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Cartwheel Galaxy (ESO 350-40)


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Cartwheel Galaxy (車輪銀河)
Lenticular Galaxy (レンズ状銀河)
Ring Galaxy (リング銀河)


別名 (Other names)
PGC 2248, ESO 350-40, MCG -06-02-022a

明るさ (Brightness)
15.2等級

星座 (Constellation)

ちょうこくしつ座 (Scl) (Sculptor)


距離 (Distance)
5億光年 (500 million light-years)

Cartwheel Galaxy (ESO 350-40) is a lenticular galaxy located 500 million light years from the Earth in the constellation Sculptor.

Cartwheel Galaxy (ESO 350-40) : Picture

Cartwheel Galaxy (ESO 350-40)
Cartwheel Galaxy (ESO 350-40)
(C) NASA/ESA/Hubble
An image of the Cartwheel Galaxy taken with the NASA/ESA Hubble Space Telescope has been reprocessed using the latest techniques to mark the closure of the Space Telescope European Coordination Facility (ST-ECF), based near Munich in Germany, and to celebrate its achievements in supporting Hubble science in Europe over the past 26 years.

Astronomer Bob Fosbury, who is stepping down as Head of the ST-ECF, was responsible for much of the early research into the Cartwheel Galaxy along with the late Tim Hawarden — including giving the object its very apposite name — and so this image was selected as a fitting tribute. The object was first spotted on wide-field images from the UK Schmidt telescope and then studied in detail using the Anglo-Australian Telescope.

Lying about 500 million light-years away in the constellation of Sculptor, the cartwheel shape of this galaxy is the result of a violent galactic collision. A smaller galaxy has passed right through a large disc galaxy and produced shock waves that swept up gas and dust — much like the ripples produced when a stone is dropped into a lake — and sparked regions of intense star formation (appearing blue). The outermost ring of the galaxy, which is 1.5 times the size of our Milky Way, marks the shock wave’s leading edge. This object is one of the most dramatic examples of the small class of ring galaxies.

Cartwheel Galaxy
Cartwheel of Fortune
(C) Chandra, GALEX, Hubble, Spitzer - Composite: NASA/JPL/Caltech/P.Appleton et al.
By chance, a collision of two galaxies has created a surprisingly recognizable shape on a cosmic scale - The Cartwheel Galaxy. The Cartwheel is part of a group of galaxies about 400 million light years away in the constellation Sculptor (two smaller galaxies in the group are visible below and left). Its rim is an immense ring-like structure over 100,000 light years in diameter, composed of star forming regions filled with extremely bright, massive stars. When galaxies collide they pass through each other, their individual stars do not come into contact. However, this ring-like shape is the result of gravitational disruption caused by a smaller galaxy passing through a large one, compressing the interstellar gas and dust and causing a star formation wave to move out like a ripple across the surface of a pond. This false-color composite image of the Cartwheel Galaxy is from space-based observatories. The Chandra X-ray Observatory data is in purple, the Galaxy Evolution Explorer ultraviolet view is in blue, the Hubble Space Telescope visible light picture is in green and the Spitzer Space Telescope infrared image is in red.

Cartwheel Galaxy (ESO 350-40)
Cartwheel Galaxy (ESO 350-40)
(C) Kirk Borne (ST ScI), and NASA/ESA

Cartwheel Galaxy (ESO 350-40)
Cartwheel Galaxy (ESO 350-40)
(C) Curt Struck and Philip Appleton (Iowa State University), Kirk Borne (Hughes STX Corporation), and Ray Lucas (Space Telescope Science Institute), and NASA/ESA

Cartwheel Galaxy (ESO 350-40)
Cartwheel Galaxy (ESO 350-40)
(C) Curt Struck and Philip Appleton (Iowa State University), Kirk Borne (Hughes STX Corporation), and Ray Lucas (Space Telescope Science Institute), and NASA/ESA
Researchers analyzing the Hubble Space Telescope's dramatic images of the Cartwheel galaxy have discovered immense comet-like clouds of gas speeding at nearly 700,000 mph through the galaxy's core.

Cartwheel Galaxy Cartwheel Galaxy
Cartwheel Galaxy
(C) NASA/ESA/Hubble
Cartwheel Galaxy
(C) NASA/ESA/Hubble
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