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NGC 5253 (Dwarf Galaxy)


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NGC 5253
Dwarf Galaxy (矮小銀河)
Gx S/P


別名 (Other names)
PGC 48334, ESO 445-4, MCG -5-32-60

明るさ (Brightness)
10.1等級

星座 (Constellation)
ケンタウルス座 (Cen) (Centaurus)


距離 (Distance)
1,200万光年 (12 million light-years)

NGC 5253 is a dwarf galaxy located 12 million light years from the Earth in the constellation Centaurus.

NGC 5253 (Dwarf Galaxy) : Picture

Irregular galaxy NGC 5253
Irregular galaxy NGC 5253
(C) NASA/ESA
NGC 5253 is one of the nearest of the known Blue Compact Dwarf (BCD) galaxies, and is located at a distance of about 12 million light-years from Earth in the southern constellation of Centaurus. The most characteristic signature of these galaxies is that they harbor very active star-formation regions. This is in spite of their low dust content and comparative lack of elements heavier than hydrogen and helium, which are usually the basic ingredients for star formation.

These galaxies contain molecular clouds that are quite similar to the pristine clouds that formed the first stars in the early Universe, which were devoid of dust and heavier elements. Hence, astronomers consider the BCD galaxies to be an ideal test bed for better understanding the primordial star-forming process.

NGC 5253 does contain some dust and heavier elements, but significantly less than the Milky Way galaxy. Its central regions are dominated by an intense star forming region that is embedded in an elliptical main body, which appears red in Hubble’s image. The central starburst zone consists of a rich environment of hot, young stars concentrated in star clusters, which glow in blue in the image. Traces of the starburst itself can be seen as a faint and diffuse glow produced by the ionized oxygen gas.

Irregular galaxy NGC 5253
Irregular galaxy NGC 5253
(C) NASA/ESA
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