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HCG 90 (Hickson Compact Group 90)


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HCG 90 (Hickson Compact Group 90)

名前
(Name)
分類 明るさ
(Brightness)
別名
(Other names)
NGC 7173 Gx E 11.9 PGC 67878, MCG -5-52-8, HCG 90C
NGC 7174 Gx Sab 13.1 PGC 67881, MCG -5-52-10, HCG 90D
NGC 7176 Gx E 11.5 PGC 67883, MCG -5-52-11, HCG 90B

距離 (Distance)
1億光年 (100 million light-years)

星座 (Constellation)
みなみのうお座 (PsA) (Piscis Austrinus)

HCG 90 (Hickson Compact Group 90) is an interacting galaxy located 100 million light years from the Earth in the constellation Piscis Austrinus.

HCG 90 (Hickson Compact Group 90) : Picture

Hickson Compact Group 90
Hickson Compact Group 90
(C) NASA
Scanning the skies for galaxies, Canadian astronomer Paul Hickson and colleagues identified some 100 compact groups of galaxies, now appropriately called Hickson Compact Groups. This sharp Hubble image shows one such galaxy group, HCG 90, in startling detail. Three galaxies are revealed to be strongly interacting: a dusty spiral galaxy stretched and distorted between a pair of large elliptical galaxies. The close encounter will trigger furious star formation. On a cosmic timescale, the gravitational tug of war will eventually result in the merger of the trio into a large single galaxy. The merger process is now understood to be a normal part of the evolution of galaxies, including our own Milky Way. HCG 90 lies about 100 million light-years away in the constellation Piscis Austrinus. This Hubble view spans about 80,000 light-years at that estimated distance. Of course, Hickson Compact Groups also make for rewarding viewing for Earth-bound astronomers with more modest sized telescopes.

Hickson Compact Group HCG 90
Hickson Compact Group HCG 90
(C) ESO
Colour-composite image of the triplet of galaxies, catalogued as NGC 7173 (top), 7174 (bottom right) and 7176 (bottom left), and located 106 million light-years away towards the constellation of Piscis Austrinus. This triplet of galaxies makes up part of the Hickson Compact Group HCG 90. 

NGC 7173 and 7176 are elliptical galaxies, while NGC 7174 is a spiral galaxy with quite disturbed dust lanes and a long, twisted tail. This seems to indicate that the two lower galaxies - whose combined shape bears some resemblance to that of a sleeping baby - are currently interacting. Astronomers have suggested that the three galaxies will finally merge.

NGC 7173, 7174, and 7176
NGC 7173, 7174, and 7176
(C) ESO

HCG 90 NGC 7173, 7174, and 7176
Hickson Compact Group HCG 90
(C) ESO
NGC 7173, 7174, and 7176
(C) ESO
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HCG 90 (Hickson Compact Group 90) : Movie

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