaxy), NGC 2936/7 : Picture

The Porpoise Galaxy from Hubble
The Porpoise Galaxy from Hubble
(C) NASA, ESA, and The Hubble Heritage Team (STSci/AURA)
What's happening to this spiral galaxy? Just a few hundred million years ago, NGC 2936, the upper of the two large galaxies shown, was likely a normal spiral galaxy -- spinning, creating stars -- and minding its own business. But then it got too close to the massive elliptical galaxy NGC 2937 below and took a dive. Dubbed the Porpoise Galaxy for its iconic shape, NGC 2936 is not only being deflected but also being distorted by the close gravitational interaction. A burst of young blue stars forms the nose of the porpoise toward the left of the upper galaxy, while the center of the spiral appears as an eye. Alternatively, the galaxy pair, together known as Arp 142, look to some like a penguin protecting an egg. Either way, intricate dark dust lanes and bright blue star streams trail the troubled galaxy to the lower right. The above recently-released image showing Arp 142 in unprecedented detail was taken by the Hubble Space Telescope last year. Arp 142 lies about 300 million light years away toward the constellation, coincidently, of Hydra. In a billion years or so the two galaxies will likely merge into one larger galaxy.

The Porpoise Galaxy from Hubble
The Porpoise Galaxy from Hubble
(C) NASA, ESA, and The Hubble Heritage Team (STSci/AURA)

Arp 142 Arp 142
Arp 142
(C) NASA/ESA
Arp 142
(C) NASA/ESA
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Arp 142 (Penguin Galaxy), NGC 2936/7 : Movie

Hubblecast 67: Of galaxies and penguins — Arp 142
This episode of the Hubblecast explores the violent world of galactic mergers, as shown by the cosmic duo Arp 142 in a stunning new image from the NASA/ESA Hubble Space Telescope.

Galaxies spend most of their life drifting through the cosmic expanse in isolation. But, every so often, two unfortunate galaxies stray a little too close to one another — as is the case with Arp 142. Showcased in a stunning new image from Hubble, these two galaxies uncannily resemble a penguin guarding its egg. The galaxies are in middle of a violent merger, with clouds of gas and dust colliding at breakneck speeds and triggering bursts of star formation.
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