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IC 755 (Edge-on Spiral Galaxy)


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IC 755
Edge-on Spiral Galaxy (エッジオン銀河)
Gx SBb

別名 (Other names)
NGC 4019, PGC 37912, UGC 7001

明るさ (Brightness)
13.2等級

星座 (Constellation)
かみのけ座 (Com) (Coma Berenices)


距離 (Distance)
7,000万光年 (70 million light-years)

IC 755 is a spiral galaxy located 70 million light years from the Earth in the constellation Coma Berenices.

IC 755 (Edge-on Spiral Galaxy) : Picture

IC 755 (Edge-on Spiral Galaxy)
IC 755 (Edge-on Spiral Galaxy)
(C) NASA/ESA/Hubble
The NASA/ESA Hubble Space Telescope has imaged an elongated stream of stars, gas and dust called IC 755, which is actually a spiral galaxy that we are seeing edge-on.

In 1999 a star within IC 755 was seen to explode as a supernova and named SN 1999an. The supernova was discovered by the Beijing Astronomical Observatory Supernova Survey and three years later Hubble was used to study the environment in which the explosion took place. The inclination of the galaxy made the supernova a challenging target as many other intervening objects obscured the view. Valuable data were obtained and suggest that before detonation the star may have been around 20 times more massive than our Sun, and that it was likely to have been in the region of 14 million years old.

Supernovae like SN 1999an are classified as Type IIs and they are dramatic events that mark the end of the lives of massive stars. They have an important role to play in galaxy evolution as many elements are formed during the explosion and are ejected with such force that they are distributed far and wide. Shockwaves also help to mix material within the host galaxy and may spark new rounds of star formation. Billions of stars make up galaxies like IC 755 and many will become supernovae, using their final moments to breathe new life into the rest of the Universe.

IC 755 (Edge-on Spiral Galaxy)
IC 755 (Edge-on Spiral Galaxy)
(C) NASA/ESA/Hubble
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