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NGC 660 (Polar Ring Galaxy)


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NGC 660
Polar Ring Galaxy (極リング銀河)
Gx SBa/PRG

別名 (Other names)
PGC 6318, UGC 1201, MCG 2-5-13

明るさ (Brightness)
10.7等級

星座 (Constellation)
うお座 (Psc) (Pisces)


距離 (Distance)
2,000万光年 (20 million light-years)

極リング銀河(きょくりんぐぎんが)とは、ガスや星々が銀河の中心を回転面に対して垂直に周回する極軌道を持つ銀河。

概要
極リング銀河は、NGC 4650AやNGC 660など、100個以上が発見されている。
極リング銀河は、英語ではpolar-ring galaxyという名称で呼ばれている天体。
なぜこのような天体ができたかについては、まだ結論がでていないが、原因は銀河同士の衝突ではないかと言われている。

NGC 660 is a polar ring galaxy located 20 million light years from the Earth in the constellation Pisces.

NGC 660 (Polar Ring Galaxy) : Picture

Polar Ring Galaxy NGC 660
Polar Ring Galaxy NGC 660
(C) NASA
NGC 660 is featured in this cosmic snapshot, a sharp composite of broad and narrow band filter image data from the Gemini North telescope on Mauna Kea. Over 20 million light-years away and swimming within the boundaries of the constellation Pisces, NGC 660's peculiar appearance marks it as a polar ring galaxy. A rare galaxy type, polar ring galaxies have a substantial population of stars, gas, and dust orbiting in rings nearly perpendicular to the plane of the galactic disk. The bizarre-looking configuration could have been caused by the chance capture of material from a passing galaxy by a disk galaxy, with the captured debris eventually strung out in a rotating ring. The violent gravitational interaction would account for the myriad pinkish star forming regions scattered along NGC 660's ring. The polar ring component can also be used to explore the shape of the galaxy's otherwise unseen dark matter halo by calculating the dark matter's gravitational influence on the rotation of the ring and disk. Broader than the disk, NGC 660's ring spans over 50,000 light-years.

NGC660
NGC 660
(C) NASA

NGC660
NGC 660
(C) NASA
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「ウィキペディア(wikipedia):フリー百科事典」より文章引用。
極リング銀河. (2012, October 3). In Wikipedia.
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