Arp 273
| Galaxie Arp 273 | |
|---|---|
.jpg) | |
| Aufnahme mit dem Hubble Space Telescope | |
| AladinLite | |
| Sternbild | Andromeda |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 02h 21m 30,6s[1] |
| Deklination | +39° 21′ 58″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SA(s)b pec SB(s)a pec[1] |
| Helligkeit (visuell) | 13,4 mag 15,1 mag[1] |
| Winkelausdehnung | 2' × 1,3' 1,5' × 0,4' |
| Physikalische Daten | |
| Zugehörigkeit | Abell 347[1] |
| Rotverschiebung | 0,025227 ± 0,000037[1] |
| Radialgeschwindigkeit | (7563 ± 11) km/s[1] |
| Hubbledistanz vrad / H0 | (343 ± 24) · 106 Lj (105,3 ± 7,4) Mpc [1] |
| Geschichte | |
| Katalogbezeichnungen | |
| UGC 1810/1813 • PGC 8961/8970 • CGCG 523-028/029 • MCG +6-6-23/24 • 2MASX J02212870+3922326, J02213261+3921246 • Arp 273 • VV 323 • KPG 64 | |
Arp 273 ist ein interagierendes Galaxienpaar im Sternbild Andromeda, welche schätzungsweise 340 Millionen Lichtjahre entfernt ist.
Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Dieses Galaxienpaar gehört zu der Klasse Doppelgalaxien mit verbundenen Armen.[2] Die größere der beiden Spiralgalaxien, UGC 1810, hat etwa fünfmal so viel Masse wie die kleinere.[3] Die kleinere Galaxie, UGC 1813, zeigt deutliche Anzeichen von aktiver Sternentstehung in ihrem Kern und hat wahrscheinlich die größere kürzlich durchquert.[4]
Weblinks
- astronews.com: Galaktische Rose zum 21. Geburtstag 21. April 2011
- Spektrum.de: Amateuraufnahmen [1]
- Arp Atlas of Peculiar Galaxies
- Seligman Arp
Literatur
- Jeff Kanipe und Dennis Webb: The Arp Atlas of Peculiar Galaxies – A Chronicle and Observer´s Guide, Richmond 2006, ISBN 978-0-943396-76-7
Einzelnachweise
- ↑ a b c d e f NASA/IPAC EXTRAGALACTIC DATABASE
- ↑ Interacting galaxies Arp 273. National Optical Astronomy Observatory. Archiviert vom Original am 24. April 2011. Info: Der Archivlink wurde automatisch eingesetzt und noch nicht geprüft. Bitte prüfe Original- und Archivlink gemäß Anleitung und entferne dann diesen Hinweis. Abgerufen am 21. April 2011.
- ↑ Oli Usher, Ray Villard: A galactic rose highlights Hubble's 21st anniversary. 20. April 2011. Abgerufen am 27. Oktober 2020.
- ↑ FlugRevue Juli 2011, S. 74, Eine Rose zu Hubbles Jahrestag
Auf dieser Seite verwendete Medien
This Hubble Space Telescope image shows a group of interacting galaxies called Arp 273. The larger of the spiral galaxies, known as UGC 1810, has a disk that is tidally distorted into a rose-like shape by the gravitational tidal pull of the companion galaxy below it, known as UGC 1813. A swath of blue jewels across the top is the combined light from clusters of intensely bright and hot young blue stars. These massive stars glow fiercely in ultraviolet light.
The smaller, nearly edge-on companion shows distinct signs of intense star formation at its nucleus, perhaps triggered by the encounter with the companion galaxy.
A series of uncommon spiral patterns in the large galaxy is a tell-tale sign of interaction. The large, outer arm appears partially as a ring, a feature seen when interacting galaxies actually pass through one another. This suggests that the smaller companion actually dived deep, but off-center, through UGC 1810. The inner set of spiral arms is highly warped out of the plane with one of the arms going behind the bulge and coming back out the other side. How these two spiral patterns connect is still not precisely known.
A possible mini-spiral may be visible in the spiral arms of UGC 1810 to the upper right. It is noticeable how the outermost spiral arm changes character as it passes this third galaxy, from smooth with lots of old stars (reddish in color) on one side to clumpy and extremely blue on the other. The fairly regular spacing of the blue star-forming knots fits with what is seen in the spiral arms of other galaxies and is predictable based on instabilities in the gas contained within the arm.
The larger galaxy in the UGC 1810 - UGC 1813 pair has a mass that is about five times that of the smaller galaxy. In unequal pairs such as this, the relatively rapid passage of a companion galaxy produces the lopsided or asymmetric structure in the main spiral. Also in such encounters, the starburst activity typically begins in the minor galaxies earlier than in the major galaxies. These effects could be due to the fact that the smaller galaxies have consumed less of the gas present in their nucleus, from which new stars are born.
Arp 273 lies in the constellation Andromeda and is roughly 300 million light-years away from Earth. The image shows a tenuous tidal bridge of material between the two galaxies that are separated by tens of thousands of light-years from each other.
The interaction was imaged on December 17, 2010, with Hubble's Wide Field Camera 3 (WFC3).
This Hubble image is a composite of data taken with three separate filters on WFC3 that allow a broad range of wavelengths covering the ultraviolet, blue, and red portions of the spectrum.