Antennae galaxies

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Antennae galaxies
Antennae Galaxies reloaded.jpg
NGC 4038 (left) and NGC 4039 (right)
Observation data (J2000 epoch)
Right ascension 12h 01m 53.0s /  12h 01m 53.6s[2]
Declination−18° 52′ 10″ / −18° 53′ 11″[2]
Redshift1642 ± 12 / 1641 ± 9 km/s[2]
Distance45 Mly / 65 Mly
Apparent magnitude (V)11.2 / 11.1[2]
TypeSB(s)m pec / SA(s)m pec[2]
Apparent size (V)5′.2 × 3′.1 / 3′.1 × 1′.6[2]
Notable featuresInteracting galaxies
Other designations
Ringtail Galaxy,[2] NGC 4038 / 4039,[2]
PGC 37967 / 37969, Arp 244,[2] Caldwell 60/61
See also: Galaxy, List of galaxies

The Antennae galaxies (NGC 4038/NGC 4039) are colliding.[3] They are in the constellation Corvus. The process takes hundreds of millions of years.

The collision, with its clouds of gas, dust and magnetic fields, causes rapid star formation. This is their starburst phase. They were discovered by William Herschel in 1785.[4]

They are in the NGC 4038 group with five other galaxies. These two galaxies are known as the Antennae galaxies because they have two long tails of stars, gas and dust ejected from the galaxies as a result of tidal force in the collision. The nuclei of the two galaxies are joining to become one giant galaxy.

Ground-based telescopic view of the Antennae galaxies

These interacting galaxies are nearer the Milky Way than previously thought—at 45 million light-years instead of 65 million light-years.[5]

References[change | change source]

  1. R.W. Sinnott, ed. (1988). The complete new general catalogue and index catalogue of nebulae and star clusters by J.L.E. Dreyer. Sky Publishing and Cambridge University Press. ISBN 0-933346-51-4.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 "NASA/IPAC Extragalactic Database". Results for NGC 4038 / 4039. Retrieved 2006-12-07.
  3. Collision between galaxies means they move through each other.
  4. "Corvus". Universe Today. Retrieved 2006-12-07.
  5. "The Antennae galaxies found to be closer to us". Space Daily. 2008-05-12. Archived from the original on 17 May 2008. Retrieved 2008-06-30.