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Encyclopedia > Sagittarius Dwarf Irregular Galaxy
SagDIG. Courtesy of NASA/ESA
Observation data (J2000 epoch)
Constellation Sagittarius
Right ascension 19h 29m 59.0s[1]
Declination -17° 40′ 41″[1]
Redshift -79 ± 1 km/s[1]
Distance 3.39 ± 0.23 Mly (1.04 ± 0.07 Mpc)[2][3]
Type IB(s)m[1] V (Dwarf irregular galaxy)
Apparent dimensions (V) 2′.9 × 2′.1[1]
Apparent magnitude (V) 15.5[1]
Other designations
Sagittarius Dwarf Irregular,[1] SGR Dwarf,[1]
ESO594-G004,[1] PGC 63287,[1] Kowal's Object[1]
See also: Galaxy, List of galaxies
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The Sagittarius Dwarf Irregular Galaxy or SagDIG is a dwarf galaxy in the constellation of Sagittarius. It lies about 3.4 million light-years away. SagDIG should not be confused with the Sagittarius Dwarf Elliptical Galaxy or SagDEG, a satellite galaxy of the Milky Way. It was discovered by Cesarsky et al. on a photographic plate taken for the ESO (B) Atlas on June 13, 1977 using the ESO 1 meter Schmidt telescope. Image File history File links This is a lossless scalable vector image. ... For other uses, see NASA (disambiguation). ... This article is about the European Space Agency. ... The J2000. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... This article is about the star grouping. ... For other uses, see Sagittarius. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (abbrev. ... This article is about the physical phenomenon. ... A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). ... This article is about the unit of time. ... (Redirected from 1 E22 m) Categories: Orders of magnitude (length) ... A light-year, symbol ly, is the distance light travels in one year: exactly 9. ... A parsec is the distance from the Earth to an astronomical object which has a parallax angle of one arcsecond. ... 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. ... 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. ... The Principal Galaxies Catalogue (PGC) is an astronomical catalogue that contains all available primary information for each of the known galaxies: morphological type, major and minor axes, magnitude, radial velocity and position angle. ... For other uses, see Galaxy (disambiguation). ... 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... 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 is about the star grouping. ... For other uses, see Sagittarius. ... A light-year, symbol ly, is the distance light travels in one year: exactly 9. ... The Sagittarius Dwarf Elliptical Galaxy (Sag DEG) is a satellite galaxy of the Milky Way Galaxy. ... A satellite galaxy orbits a larger galaxy, due to gravitational attraction. ... For other uses, see Milky Way (disambiguation). ... Photographic plates were one of the earliest forms of photographic film, in which a light-sensitive emulsion of silver salts was applied to a glass plate. ... is the 164th day of the year (165th in leap years) in the Gregorian calendar. ... Also: 1977 (album) by Ash. ... The European Southern Observatory (ESO) is an international astronomical organisation, composed and supported by ten countries from the European Union plus Switzerland. ...


The SagDIG is the most remote object from the barycenter thought to be a member of the Local Group. It is only slightly outside the zero-velocity surface of the Local Group.[4] In physics, the center of mass of a system of particles is a specific point at which, for many purposes, the systems mass behaves as if it was concentrated. ... A member of the Local Group of galaxies, irregular galaxy Sextans A is 4. ...


SagDIG is a much more luminous galaxy than Aquarius Dwarf and it has been through a prolonged star formation (Momany et al. 2005). This has resulted in it containing a rich intermediate-age population of stars. Twenty-seven candidate carbon stars have been identified inside SagDIG. Analysis shows that the underlying stellar population of SagDIG is metal-poor (at least [Fe/H] ≤ −1.3). Further, the population is young, with the most likely average age between 4 and 8 Gyr for the dominant population.[5] The Aquarius Dwarf galaxy is a dwarf galaxy and an irregular galaxy, that was first catalogued in 1966 by the DDO survey. ... 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. ... Stars observed in our galaxy appear to group into two general types called Population I and Population II. (A hypothetical third group, Population III, does not occur in our galaxy. ... Metal-poor is a term that is used to describe the chemical make up of an astronomical object. ...


References

  1. ^ a b c d e f g h i j k NASA/IPAC Extragalactic Database. Results for Sagittarius Dwarf Irregular. Retrieved on 2007-03-15.
  2. ^ I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127: 2031-2068. 
  3. ^ Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics 49 (1): 3-18. 
  4. ^ van den Bergh, Sidney (April 2000), "Updated Information on the Local Group", The Publications of the Astronomical Society of the Pacific 112 (770): 529-536, <http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2000PASP..112..529V>
  5. ^ Gullieuszik, M.; Rejkuba, M.; Cioni, M. R.; Habing, H. J. & Held, E. V. (November 2007), "Near-infrared photometry of carbon stars in the Sagittarius dwarf irregular galaxy and DDO 210", Astronomy and Astrophysics 475 (2): 467-477, <http://adsabs.harvard.edu/abs/2007A%26A...475..467G>
Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 74th day of the year (75th in leap years) in the Gregorian calendar. ... Sidney van den Bergh (born 1929) is a Canadian astronomer. ...

  Results from FactBites:
 
Sagittarius Dwarf Elliptical Galaxy - Wikipedia, the free encyclopedia (535 words)
Although it is one of the closest companion galaxies to the Milky Way, it is on the opposite side of the galactic core from Earth, and consequently is very faint, although it covers a large area of the sky.
Sag DEG appears to be an older galaxy, with little interstellar dust and composed largely of Population II stars, older and metal-poor compared to the Milky Way.
From its discovery until 2003, it was considered to be the closest outside galaxy to Earth, but since then has been overtaken by the newly discovered Canis Major Dwarf Galaxy.
  More results at FactBites »

 
 

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