Flocculent spiral galaxy

Summary

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]

NGC 2775, a prominent flocculent spiral galaxy

The prototypical flocculent spiral is NGC 2841.[6]

List of flocculent spiral galaxiesEdit

Example Class Image Constellation Notes
NGC 1325 SBbc   Eridanus
NGC 1353 SBb   Eridanus
NGC 2775 SA(r)ab   Cancer [7]
NGC 2841 SA(r)b   Ursa Major [6]
NGC 3521 SAB(rs)bc   Leo [6]
NGC 4298 SA(rs)c   Coma Berenices
NGC 4414 SA(rs)c   Coma Berenices [8]
NGC 7793 SA(s)d   Sculptor [6]
Sunflower Galaxy
(Messier 63)
SAB(rs)cd   Canes Venatici [9]

ReferencesEdit

  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 9 June 2007, retrieved 30 May 2007
  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" Archived 7 July 2010 at the Wayback Machine (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. ^ "Hubble Spots Feathered Spiral". NASA. 2 July 2020. Retrieved 3 July 2020.
  8. ^ Nemiroff, R.; Bonnell, J., eds. (3 April 2002). "NGC 4414: A Flocculent Spiral Galaxy". Astronomy Picture of the Day. NASA. Retrieved 23 April 2010.
  9. ^ NASA (2015). [1]. Retrieved Mar. 2, 2017

SourcesEdit

  • PDF A Near-Infrared Atlas of Spiral Galaxies, Debra Meloy Elmegreen, 1981, doi:10.1086/190757, Bibcode:1981ApJS...47..229E

External linksEdit

  • COSMOS astronomy encyclopedia - Flocculent Spiral