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Encyclopedia > 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. A dwarf galaxy is a small galaxy composed of up to several billion stars, a small number compared to our own Milky Ways 200-400 billion stars. ... A spiral galaxy is a type of galaxy in the Hubble sequence which is characterized by the following physical properties: Spiral Galaxy M74 presents a face-on view of its spiral arms. ... Luminosity has different meanings in several different fields of science. ... Stellar parallax motion The parsec (symbol pc) is a unit of length used in astronomy. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... A low surface brightness galaxy or LSB galaxy is a diffuse galaxy with a surface brightness that, when viewed from Earth, is at least one magnitude lower than the ambient night sky. ...


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 Sm type galaxies (which may be considered transitory between spiral and irregular in terms of morphology) are very common.[1] Astronomers classify galaxies based on their overall shape (elliptical, spiral or barred spiral) and further by the specific properties of the individual galaxy (for example degree of ellipse, number of spirals or definition of bar). ... Wikipedia does not yet have an article with this exact name. ... Wikipedia does not yet have an article with this exact name. ... Astronomers classify galaxies based on their overall shape (elliptical, spiral or barred spiral) and further by the specific properties of the individual galaxy (for example degree of ellipse, number of spirals or definition of bar). ...


Location

Most identified dwarf spiral galaxies are located outside clusters. Strong gravitational interactions between galaxies and interactions between galaxies and intracluster gas are expected to destroy the disks of most dwarf spiral galaxies.[1][2] Nonetheless, dwarf galaxies with spiral-like structure have been indeitified within the Virgo Cluster and Coma Cluster.[3][4][2][5] Galaxy groups and clusters are super-structures in the spread of galaxies of the cosmos. ... In astronomy, the intracluster medium (or ICM) is the superheated gas present at the center of a galaxy cluster. ... A sky field near some of the brighter galaxies in the Virgo cluster. ... // Coma galaxy cluster The Coma Cluster is an huge galaxy cluster and the prototypical rich cluster with over a thousand member galaxies known. ...


References

  1. ^ a b c J. M. Schombert, R. A. Pildis, J. A. Eder, A. Oelmer, Jr. (1995). "Dwarf Spirals". Astronomical Journal 110: 2067-2074.
  2. ^ a b A. W. Graham, H. Jerjen, R. Guzmán (2003). "Hubble Space Telescope Detection of Spiral Structure in Two Coma Cluster Dwarf Galaxies". Astronomical Journal 126: 1787-1793.
  3. ^ H. Jerjen, A. Kalnajs, B. Binggeli (2000). "IC3328: A "dwarf elliptical galaxy" with spiral structure". Astronomy and Astrophysics 358: 845-849.
  4. ^ 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: 823-831.
  5. ^ 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: 497-513.

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