Skupina galaxií NGC 5866
Skupina galaxií NGC 5866 | |
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Pozorovací údaje (Ekvinokcium J2000,0) | |
Rektascenze | 15h 10m 42,2s[1] |
Deklinace | +56°9′0″[1] |
Souhvězdí | Drak (Dra) |
Fyzikální charakteristiky | |
Počet galaxií | 3-7[2][3][4][5] |
Nejjasnější galaxie | NGC 5907[2][3] |
Označení v katalozích | |
NGC 5866 Group,[1] NGC 5907 Group,[2] LGG 396,[2] NOGG H 836,[3] NOGG P1 841,[3] NOGG P2 856[3] |
Skupina galaxií NGC 5866 (také známá jako Skupina galaxií NGC 5907) je malá skupina galaxií v souhvězdí Draka.[1] Skupina nese označení podle nejjasnější galaxie této skupiny, kterou je Vřetenová galaxie (M102), ačkoli některé katalogy označují za její nejjasnější galaxii NGC 5907.[2][3][6]
Členové skupiny galaxií NGC 5866
Následující tabulka ukazuje ty členy skupiny galaxií NGC 5866, na kterých se shodují Nearby Galaxies Catalog,[4] výzkum Pascala Fouque a kol.,[5] Lyons Groups of Galaxies (LGG) Catalog,[2] a tři seznamy této skupiny vytvořené při průzkumu Nearby Optical Galaxies.[3]
Název | Typ[7] | R.A. (J2000)[7] | Dec. (J2000)[7] | Rudý posuv (km/s)[7] | Magnituda[7] |
---|---|---|---|---|---|
NGC 5866 | S0 | 15h 06m 29,5s | +55°45′48″ | 672 ± 9 | 10,7 |
NGC 5879 | SA(rs)bc | 15h 09m 46,8s | +57°0′1″ | 772 ± 5 | 12,4 |
NGC 5907 | SA(s)c | 15h 15m 53,8s | +56°19′44″ | 667 ± 3 | 11,1 |
Dalšími možnými členy skupiny (neuváděnými ve všech výše uvedených zdrojích) jsou galaxie NGC 5866B, NGC 5963, UGC 9776 a UGC 9816.
Sousední galaxie
Skupina galaxií NGC 5866 leží severovýchodně od dalších dvou skupin: skupiny galaxií M101, kam patří galaxie Větrník (M101), a skupiny galaxií M51, do které patří Vírová galaxie (M51) a galaxie Slunečnice (M63).[8] Tyto tři skupiny leží v podobné vzdálenosti (podle vzdáleností jednotlivých členů) od naší Galaxie, což naznačuje, že tyto tři skupiny jsou součástí jediné větší volné protáhlé skupiny.[8] Ovšem většina studií, včetně výše uvedených zdrojů, označují tyto skupiny za oddělené celky.
Související články
- Trojice galaxií ve Lvu – podobná malá skupina galaxií
Reference
V tomto článku byl použit překlad textu z článku NGC 5866 Group na anglické Wikipedii.
- ↑ a b c d NASA/IPAC Extragalactic Database: Results for NGC 5866 Group [online]. [cit. 2018-02-08]. Dostupné online. (anglicky)
- ↑ a b c d e f GARCIA, A. General study of group membership. II - Determination of nearby groups. S. 47–90. Astronomy and Astrophysics Supplement [online]. Červenec 1993 [cit. 2018-02-08]. Roč. 100, s. 47–90. Dostupné online. Bibcode:1993A&AS..100...47G. (anglicky)
- ↑ a b c d e f g 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. 2018-02-08]. Roč. 543, čís. 1, s. 178–194. Dostupné online. arXiv:astro-ph/0001140. DOI:10.1086/317070. Bibcode:2000ApJ...543..178G. (anglicky)
- ↑ a b TULLY, R. B. Nearby Galaxies Catalog. Cambridge: Cambridge University Press, 1988. ISBN 0-521-35299-1.
- ↑ a b 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. 2018-02-08]. Roč. 93, čís. 2, s. 211–233. Dostupné online. Bibcode:1992A&AS...93..211F. (anglicky)
- ↑ TULLY, R. B. The Local Supercluster. S. 389–422. Astrophysical Journal [online]. Červen 1982 [cit. 2018-02-08]. Roč. 257, s. 389–422. Dostupné online. DOI:10.1086/159999. Bibcode:1982ApJ...257..389T. (anglicky)
- ↑ a b c d e NASA/IPAC Extragalactic Database: Results for Various Galaxies [online]. [cit. 2018-02-08]. Dostupné online. (anglicky)
- ↑ a b FERRARESE, Laura; FORD, Holland C.; HUCHRA, John, et al. A Database of Cepheid Distance Moduli and Tip of the Red Giant Branch, Globular Cluster Luminosity Function, Planetary Nebula Luminosity Function, and Surface Brightness Fluctuation Data Useful for Distance Determinations. S. 431–459. Astrophysical Journal Supplement [online]. Červen 2000 [cit. 2018-02-08]. Roč. 128, čís. 2, s. 431–459. Dostupné online. arXiv:astro-ph/9910501. DOI:10.1086/313391. Bibcode:2000ApJS..128..431F. (anglicky)
Externí odkazy
- NASA/IPAC Extragalactic Database: Results for NGC 5866 Group [online]. [cit. 2018-02-08]. Dostupné online. (anglicky)
- SIMBAD Astronomical Database: Results for LGG 396 [online]. [cit. 2018-02-08]. Dostupné online. (anglicky)
- FROMMERT, Hartmut. The M102 (NGC 5866) group of galaxies [online]. 2016-12-10 [cit. 2018-02-08]. Dostupné online. (anglicky)
Média použitá na této stránce
From original NASA press release:
- This is a unique view of the disk galaxy NGC 5866 tilted nearly edge-on to our line-of-sight. Hubble's sharp vision reveals a crisp dust lane dividing the galaxy into two halves. The image highlights the galaxy's structure: a subtle, reddish bulge surrounding a bright nucleus, a blue disk of stars running parallel to the dust lane, and a transparent outer halo. NGC 5866 is a disk galaxy of type "S0" (pronounced s-zero). Viewed face on, it would look like a smooth, flat disk with little spiral structure. It remains in the spiral category because of the flatness of the main disk of stars as opposed to the more spherically rotund (or ellipsoidal) class of galaxies called ellipticals. Such S0 galaxies, with disks like spirals and large bulges like ellipticals, are called lenticular galaxies. NGC 5866 lies in the Northern constellation Draco, at a distance of 44 million light-years. It has a diameter of roughly 60,000 light-years only two-thirds the diameter of the Milky Way, although its mass is similar to our galaxy. This Hubble image of NGC 5866 is a combination of blue, green and red observations taken with the Advanced Camera for Surveys in February 2006.
And from the image's page:
- This is a unique NASA Hubble Space Telescope view of the disk galaxy NGC 5866 tilted nearly edge-on to our line-of-sight.
- Hubble's sharp vision reveals a crisp dust lane dividing the galaxy into two halves. The image highlights the galaxy's structure: a subtle, reddish bulge surrounding a bright nucleus, a blue disk of stars running parallel to the dust lane, and a transparent outer halo.
- Some faint, wispy trails of dust can be seen meandering away from the disk of the galaxy out into the bulge and inner halo of the galaxy. The outer halo is dotted with numerous gravitationally bound clusters of nearly a million stars each, known as globular clusters. Background galaxies that are millions to billions of light-years farther away than NGC 5866 are also seen through the halo.
- NGC 5866 is a disk galaxy of type "S0" (pronounced s-zero). Viewed face on, it would look like a smooth, flat disk with little spiral structure. It remains in the spiral category because of the flatness of the main disk of stars as opposed to the more spherically rotund (or ellipsoidal) class of galaxies called "ellipticals." Such S0 galaxies, with disks like spirals and large bulges like ellipticals, are called 'lenticular' galaxies.
- The dust lane is slightly warped compared to the disk of starlight. This warp indicates that NGC 5866 may have undergone a gravitational tidal disturbance in the distant past, by a close encounter with another galaxy. This is plausible because it is the largest member of a small cluster known as the NGC 5866 group of galaxies. The starlight disk in NGC 5866 extends well beyond the dust disk. This means that dust and gas still in the galaxy and potentially available to form stars does not stretch nearly as far out in the disk as it did when most of these stars in the disk were formed.
- The Hubble image shows that NGC 5866 shares another property with the more gas-rich spiral galaxies. Numerous filaments that reach out perpendicular to the disk punctuate the edges of the dust lane. These are short-lived on an astronomical scale, since clouds of dust and gas will lose energy to collisions among themselves and collapse to a thin, flat disk.
- For spiral galaxies, the incidence of these fingers of dust correlates well with indicators of how many stars have been formed recently, as the input of energy from young massive stars moves gas and dust around to create these structures. The thinness of dust lanes in S0s has been discussed in ground-based galaxy atlases, but it took the resolution of Hubble to show that they can have their own smaller fingers and chimneys of dust.
- NGC 5866 lies in the Northern constellation Draco, at a distance of 44 million light-years (13.5 Megaparsecs). It has a diameter of roughly 60,000 light-years (18,400 parsecs) only two-thirds the diameter of the Milky Way, although its mass is similar to our galaxy. This Hubble image of NGC 5866 is a combination of blue, green and red observations taken with the Advanced Camera for Surveys in November 2005.