NGC 192
| Galaxie NGC 192 | |
|---|---|
 | |
| Aufnahme des Hubble-Weltraumteleskops von NGC 196 (o.r), 197 (Mitte) und 192 (u.l.) | |
| AladinLite | |
| Sternbild | Walfisch |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 00h 39m 13,4s[1] |
| Deklination | +00° 51′ 52″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | (R')SB(r)a: / HII[1] |
| Helligkeit (visuell) | 12,6 mag[2] |
| Helligkeit (B-Band) | 13,5 mag[2] |
| Winkelausdehnung | 1,9′ × 0,9′[2] |
| Positionswinkel | 167°[2] |
| Flächenhelligkeit | 13,0 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | HCG 7, LGG 10[3] |
| Rotverschiebung | 0.013787 ± 0.000008[1] |
| Radialgeschwindigkeit | (4133 ± 2) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (189 ± 13) · 106 Lj (57,9 ± 4,1) Mpc [1] |
| Durchmesser | 105.000 Lj[4] |
| Geschichte | |
| Entdeckung | Wilhelm Herschel |
| Entdeckungsdatum | 28. Dezember 1790 |
| Katalogbezeichnungen | |
| NGC 192 • UGC 401 • PGC 2352 • CGCG 383-051 • MCG +00-02-104 • IRAS 00366+0035 • 2MASX J00391339+0051508 • HCG 7A • GC 96 • H III 872 • h 39 • | |
NGC 192 ist eine Balkenspiralgalaxie vom Hubble-Typ (R')SB(r)a: im Sternbild Walfisch am Himmelsäquator die schätzungsweise 189 Millionen Lichtjahre von der Milchstraße entfernt ist. Gemeinsam mit NGC 196, NGC 197 und NGC 201 bildet sie die Hickson-Kompaktgruppe HCG 7. HCG steht für Hickson Compact Group. Dabei handelt es sich um Ansammlungen von hellen Galaxien, die vergleichsweise isoliert liegen. Man nimmt an, dass die Galaxien der HCG 7 sich nähern und schließlich miteinander verschmelzen werden.[5] Simulationen haben gezeigt, dass diese Galaxien innerhalb von einer Milliarde Jahren eine riesige Galaxie bilden werden.
Das Objekt wurde am 28. Dezember 1790 von dem deutsch-britischen Astronomen Friedrich Wilhelm Herschel entdeckt.[6]
NGC 192-Gruppe (LGG 10)
| Galaxie | Alternativname | Entfernung/Mio. Lj |
|---|---|---|
| NGC 173 | PGC 2223 | 199 |
| NGC 192 | PGC 2352 | 189 |
| NGC 196 | PGC 2357 | 194 |
| NGC 197 | PGC 2365 | 188 |
| NGC 201 | PGC 2388 | 201 |
| NGC 237 | PGC 2597 | 190 |
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Autor/Urheber: ESA/Hubble & NASA, Lizenz: CC BY 3.0
The NASA/ESA Hubble Space Telescope has imaged part of the Hickson Compact Group 7, or HCG 7 for short. This grouping is composed of one lenticular (lens-shaped) and three spiral galaxies in close proximity. In this image, one of the spirals dominates the foreground, with many more distant galaxies peppering the background. Observing tightly-knit galaxy groups like HCG 7 is important because they evolve in a different way from their more spaced-out counterparts in less crowded regions of the Universe.
A recent study using Hubble data analysed the star clusters in HCG 7. Three hundred young clusters and 150 globular clusters were charted, and their ages and distributions measured. The results suggest that the rate of star formation has been fairly steady through time, although quite high in the central regions. Additional studies, including searches for material between the galaxies, hint that the stars in the HCG 7 galaxies formed by converting their gas without any gravitational influences caused by merging with other galaxies. This is puzzling, as the galaxies are depleting their supplies of gas at a rate that suggests that they have merged in the past.
This raises the question of whether the group really has evolved serenely, or if there are mysterious processes at work that are yet to be understood. The currently known information is contradictory and an encouragement for further studies to discover the real story behind HCG 7.
This picture was created from images taken with the Wide Field Channel of the Advanced Camera for Surveys. Images through a blue filter (F435W, coloured blue), yellow-orange (F606W, coloured green) and near-infrared (F814W, coloured red) filters were combined. The total exposure times were 1710 s, 1230 s and 1065 s per filter, respectively, and the field of view is 3.3 x 3.0 arcminutes.