Flocculent spiral galaxy

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NGC 2841, the prototypical flocculent spiral galaxy

A flocculent spiral galaxy is a type of spiral galaxy. Unlike the well-defined spiral architecture of a grand design spiral galaxy, flocculent (meaning "fluffy") galaxies are patchy, with discontinuous spiral arms.[1][2] Self-propagating star formation is the apparent explanation for the structure of flocculent spirals.[3] Approximately 30% of spirals are flocculent, 10% are grand design, and the rest are referred to as "multi-armed".[4] The multiple-arm type is sometimes grouped into the flocculent category.[5]

The prototypical flocculent spiral is NGC 2841.[6]

Examples[edit]

Example Class Image Constellation Notes
NGC 4414 SA(rs)c NGC 4414 (NASA-med).jpg Coma Berenices [7]
NGC 2841 SA(r)b NGC 2841 Hubble WikiSky.jpg Ursa Major [6]
NGC 3521 SAB(rs)bc NGC3521-eso1129a.jpg Leo [6]
NGC 7793 SA(s)d Phot-14b-09-fullres 2.JPG Sculptor [6]
Sunflower Galaxy
(Messier 63)
SAB(rs)cd M63 (NGC 5055).jpg Canes Venatici [8]

References[edit]

  1. ^ COSMOS - SAO Encyclopedia of Astronomy, "Grand Design Spiral" (accessed 23 April 2010)
  2. ^ COSMOS - SAO Encyclopedia of Astronomy, "Flocculent Spiral" (accessed 23 April 2010)
  3. ^ Masters, Karen (September 2002), What is the Origin of Spiral Structure in Galaxies, archived from the original on 2007-06-09, retrieved 2007-05-30 
  4. ^ Case Western Reserve University, Chris Mihos, ASTR222 - Spring 2008, "Spiral Structure" (accessed 23 April 2010)
  5. ^ University of Virginia, Mark Whittle, ASTR 553/554 : Extragalactic Astronomy (2007), "Lecture 5: Spiral Galaxies" (accessed 23 April 2010)
  6. ^ a b c d "A Near-Infrared Atlas of Spiral Galaxies", Debra Meloy Elmegreen, "CH3. Discussion" (accessed 23 April 2010)
  7. ^ Nemiroff, R.; Bonnell, J., eds. (3 April 2002). "NGC 4414: A Flocculent Spiral Galaxy". Astronomy Picture of the Day. NASA. Retrieved 23 April 2010. 
  8. ^ NASA (2015). [1]. Retrieved Mar. 2, 2017

Sources[edit]

External links[edit]