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Robert's Quartet


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Robert's Quartet (ロバートの四つ子銀河)

名前
(Name)
分類 明るさ
(Brightness)
別名
(Other names)
NGC 87 Gx Irr 14.1 PGC 1357, ESO 194-8, AM 0018-485
NGC 88 Gx SB0-a 14.1 PGC 1370, ESO 194-10, AM 0018-485
NGC 89 Gx SB0-a 13.3 PGC 1374, ESO 194-11, AM 0018-485
NGC 92 Gx Sa 12.9 PGC 1388, ESO 194-12, AM 0018-485

距離 (Distance)
1億6,000万光年 (160 million light-years)


星座 (Constellation)
ほうおう座 (Phe) (Phoenix)

Robert's Quartet is an interacting galaxy located 160 million light years from the Earth in the constellation Phoenix.

Robert's Quartet : Picture

Robert's Quartet
Robert's Quartet
(C) ESO
Robert's Quartet is a family of four very different galaxies, located at a distance of about 160 million light-years, close to the centre of the southern constellation of the Phoenix. Its members are NGC 87, NGC 88, NGC 89 and NGC 92, discovered by John Herschel in the 1830s.

NGC 87 (upper right) is an irregular galaxy similar to the satellites of our Milky Way, the Magellanic Clouds. NGC 88 (centre) is a spiral galaxy with an external diffuse envelope, most probably composed of gas. NGC 89 (lower middle) is another spiral galaxy with two large spiral arms. The largest member of the system, NGC 92 (left), is a spiral Sa galaxy with an unusual appearance. One of its arms, about 100,000 light-years long, has been distorted by interactions and contains a large quantity of dust.

NGC 92
NGC 92 in H-alpha
(C) ESO
The largest member of the galaxy group known as Robert''s Quartet is NGC 92, a spiral Sa galaxy with an unusual appearance. One of its arms, about 100,000 light-years long, has been distorted by interactions and contains a large quantity of dust. Using this H-alpha image obtained with FORS2 on the VLT, astronomers were able to study the properties of regions of active star formation ("HII regions"). They found more than 200 of such regions in NGC 92, with a size between 500 and 1,500 light-years.

Robert's Quartet NGC 92
Robert's Quartet
(C) ESO
NGC 92
(C) ESO
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