Pegasus Dwarf Irregular Galaxy

Pegasus Dwarf Irregular Galaxy
Pegasus Dwarf Irregular Galaxy
Observation data (J2000 epoch)
Constellation Pegasus
Right ascension 23h 28m 36.2s[1]
Declination +14° 44′ 35″[1]
Redshift -183 ± 0 km/s[1]
Distance 3.0 ± 0.1 Mly (920 ± 30 kpc)[2]
Type dIrr/dSph[1][a]
Apparent dimensions (V) 5′.0 × 2′.7[1]
Apparent magnitude (V) 13.2[1]
Other designations
UGC 12613,[1] PGC 71538,[1] DDO 216,[1] Pegasus Dwarf,[1] PegDIG[1]
See also: Galaxy, List of galaxies

The Pegasus Dwarf Irregular Galaxy (also known as Peg DIG or the Pegasus Dwarf) is an irregular galaxy and a dwarf galaxy in the direction of the constellation Pegasus. It was discovered by A.G. Wilson in the 1950s. The Pegasus Dwarf is a companion of the Andromeda Galaxy in the Local Group.

Contents

General information

In 1975 Tully & Fisher determined that it was part of the Local Group.[citation needed] The metallicity and the related distance estimate has been subject to discussions in the scientific literature, with varying results, however, recently, by use of the tip of the red giant branch, a distance within 10% error was achieved in 2000[3][4] and then improved to 3% in 2005.[2]

Location of Pegasus Dwarf in the Local Group.

In popular culture

This galaxy is presumed to be the primary location of the science fiction television series Stargate: Atlantis. While it's mentioned the show takes place in "the Pegasus galaxy" it has not explicitly stated if it is the Irregular or Spheroidal. However, when the Pegasus galaxy has been seen from the Midway station an irregular galaxy is shown. Also, in the discussion regarding the new McKay-Carter Intergalactic Gate Bridge, General Hank Landry states that the distance between the Pegasus and Milky Way galaxies is "three million light-years," suggesting that the series takes place in the Pegasus Dwarf Irregular Galaxy.[5] It is also stated in the pilot by Daniel Jackson that the pegasus galaxy is a dwarf galaxy in the local group, much like the real Pegasus Dwarf Irregular Galaxy.

See also

Notes

  1. ^ NED gives the galaxy classification as both dIrr and dSph, which means that it is a transitory between dwarf irregular and dwarf spheroidal. It is noted as transitory in Cole et al. 1999.[6]

References

  1. ^ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for PegDIG. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=Pegasus+Dwarf#ObjNo1. Retrieved 2007-03-15. 
  2. ^ a b McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. (2005). "Distances and metallicities for 17 Local Group galaxies". Monthly Notices of the Royal Astronomical Society 356 (4): 979–997. arXiv:astro-ph/0410489. Bibcode 2005MNRAS.356..979M. doi:10.1111/j.1365-2966.2004.08514.x. 
  3. ^ Karachentsev, Igor D.; Karachentseva, Valentina E.; Huchtmeier, Walter K.; Makarov, Dmitry I. (2004). "A Catalog of Neighboring Galaxies". The Astronomical Journal 127 (4): 2031–2068. Bibcode 2004AJ....127.2031K. doi:10.1086/382905. 
  4. ^ van den Bergh, Sidney (2000). The Galaxies of the Local Group. Cambridge, UK: Cambridge University Press. ISBN 0521651816. http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2000glg..book.....V. 
  5. ^ "The Return" (Stargate Atlantis)
  6. ^ Cole, Andrew A.; Tolstoy, Eline; Gallagher, John S., III; Hoessel, John G.; Mould, Jeremy R.; Holtzman, Jon A.; Saha, Abhijit; Ballester, Gilda E.; Burrows, Christopher J.; Clarke, John T.; Crisp, David; Griffiths, Richard E.; Grillmair, Carl J.; Hester, Jeff J.; Krist, John E.; Meadows, Vikki; Scowen, Paul A.; Stapelfeldt, Karl R.; Trauger, John T.; Watson, Alan M.; Westphal, James R. (1999). "Stellar Populations at the Center of IC 1613". The Astronomical Journal 118 (4): 1657–1670. arXiv:astro-ph/9905350. Bibcode 1999AJ....118.1657C. doi:10.1086/301042. 

External links

Coordinates: Sky map 23h 28m 36.2s, +14° 44′ 35″


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Pegasus Dwarf Spheroidal Galaxy — Infobox Galaxy name = Pegasus Dwarf Spheroidal Galaxy caption = type = dSphcite journal author=Karachentsev, I. D.; Kashibadze, O. G. title=Masses of the local group and of the M81 group estimated from distortions in the local velocity field… …   Wikipedia

  • Pegasus Galaxy — Pegasus Galaxy, or Pegasus Dwarf Galaxy, or Pegasus Dwarf, can mean several things:* Pegasus Dwarf Irregular Galaxy, or Peg DIG , a member of the Local Group of galaxies * Pegasus Dwarf Spheroidal Galaxy, or Pegasus II , a member of the Local… …   Wikipedia

  • Dwarf galaxy — UGC 9128 is a dwarf irregular galaxy, it probably contains only around one hundred million stars. A dwarf galaxy is a small galaxy composed of up to several billion stars, a small number compared to our own Milky Way s 200 400 billion stars. The… …   Wikipedia

  • Pegasus (disambiguation) — In Greek mythology, Pegasus was a winged horse that was the son of Poseidon.Pegasus may also refer to:Astronomy and Aerospace* Pegasus (constellation), a northern constellation * Pegasus rocket, a winged space booster developed by Orbital… …   Wikipedia

  • Pegasus-Zwerggalaxie — Als Pegasus Zwerggalaxie werden zwei unterschiedliche Zwerggalaxien am Rand der Lokalen Gruppe bezeichnet. Peg dSph Die spheroide Pegasus Zwerggalaxie (auch Peg dSph, für Pegasus Dwarf Spheroidal Galaxy) wird auch als Pegasus II, Andromeda VI… …   Deutsch Wikipedia

  • Irreguläre Pegasus-Zwerggalaxie — Als Pegasus Zwerggalaxie werden zwei unterschiedliche Zwerggalaxien in der Lokalen Gruppe bezeichnet. Peg dSph Die spheroide Pegasus Zwerggalaxie (auch Peg dSph, für Pegasus Dwarf Spheroidal Galaxy) wird auch als Pegasus II, Andromeda VI oder KKH …   Deutsch Wikipedia

  • Low surface brightness galaxy — 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.Most LSBs are dwarf galaxies, in which most of their baryonic… …   Wikipedia

  • Mythology of Stargate — In the fictional universe of the Stargate franchise, the people of Earth have encountered numerous extraterrestrial races on their travels through the Stargate. In addition to a diversity of alien life, there is also an abundance of other humans …   Wikipedia

  • Список ближайших галактик — Ниже приводится список известных галактик в пределах 3,6 мегапарсек (11,7 млн световых лет) от Земли в порядке удалённости от Земли (см. примечание ниже). 3,6 Мпк  это расстояние до центра ближайших двух больших групп галактик: Группы… …   Википедия

  • Карликовая галактика — Карликовая неправильная галактика в Стрельце (SagDIG) Карликовая галактика  небольшая галактика, состоящая из нескольких миллиардов звёзд (что очень мало по сравнению, например, с нашей галактикой, насчитывающей около 200 400 миллиардов …   Википедия

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”