Skupina galaxií Velká medvědice

Skupina galaxií Velká medvědice
Mapa skupiny galaxií Velká medvědice
Mapa skupiny galaxií Velká medvědice
Pozorovací údaje
(Ekvinokcium J2000,0)
Rektascenze11h 57m 11,1s[1]
Deklinace+49°17′18″[1]
SouhvězdíVelká medvědice[2] (UMa)
Vzdálenost55 M [3][4] ly
Fyzikální charakteristiky
Počet galaxií60[4][3]
Nejjasnější galaxieM109[2]
Označení v katalozích
Ursa Major Cluster,[1] LGG 250,[2] LGG 258,[2] LGG 269,[2] UMa N,[2] UMa S,[2] UMa I N,[5] UMa I S,[5] NOGG H 574[6]

Skupina galaxií Velká medvědice (anglicky Ursa Major Cluster) je bohatá skupina galaxiísouhvězdí Velké medvědice,[4] která je součástí Místní nadkupy galaxií. Od Země je vzdálená přibližně 55 milionů světelných let[3][4] a převážnou většinu v této skupině tvoří spirální galaxie.[4][3] Na obloze má tato oblast rozměry asi 20° × 10°.[4]

Některé zdroje tuto skupinu rozdělují na dvě podskupiny označované jako UMa N (severní Velká medvědice) a UMa S (jižní Velká medvědice).[2][5] Nejjasnějšími členy severní podskupiny jsou NGC 3631, NGC 3953Messier 109 (tato podskupina se někdy značí jako skupina galaxií M 109), v jižní podskupině vystupují NGC 3726, NGC 3938NGC 4051. Severní podskupina zahrnuje přibližně 32 velkých galaxií a jižní skupina asi 28,[3] celkem tedy 60 velkých a několik stovek malých galaxií.[4]

Na jihovýchodě s jižní podskupinou sousedí skupina Honicích psů II, která leží trochu blíže k Zemi než skupina galaxií Velká medvědice.[3]

Galerie obrázků

Reference

V tomto článku byly použity překlady textů z článků Ursa Major Cluster na anglické Wikipedii a Ammasso dell'Orsa Maggiore na italské Wikipedii.

  1. a b c NASA/IPAC Extragalactic Database: Results for Ursa Major Cluster [online]. [cit. 2018-01-26]. Dostupné online. (anglicky) 
  2. a b c d e f g h GARCIA, A. General study of group membership. II - Determination of nearby groups. S. 47–90. Astronomy and Astrophysics Supplement [online]. Červenec 1993 [cit. 2018-01-26]. Roč. 100, s. 47–90. Dostupné online. Bibcode 1993A&AS..100...47G. (anglicky) 
  3. a b c d e f POWELL, Richard. Atlas of the Universe: The Ursa Major Groups [online]. [cit. 2018-01-26]. Dostupné online. (anglicky) 
  4. a b c d e f g KODRIŠ, Michal. Průvodce hvězdnou oblohou: Velká medvědice [online]. [cit. 2018-01-26]. Dostupné online. 
  5. a b c FOUQUE, P.; GOURGOULHON, E.; CHAMARAUX, P., et al. Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members. S. 211–233. Astronomy and Astrophysics Supplement [online]. Květen 1992 [cit. 2018-01-26]. Roč. 93, čís. 2, s. 211–233. Dostupné online. Bibcode 1992A&AS...93..211F. (anglicky) 
  6. GIURICIN, Giuliano; MARINONI, Christian; CERIANI, Lorenzo, et al. Nearby Optical Galaxies: Selection of the Sample and Identification of Groups. S. 178–194. Astrophysical Journal [online]. Listopad 2000 [cit. 2018-01-26]. Roč. 543, čís. 1, s. 178–194. Dostupné online. arXiv astro-ph/0001140. DOI 10.1086/317070. Bibcode 2000ApJ...543..178G. (anglicky) 

Externí odkazy

  • NASA/IPAC Extragalactic Database: Results for Ursa Major Cluster [online]. [cit. 2018-01-26]. Dostupné online. (anglicky) 
  • SIMBAD Astronomical Database: Results for Ursa Major Cluster [online]. [cit. 2018-01-26]. Dostupné online. (anglicky) 
  • POWELL, Richard. Atlas of the Universe: The Ursa Major Groups [online]. [cit. 2018-01-26]. Dostupné online. (anglicky) 
  • FROMMERT, Hartmut. The Ursa Major Cloud of Galaxies [online]. 2006-11-23 [cit. 2018-01-26]. Dostupné online. (anglicky) 
  • KODRIŠ, Michal. Průvodce hvězdnou oblohou: Velká medvědice [online]. [cit. 2018-01-26]. Dostupné online. 

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