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HCG 92 (Stephan's Quintet)


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HCG 92 (Hickson Compact Group 92)
Stephan's Quintet (ステファンの五つ子)


名前
(Name)
分類 明るさ
(Brightness)
別名
(Other names)
NGC 7317 Gx E4 13.6 Arp 319, PGC 69256, MCG 6-49-38
NGC 7318A,
NGC 7318B
Gx E2/P 13.4 PGC 69260, UGC 12099
NGC 7319 Gx SBbc 13.3 Arp 319, PGC 69269, UGC 12102
NGC 7320 Gx Scd 12.5 Arp 319, PGC 69270, UGC 12101

距離 (Distance)
2億7,000万光年 (270 million light-years)


星座 (Constellation)
ペガスス座 (Peg) (Pegasus)

音声再生 (Voice)
再生 ×1.25 ×1.5
ヒクソン・コンパクト銀河群 (略号: HCG)は、ポール・ヒクソンにより1982年に出版されたカタログに掲載された銀河の集団の総称です。
ヒクソン・コンパクト銀河群のうちで最も有名なものは、「ステファンの五つ子」と呼ばれるHCG 92です。

ヒクソンによれば、ほとんどのコンパクト銀河群には特徴的な形状・運動を持つ銀河、あるいは中心部が電波や赤外線で明るい銀河、スターバースト銀河や活動銀河核(AGN)が高い確率で含まれています。
コンパクト銀河群は大量の希薄なガスでおおわれており、重力的には暗黒物質に支配されています。

またコンパクト銀河群はより緩やかな銀河の集団の一部を形成しており、重力による進化を見せます。
このため、コンパクト銀河群に含まれる銀河は衝突し、銀河群とは呼べないものになります。
このようなコンパクト銀河は大量に存在し、銀河の進化に関してとても重要な役割を果たしています。

Stephan's Quintet (HCG 92) is an interacting galaxy located 270 million light years from the Earth in the constellation Pegasus.

HCG 92 (Stephan's Quintet) : Picture

HCG 92 (Stephan's Quintet)
HCG 92 (Stephan's Quintet)
(C) NASA, 2009
The first identified compact galaxy group, Stephan's Quintet is featured in this stunning image from the newly upgraded Hubble Space Telescope. About 300 million light-years away, only four galaxies of the group are actually locked in a cosmic dance of repeated close encounters. The odd man out is easy to spot, though. The four interacting galaxies (NGC 7319, 7318A, 7318B, and 7317) have an overall yellowish cast and tend to have distorted loops and tails, grown under the influence of disruptive gravitational tides. But the bluish galaxy at the upper left (NGC 7320) is much closer than the others. A mere 40 million light-years distant, it isn't part of the interacting group. In fact, individual stars in the foreground galaxy can be seen in the sharp Hubble image, hinting that it is much closer than the others. Stephan's Quintet lies within the boundaries of the high flying constellation Pegasus.

Stephan's Quintet
Stephan's Quintet Plus One
Image Assembly & Processing: Robert Gendler and Judy Schmidt, Image Data: Subaru Telescope (NAOJ), Hubble Legacy Archive, R. Gendler
The first identified compact galaxy group, Stephan's Quintet is featured in this remarkable image constructed with data drawn from Hubble Legacy Archive and the Subaru Telescope on the summit of Mauna Kea. The galaxies of the quintet are gathered near the center of the field, but really only four of the five are locked in a cosmic dance of repeated close encounters taking place some 300 million light-years away. The odd man out is easy to spot, though. The interacting galaxies, NGC 7319, 7318A, 7318B, and 7317 have a more dominant yellowish cast. They also tend to have distorted loops and tails, grown under the influence of disruptive gravitational tides. The mostly bluish galaxy, NGC 7320, is in the foreground about 40 million light-years distant, and isn't part of the interacting group. Still, captured in this field above and to the left of Stephan's Quintet is another galaxy, NGC 7320C, that is also 300 million light-years distant. Of course, including it would bring the four interacting galaxies back up to quintet status. Stephan's Quintet lies within the boundaries of the high flying constellation Pegasus. At the estimated distance of the quintet's interacting galaxies, this field of view spans over 500,000 light-years.

Stephan's Quintet
Stephan's Quintet
(C) NASA, 2012
The first identified compact galaxy group, Stephan's Quintet is featured in this eye-catching image constructed with data drawn from the extensive Hubble Legacy Archive. About 300 million light-years away, only four of these five galaxies are actually locked in a cosmic dance of repeated close encounters. The odd man out is easy to spot, though. The interacting galaxies, NGC 7319, 7318A, 7318B, and 7317 have an overall yellowish cast. They also tend to have distorted loops and tails, grown under the influence of disruptive gravitational tides. But the predominantly bluish galaxy, NGC 7320, is closer, just 40 million light-years distant, and isn't part of the interacting group. Stephan's Quintet lies within the boundaries of the high flying constellation Pegasus. At the estimated distance of the quartet of interacting galaxies, this field of view spans about 500,000 light-years. However, moving just beyond this field, above and to the left, astronomers can identify another galaxy, NGC 7320C, that is also 300 million light-years distant. Of course, including it would bring the interacting quartet back up to quintet status.

HCG 92 (Stephan's Quintet)
HCG 92 (Stephan's Quintet)
(C) NASA
HCG 92 (Stephan's Quintet)
HCG 92 (Stephan's Quintet)
(C) NASA

HCG 92 (Stephan's Quintet)
HCG 92 (Stephan's Quintet)
(C) NASA

Galaxies in Pegasus
Galaxies in Pegasus
(C) Alessandro Benedetti and Daniele Ceniti (AeW Observatory)
This wide, sharp telescopic view reveals galaxies scattered beyond the stars and faint dust nebulae of the Milky Way at the northern boundary of the high-flying constellation Pegasus. Prominent at the upper right is NGC 7331. A mere 50 million light-years away, the large spiral is one of the brighter galaxies not included in Charles Messier's famous 18th century catalog. The disturbed looking group of galaxies at the lower left is well-known as Stephan's Quintet. About 300 million light-years distant, the quintet dramatically illustrates a multiple galaxy collision, its powerful, ongoing interactions posed for a brief cosmic snapshot. On the sky, the quintet and NGC 7331 are separated by about half a degree.

HCG 92 (Stephan's Quintet) HCG92 (Stephan's Quintet)
HCG 92 (Stephan's Quintet)
(C) NASA
Disorder in Stephan's Quintet
Disorder in Stephan's Quintet
(C) NASA, 1996
HCG 92 (Stephan's Quintet)
(C) NASA
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HCG 92 (Stephan's Quintet) : Movie

Stephan's Quintet in 60 Seconds
This beautiful image gives a new look at Stephan's Quintet, a compact group of galaxies discovered about 130 years ago and located about 280 million light years from Earth.
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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。
ヒクソン・コンパクト銀河群. (2011, December 17). In Wikipedia.
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