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NGC 4102 (Spiral Galaxy)


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NGC 4102
Spiral Galaxy (渦巻銀河)
Gx SBb

別名 (Other names)
PGC 38392, UGC 7096, MCG 9-20-94, ZWG 269.36, IRAS 12038+5259

明るさ (Brightness)
11.3等級

星座 (Constellation)
おおぐま座 (UMa) (Ursa Major)


距離 (Distance)
4,600万光年 (46 million light-years)

NGC 4102 is a spiral galaxy located 46 million light years from the Earth in the constellation Ursa Major.

NGC 4102 (Spiral Galaxy) : Picture

NGC 4102 (Spiral Galaxy)
NGC 4102 (Spiral Galaxy)
(C) ESA/Hubble, NASA and S. Smartt (Queen's University Belfast), Acknowledgement: Renaud Houdinet
The NASA/ESA Hubble Space Telescope observes some of the most beautiful galaxies in our skies — spirals sparkling with bright stellar nurseries, violent duos ripping gas and stars away from one another as they tangle together, and ethereal irregular galaxies that hang like flocks of birds suspended in the blackness of space.

However, galaxies, like humans, are not all supermodels. This little spiral, known as NGC 4102, has a different kind of appeal, with its tightly-wound spiral arms and understated, but charming, appearance.

NGC 4102 lies in the northern constellation of Ursa Major. It contains what is known as a LINER, or low-ionization nuclear emission-line region, meaning that its nucleus emits particular types of radiation — specifically, emission from weakly-ionised or neutral atoms of certain elements. Even in this sense, NGC 4102 is not special; around one third of all nearby galaxies are thought to be LINER galaxies.

Many LINER galaxies also contain intense regions of star formation. This is thought to be intrinsically linked to their centres but just why is still a mystery for astronomers — either the starbursts pour fuel inwards to fuel the LINERs, or this active central region triggers the starbursts. NGC 4102 does indeed contain a starburst region towards its centre, where stars are being created at a rate much more furious than in a normal galaxy. This star formation is taking place within a small rotating disc, around 1,000 light-years in diameter and with a mass some three billion times the mass of the Sun.

NGC 4102 (Spiral Galaxy)
NGC 4102 (Spiral Galaxy)
(C) NASA/ESA/Hubble
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