NGC 2273
| Galaxie NGC 2273 | |
|---|---|
 | |
| Aufnahme mithilfe des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Luchs |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 06h 50m 08,6s[1] |
| Deklination | +60° 50′ 45″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SB(r)a: Sy[1][2] |
| Helligkeit (visuell) | 11,7 mag[2] |
| Helligkeit (B-Band) | 12,6 mag[2] |
| Winkelausdehnung | 3,6′ × 2,0′[2] |
| Positionswinkel | 50°[2] |
| Flächenhelligkeit | 13,8 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | NGC 2273-Gruppe LGG 137[1][3] |
| Rotverschiebung | 0,006138 ± 0,000013[1] |
| Radialgeschwindigkeit | 1840 ± 4 km/s[1] |
| Hubbledistanz vrad / H0 | (86 ± 6) · 106 Lj (26,4 ± 1,8) Mpc [1] |
| Geschichte | |
| Entdeckung | Nils Christofer Dunér |
| Entdeckungsdatum | 15. 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 • LDCE 472 NED002 | |
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.[4] 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
Aufnahme der Ultraviolettstrahlung von NGC 2273 mithilfe des Weltraumteleskops GALEX.
NGC 2273-Gruppe (LGG 137)
| Galaxie | Alternativname | Entfernung/Mio. Lj |
|---|---|---|
| NGC 2273 | PGC 19688 | 86 |
| PGC 19579 | NGC 2273B | 97 |
| PGC 19397 | UGC 3504 | 97 |
Weblinks
- SIMBAD Astronomical Database
- Peter Erwin, Linda S. Sparke: Double bars, inner disks, and nuclear rings in early-type disk galaxies. bibcode:2002AJ....124...65E
Einzelnachweise
Auf dieser Seite verwendete Medien
(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.
NGC 2273 galaxy by GALEX
