Distance 300 Mly Type E2 pec / SB(s)bc pec | Apparent magnitude (V) 14.4 / 13.9 Constellation Pegasus | |
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Right ascension 22 35 56.7 / 22 35 58.4 Declination +33° 57′ 56″ / +33° 57′ 57″ Redshift 6630 ± 23 / 5774 ± 24 km/s Similar NGC 7319, NGC 7320, NGC 7317, NGC 7320c, NGC 7318A | ||
NGC 7318 (also known as UGC 12099/UGC 12100 or HCG 92d/b) are a pair of colliding galaxies about 300 million light-years from Earth. They appear in the Constellation Pegasus and are members of the Stephan's Quintet.
The Spitzer Space Telescope revealed the presence of a huge intergalactic shock wave, shown by a green arc produced by one galaxy falling into another at millions of kilometers per hour. As NGC 7318B collides with NGC 7318A, gas spread throughout the cluster, atoms of hydrogen are heated in the shock wave, producing the green glow. The molecular hydrogen visible in the collision is one of the most turbulent forms known. This phenomenon was discovered by an international team of scientists of the Max Planck Institute for Nuclear Physics (MPIK) in Heidelberg. This collision can help provide a view into what happened in the early universe, around 10 billion years ago.