IC 298
| Galaxie IC 298 | |
|---|---|
 | |
| Das Galaxienpaar IC 298 aufgenommen vom Hubble-Weltraumteleskop | |
| AladinLite | |
| Sternbild | Walfisch |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 03h 11m 18,9s[1] |
| Deklination | +01° 18′ 53″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | A: S pec (Ring B) B: S0? pec (Ring A)[1] |
| Helligkeit (visuell) | A: 14,8 mag B: 14,9 mag[2] |
| Helligkeit (B-Band) | A: 15,8 mag B: 15,5 mag[2] |
| Winkelausdehnung | A: 0,45' × 0,35' B: 0,3' × 0,1'[2] |
| Positionswinkel | A: 126° B: 5°[2] |
| Flächenhelligkeit | A: 14,0 mag/arcmin² B: 12,6 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0,032209 ± 0,000060[1] |
| Radialgeschwindigkeit | (9656 ± 1) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (431 ± 30) · 106 Lj (132,2 ± 9,3) Mpc [1] |
| Durchmesser | 55.000 + 40.000 Lj[3] |
| Geschichte | |
| Entdeckung | Stéphane Javelle |
| Entdeckungsdatum | 29. Dezember 1893 |
| Katalogbezeichnungen | |
| IC 298/298A • PGC 11890/3 • CGCG 390-016 • MCG +0-9-15&6 • IRAS 03087+0107 • 2MASX J03111863+0118498 • Arp 147 • VV 787 • I Zw 11 | |
IC 298 (auch bekannt als Arp 147) ist ein Galaxienpaar im Sternbild Walfisch, das etwa 431 Millionen Lichtjahre von der Milchstraße entfernt ist. Ein Teil von IC 298 ist eine der seltenen Ringgalaxien, welche durch den Zusammenstoß dieser beiden Galaxien entstanden ist. Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Diese Galaxie gehört zu der Klasse Galaxien mit assoziierten Ringen.
Das Galaxienpaar IC 298 wurde am 29. Dezember 1893 von dem französischen Astronomen Stéphane Javelle entdeckt.[4]
Weblinks
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
Auf dieser Seite verwendete Medien
NASA's Hubble Space Telescope is back in business.
Just a couple of days after the orbiting observatory was brought back online, Hubble aimed its prime working camera, the Wide Field Planetary Camera 2 (WFPC2), at a particularly intriguing target, a pair of gravitationally interacting galaxies called Arp 147.
The image demonstrated that the camera is working exactly as it was before going offline, thereby scoring a "perfect 10" both for performance and beauty.
The two galaxies happen to be oriented so that they appear to mark the number 10. The left-most galaxy, or the "one" in this image, is relatively undisturbed apart from a smooth ring of starlight. It appears nearly on edge to our line of sight. The right-most galaxy, resembling a zero, exhibits a clumpy, blue ring of intense star formation.
The blue ring was most probably formed after the galaxy on the left passed through the galaxy on the right. Just as a pebble thrown into a pond creates an outwardly moving circular wave, a propagating density wave was generated at the point of impact and spread outward. As this density wave collided with material in the target galaxy that was moving inward due to the gravitational pull of the two galaxies, shocks and dense gas were produced, stimulating star formation.
The dusty reddish knot at the lower left of the blue ring probably marks the location of the original nucleus of the galaxy that was hit.
Arp 147 appears in the Arp Atlas of Peculiar Galaxies, compiled by Halton Arp in the 1960s and published in 1966. This picture was assembled from WFPC2 images taken with three separate filters. The blue, visible-light, and infrared filters are represented by the colors blue, green, and red, respectively.
The galaxy pair was photographed on October 27-28, 2008. Arp 147 lies in the constellation Cetus, and it is more than 400 million light-years away from Earth.