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Encyclopedia > Canis Major Dwarf Galaxy
Canis Major Dwarf
Observation data: J2000 epoch
Constellation: Canis Major
Right ascension: 07h 12m 35.0s[1]
Declination: -27° 40′ 00″[1]
Redshift:
Distance: 25 kly[citation needed]
Type: Irr
Apparent dimensions (V): 12 degrees × 12 degrees
Apparent magnitude (V):
Notable features: -
Other designations
CMa Dwarf[1]
See also: Galaxy, List of galaxies

The Canis Major Dwarf galaxy is located in the same part of the sky as the constellation of Canis Major. The galaxy contains a relatively high percentage of red giant stars, and is thought to contain an estimated one billion stars in all. The J2000. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... This article does not cite any references or sources. ... Canis Major (IPA: , Latin: ) is one of the 88 modern constellations, and was also in Ptolemys list of 48 constellations. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (abbrev. ... Redshift of spectral lines in the optical spectrum of a supercluster of distant galaxies (right), as compared with that of the Sun (left). ... To help compare distances at different orders of magnitude this page lists lengths from 11,000 light years and 110,000 light years (1020 m and 1021 m). ... A light-year, symbol ly, is the distance light travels in one year: exactly 9. ... 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). ... The angular diameter of an object as seen from a given position is the diameter measured as an angle. ... This article describes the unit of angle. ... The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ... NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 17,000 parsecs in diameter and approximately 20 million parsecs distant. ... List of galaxies: Abell 1835 IR1916 AM 0644-741 Andromeda Galaxy (M31/NGC 224) Andromeda I Andromeda II Andromeda III Aquarius Dwarf Barnards Galaxy (NGC 6822) Black Eye Galaxy (M64/NGC 4826) Bodes Galaxy (M81/NGC 3031) Canis Major Dwarf Galaxy Carina Dwarf Centaurus A Galaxy Draco Dwarf Fornax... This article does not cite any references or sources. ... Canis Major (IPA: , Latin: ) is one of the 88 modern constellations, and was also in Ptolemys list of 48 constellations. ... NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 17,000 parsecs in diameter and approximately 20 million parsecs distant. ... According to the Hertzsprung-Russell diagram, a red giant is a large non-main sequence star of stellar classification K or M; so-named because of the reddish appearance of the cooler giant stars. ... STAR is an acronym for: Organizations Society of Ticket Agents and Retailers], the self-regulatory body for the entertainment ticket industry in the UK. Society for Telescopy, Astronomy, and Radio, a non-profit New Jersey astronomy club. ... One thousand million (1,000,000,000) is the natural number following 999,999,999 and preceding 1,000,000,001. ...


The Canis Major dwarf galaxy is classified as an irregular galaxy and is now thought to be the closest neighbouring galaxy to our location in the Milky Way, being located about 25,000 light-years away from our Solar System and 42,000 light-years from the Galactic Center. It has a roughly elliptical shape and is thought to contain as many stars as the Sagittarius Dwarf Elliptical Galaxy, the previous contender for closest galaxy to our location in the Milky Way. 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. ... This article or section does not adequately cite its references or sources. ... The Milky Way as seen from Death Valley The Milky Way is the galaxy where the Solar System (and the Earth) is located. ... Major features of the Solar System (not to scale; from left to right): Pluto, Neptune, Uranus, Saturn, Jupiter, the asteroid belt, the Sun, Mercury, Venus, Earth and its Moon, and Mars. ... A light-year, symbol ly, is the distance light travels in one year: exactly 9. ... The Galactic Center is the rotational center of the Milky Way galaxy. ... The Sagittarius Dwarf Elliptical Galaxy (Sag DEG) is a satellite galaxy of the Milky Way Galaxy. ...


The galaxy was first discovered in November 2003 by an international team of French, Italian, British and Australian astronomers. Although closer to the Earth than the centre of the galaxy itself, the Canis Major Dwarf galaxy was difficult to detect as it is located behind the plane of the Milky Way, where concentrations of stars, gas and dust are densest. This, along with its small size, explains why it was not discovered sooner. An astronomer or astrophysicist is a person whose area of interest is astronomy or astrophysics. ... This article is about Earth as a planet. ...


The team of astronomers that discovered it were collaborating on analysis of data from the Two-Micron All Sky Survey, a comprehensive survey of the sky in infrared light, which is not blocked by gas and dust as severely as visible light. Because of this technique, scientists were able to detect a very significant over-density of class M giant stars in a part of the sky occupied by the Canis Major constellation, along with several other related structures composed of this type of star, two of which form broad, faint arcs. Observations for the Two Micron All-Sky Survey (2MASS) began in 1997 and were completed in 2001 at two telescopes located one each in the northern and southern hemispheres (Mt. ... Image of two girls in mid-infrared (thermal) light (false-color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ...


Astronomers believe that the Canis Major Dwarf Galaxy is in the process of being pulled apart by the gravitational field of the more massive Milky Way galaxy. The main body of the galaxy is extremely degraded. Tidal disruption causes a long filament of stars to trail behind it as it orbits the Milky Way, forming a complex ringlike structure sometimes referred to as the Monoceros Ring which wraps around our galaxy three times. The stream of stars was first discovered in the early 21st century by astronomers conducting the Sloan Digital Sky Survey. It was in the course of investigating this ring of stars, and a closely spaced group of globular clusters similar to those associated with the Sagittarius Dwarf Elliptical Galaxy, that the Canis Major dwarf galaxy was discovered. The gravitational field is a field (physics), generated by massive objects, that determines the magnitude and direction of gravitation experienced by other massive objects. ... Comet Shoemaker-Levy 9 after breaking up under the influence of Jupiters tidal forces. ... Monoceros Ring is a proposed ring of stars around the Milky Way which consists of stars torn from the Canis Major Dwarf Galaxy as it merges with the Milky Way over the course of billions of years. ... SDSS Logo The Sloan Digital Sky Survey or SDSS is a major multi-filter imaging and spectroscopic redshift survey using a dedicated 2. ... A globular cluster is a spherical bundle of stars (star cluster) that orbits a galaxy as a satellite. ... The Sagittarius Dwarf Elliptical Galaxy (Sag DEG) is a satellite galaxy of the Milky Way Galaxy. ...


Globular clusters thought to be associated with the Canis Major Dwarf galaxy include NGC 1851, NGC 1904, NGC 2298 and NGC 2808, all of which are likely to be a remnant of the galaxy's globular cluster system before its accretion, or swallowing, into the Milky Way. NGC 1261 is another nearby cluster, but its velocity is different enough from that of the others to make its relation to the system unclear. The Canis Major Dwarf galaxy may also have associated open clusters, including Dol 25 and H18, and possibly AM2. It is thought that the open clusters may have formed due to the dwarf galaxy's gravity perturbing material in the galactic disk and stimulating star formation. NGC 1851 is a globular cluster located in the constellation Columba. ... Globular Cluster M79 (also known as Messier Object 79, Messier 79, M79, or NGC 1904) is a globular cluster in the Lepus constellation. ... NGC 2808 is a an globular cluster[1] in the constellation Carina. ... In astrophysics, the term accretion is used for at least two distinct processes. ... The Pleiades is one of the most famous open clusters. ... Sega AM2 is a research and development team for the video game company Sega. ... It has been proposed below that Disc (galaxy) be renamed and moved to galactic disc. ... Media:Example. ...


The discovery of the Canis Major Dwarf Galaxy and subsequent analysis of the stars associated with it has provided some support for the current theory that galaxies may grow in size by swallowing their smaller neighbors. Martin et al. believe that the preponderance of evidence points to the accretion of a small satellite galaxy of the Milky Way which was orbiting roughly in the plane of the galactic disk. A satellite galaxy orbits a larger galaxy, due to gravitational attraction. ... It has been proposed below that Disc (galaxy) be renamed and moved to galactic disc. ...


A new study by Yazan Momany using 2MASS data casts doubts on the nature of the dwarf galaxy. The data suggest that the Canis Major overdensity is actually part of the warped galactic disc. This conclusion, however, is still being challenged and the true nature of the overdensity in Canis Major remains unknown.[citation needed] Observations for the Two Micron All-Sky Survey (2MASS) began in 1997 and were completed in 2001 at two telescopes located one each in the northern and southern hemispheres (Mt. ... Canis Major (IPA: , Latin: ) is one of the 88 modern constellations, and was also in Ptolemys list of 48 constellations. ...


See also

Globular Cluster M79 (also known as Messier Object 79, Messier 79, M79, or NGC 1904) is a globular cluster in the Lepus constellation. ... A small region at the heart of Omega Centauri, containing some 50,000 stars (NASA/STScI) Omega Centauri or NGC 5139 is a globular cluster of stars orbiting our galaxy, the Milky Way. ... In astrophysics, the questions of galaxy formation and evolution are: How, from a homogeneous universe, did we obtain the very heterogeneous one we live in? How did galaxies form? How do galaxies change over time? A spectacular head-on collision between two galaxies is seen in this NASA Hubble Space...

External links

  • Deriving The Shape Of The Galactic Stellar Disc (SkyNightly) Mar 17, 2006

References

  1. ^ a b c NASA/IPAC Extragalactic Database. Results for Canis Major Dwarf. Retrieved on 2007-03-16.

  Results from FactBites:
 
Canis Major Dwarf (494 words)
The authors find that this concentration is the nucleus of a dwarf galaxy which is in a progressive state of disruption, as it orbits our Milky Way Galaxy.
In many respects such as size, orbit and the process of dissolution, the Canis Major Dwarf is similar to SagDEG, which had been discovered in 1994 and taken the place as the nearest known neighbor for nine years.
Some Milky Way globular clusters are loosely grouped around the nucleus of the Canis Major dwarf, and at least some of them may have their origin in the halo of this small galaxy, and may represent the remnant of its former globular cluster system: M79, NGC 1851, NGC 2298, and NGC 2808.
Canis Major Dwarf Galaxy - Wikipedia, the free encyclopedia (704 words)
The Canis Major Dwarf Galaxy is located in the same part of the sky as the constellation of Canis Major.
The Canis Major dwarf galaxy is classified as an irregular galaxy and is now thought to be the closest neighbouring galaxy to the Milky Way, being located only 42,000 light-years from the Galactic Center and approximately 25,000 light-years away from our Solar System.
It is thought that the open clusters may have formed due to the dwarf galaxy's gravity perturbing material in the galactic disk and stimulating star formation.
  More results at FactBites »

 
 

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