Messier 100

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Messier 100, by the European Southern Observatory
Core of Messier 100 taken with the high resolution channel of Hubble's Advanced Camera for Surveys.

Messier 100 (also known as NGC 4321) is an example of a so-called 'grand design' spiral galaxy.[1] It is visible in the southern part of constellation Coma Berenices. Messier 100 is one of the brightest and larguest galaxies in the Virgo cluster, about 55 million light-years away, with a diameter of 160,000 light years.[2] It was discovered by Pierre Méchain in 1781. Later it was entered in Messier’s catalogue of nebulae and star clusters after Charles Messier made observations of his own a month later.[3][4] The galaxy was one of the first spirals discovered,[3] and was listed as one of 14 spiral nebulae by the Earl of Rosse in 1850.

The galaxy has two satellite galaxies, NGC 4323 – connected with M100 by a bridge of luminous matter – and NGC 4328.[5][6]

Star formation[change | change source]

Messier 100 is considered a starburst galaxy with a radius of 1 kilo-parsec, where star formation has been taking place for least 500 million years in separate bursts.[7] Star formation is concentrated in a ring – actually two tightly wound spiral arms attached to a small nuclear bar.[8][9]

As usual on spiral galaxies of the Virgo Cluster, in the rest of the disk both star formation and neutral hydrogen are reduced in the galaxy's disk, something caused by interactions in the Virgo cluster.[10]

References[change | change source]

  1. "Messier 100". SEDS: Spiral Galaxy M100 (NGC 4321), type Sc, in Coma Berenices. Retrieved 2010-02-23. 
  2. "Messier100". Hearst Observatory. Retrieved 2010-02-23. 
  3. 3.0 3.1 "Messier 100". SEDS: Observations and Descriptions. Retrieved 2010-02-23. 
  4. "Catalog of Nebulae and Star Clusters". SEDS. Retrieved 2010-02-23. 
  5. S. di Serego Alighieri et al. (2007). "The HI content of early-type galaxies from the ALFALFA survey I. Catalogued HI sources in the Virgo cluster". Astronomy and Astrophysics 474 (3). doi:10.1051/0004-6361:20078205. 
  6. "NGC 4323". SIMBAD. Retrieved 2010-02-23. 
  7. Wozniak H. et al (1999). "Double-barred starburst galaxies viewed by ISOCAM". The Universe as seen by ISO.: 989. 
  8. Sakamoto, Kazushi et al (1995). "Bar-driven gas structure and star formation in the center of M100". The Astronomical Journal 110 (3): 2075. doi:10.1086/117670. 
  9. Allard E.L. et al (2006). "The star formation history and evolution of the circumnuclear region of M100". Monthly Notices of The Royal Astronomical Society 371 (3): 1087-1105. doi:10.1111/j.1365-2966.2006.10751.x. 
  10. R.A. Koopmann & J.D.P. Kenney (2004). "Hα Morphologies and environmental effects in Virgo Cluster spiral galaxies". Astrophysical Journal 613 (2): 866–885. doi:10.1086/423191.