Astronomy:Dwarf spiral galaxy
A dwarf spiral galaxy is the dwarf version of a spiral galaxy. Dwarf galaxies are characterized as having low luminosities, small diameters (less than 5 kpc), low surface brightnesses, and low hydrogen masses.[1] The galaxies may be considered a subclass of low-surface-brightness galaxies.
Dwarf spiral galaxies, particularly the dwarf counterparts of Sa-Sc type spiral galaxies, are quite rare. In contrast, dwarf elliptical galaxies, dwarf irregular galaxies, and the dwarf versions of Magellanic type galaxies (which may be considered transitory between spiral and irregular in terms of morphology) are very common.[1]
It is suggested that dwarf spiral galaxies can transform into dwarf elliptical galaxies, especially in dense cluster environments.[2]
Examples
Location
Most identified dwarf spiral galaxies are located outside clusters.[1] Strong gravitational interactions between galaxies and interactions between galaxies and intracluster gas are expected to destroy the disks of most dwarf spiral galaxies.[1][3] Nonetheless, dwarf galaxies with spiral-like structure have been identified within the Virgo Cluster and Coma Cluster.[3][4][5][6]
References
- ↑ 1.0 1.1 1.2 1.3 J. M. Schombert; R. A. Pildis; J. A. Eder; A. Oelmer, Jr. (1995). "Dwarf Spirals". Astronomical Journal 110: 2067–2074. doi:10.1086/117669. Bibcode: 1995AJ....110.2067S.
- ↑ Ben Moore; Neal Katz; George Lake; Alan Dressler; Augustus Oemler (1 February 1996). "Galaxy harassment and the evolution of clusters of galaxies". Nature 379 (6566): 613–616. doi:10.1038/379613a0. Bibcode: 1996Natur.379..613M.
- ↑ 3.0 3.1 A. W. Graham; H. Jerjen; R. Guzmán (2003). "Hubble Space Telescope Detection of Spiral Structure in Two Coma Cluster Dwarf Galaxies". Astronomical Journal 126 (4): 1787–1793. doi:10.1086/378166. Bibcode: 2003AJ....126.1787G.
- ↑ H. Jerjen; A. Kalnajs; B. Binggeli (2000). "IC3328: A "dwarf elliptical galaxy" with spiral structure". Astronomy and Astrophysics 358: 845–849. Bibcode: 2000A&A...358..845J.
- ↑ F. D. Barazza; B. Binggeli; H. Jerjen (2002). "More evidence for hidden spiral and bar features in bright early-type dwarf galaxies". Astronomy and Astrophysics 391 (3): 823–831. doi:10.1051/0004-6361:20020875. Bibcode: 2002A&A...391..823B.
- ↑ T. Lisker; E. K. Grebel; B. Binggeli (2006). "Virgo Cluster Early-Type Dwarf Galaxies with the Sloan Digital Sky Survey. I. On the Possible Disk Nature of Bright Early-Type Dwarfs". Astronomical Journal 132 (2): 497–513. doi:10.1086/505045. Bibcode: 2006AJ....132..497L.
cs:Spirálová galaxie
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