NGC 2273

Galaxie
NGC 2273
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(c) ESA/Hubble, CC BY 4.0
Aufnahme mithilfe des Hubble-Weltraumteleskops
AladinLite
SternbildLuchs
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension06h 50m 08,6s[1]
Deklination+60° 50′ 45″[1]
Erscheinungsbild
Morphologischer TypSB(r)a: Sy[1]
Helligkeit (visuell)11,7 mag[2]
Helligkeit (B-Band)12,6 mag[2]
Winkel­ausdehnung3,6′ × 2,0′[2]
Positionswinkel50°[2]
Flächen­helligkeit13,8 mag/arcmin²[2]
Physikalische Daten
ZugehörigkeitNGC 2273-Gruppe
LGG 137
LDCE 472[1][3]
Rotverschiebung0,006138 ± 0,000013[1]
Radial­geschwin­digkeit(1840 ± 4) km/s[1]
Hubbledistanz
H0 = 73 km/(s • Mpc)		(86 ± 6) · 106 Lj
(26,4 ± 1,8) Mpc [1]
Durchmesser90.000 Lj[4]
Geschichte
EntdeckungNils Christofer Dunér
Entdeckungsdatum15. September 1867
Katalogbezeichnungen
NGC 2273 • UGC 3546 • PGC 19688 • CGCG 285-006 • MCG +10-10-015 • IRAS 06456+6054 • 2MASX J06500866+6050445 • Mrk 620 • NVSS J065008+605044 •

NGC 2273 ist eine Balken-Spiralgalaxie mit aktivem Galaxienkern vom Hubble-Typ SBbc im Sternbild Luchs am Nordsternhimmel. Sie ist schätzungsweise 86 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 90.000 Lichtjahren. Gemeinsam mit PGC 19397 und PGC 19579 bildet sie die kleine NGC 2273-Gruppe.

Das Objekt am 15. September 1867 von dem Astronomen Nils Christofer Dunér mit einem 24-cm-Teleskop entdeckt.[5] Untersuchungen mit dem Hubble-Weltraumteleskop und dem WIYN Telescope zeigen eine spektakuläre Gestalt:

„This is a rather spectacular four-ringed spiral galaxy, with two outer rings, an inner ring, and a bright star-forming nuclear ring with a luminous blue nuclear spiral inside. The latter structure masquerades as a secondary bar in ellipse fits and ground-based images.“

Galerie

NGC 2273-Gruppe (LGG 137)

GalaxieAlternativnameEntfernung/Mio. Lj
NGC 2273PGC 1968886
PGC 19579NGC 2273B97
PGC 19397UGC 350497

Weblinks

Commons: NGC 2273 – Sammlung von Bildern, Videos und Audiodateien

Einzelnachweise

  1. ↑ a b c d e NASA/IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS: NGC 2273
  3. ↑ VizieR
  4. ↑ NASA/IPAC
  5. ↑ Seligman

Auf dieser Seite verwendete Medien

NGC2273 - HST - Potw2014a.tif
(c) ESA/Hubble, CC BY 4.0

Rings Upon Rings

At first glance, the subject of this NASA/ESA Hubble Space Telescope image looks to be a simple spiral galaxy, with two pinwheeling arms emerging from a central bar of stars and material that cuts through the galactic centre. In fact, there are rings within these spiral arms, too: spirals within a spiral.

This kind of morphology is known as a multiring structure. As this description suggests, this galaxy, named NGC 2273, hosts an inner ring and two outer “pseudorings” — having so many distinct rings is rare, and makes NGC 2273 unusual. Rings are created when a galaxy’s spiral arms appear to loop around to nearly close upon one another, combined with a trick of cosmic perspective. NGC 2273’s two pseudorings are formed by two swirling sets of spiral arms coming together, and the inner ring by two arcing structures nearer to the galactic centre, which seem to connect in a similar way.

These rings are not the only unique feature of this galaxy. NGC 2273 is also a Seyfert galaxy, a galaxy with an extremely luminous core. In fact, the centre of a galaxy such as this is powered by a supermassive black hole, and can glow brightly enough to outshine an entire galaxy like the Milky Way.

Credit:

ESA/Hubble & NASA, J. Greene 


Coordinates
Position (RA): 	6 50 8.02
Position (Dec):	60° 51' 3.26"
Field of view: 	2.59 x 2.01 arcminutes
Orientation:   	North is 6.8° left of vertical

Colours & filters Band	Wavelength	Telescope 
Optical B      	438 nm  	Hubble Space Telescope WFC3
Optical U      	336 nm  	Hubble Space Telescope WFC3
Optical I       	814 nm  	Hubble Space Telescope WFC3
Optical SII    	673 nm  	Hubble Space Telescope WFC3
Infrared H     	1.6 μm  	Hubble Space Telescope WFC3
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NGC 2273 GALEX WikiSky.jpg
NGC 2273 galaxy by GALEX