NGC 2146
| Galaxie NGC 2146 | |
|---|---|
.jpg) | |
| Aufnahme mithilfe des Mayall Telescope | |
| AladinLite | |
| Sternbild | Giraffe |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 6h 18m 37,7s[1] |
| Deklination | +78° 21′ 25″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SB(s)ab/p / HII / LIRG[1] |
| Helligkeit (visuell) | 10,5 mag[2] |
| Helligkeit (B-Band) | 11,3 mag[2] |
| Winkelausdehnung | 5,4′ × 2,9′[1] |
| Positionswinkel | 56°[2] |
| Flächenhelligkeit | 13,3 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0,002975 ± 0,000013[1] |
| Radialgeschwindigkeit | (892 ± 4) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (46 ± 3) · 106 Lj (14,2 ± 1,0) Mpc [1] |
| Durchmesser | 70.000 Lj[3] |
| Geschichte | |
| Entdeckung | Friedrich Winnecke |
| Entdeckungsdatum | 1876 |
| Katalogbezeichnungen | |
| NGC 2146 • UGC 3429 • PGC 18797 • CGCG 348-017 • MCG +13-05-022 • IRAS 06106+7822 • 2MASX J06183771+7821252 • VV 1156 • GC 5357 • NVSS J061837+782123 • KPG 110A | |
NGC 2146 ist eine aktive Balken-Spiralgalaxie mit ausgedehnten Sternentstehungsgebieten vom Hubble-Typ SBab/P im Sternbild Giraffe am Nordsternhimmel. Sie ist rund 46 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 75.000 Lichtjahren. Gemeinsam mit PGC 18960 (auch NGC 2146A) bildet sie das optische Galaxienpaar KPG 110.
Die Galaxie zeigt starke Deformierungen und eine erhöhte Sternentstehungsrate, was auf eine enge Begegnung mit einer Begleitgalaxie hindeutet. Jedoch ist die auf den ersten Blick in Frage kommende Spiralgalaxie NGC 2146A, viel zu weit entfernt und wohl eher ein zufällig im Hintergrund stehendes Objekt. Vermutlich hat NGC 2146 ihren früheren Begleiter schon lange vollständig in sich aufgenommen.[4][5]
Die Supernovae SN 2005V (Typ Ib/c) und SN 2018zd (Typ II) wurden hier beobachtet.[6]
Aufnahme des Zentrums, Hubble-Weltraumteleskop
Ultraviolett-Strahlung von NGC 2146, aufgenommen von GALEX
Das Objekt wurde im Jahre 1876 von dem deutschen Astronomen Friedrich August Theodor Winnecke entdeckt.[7]
Literatur
- König, Michael & Binnewies, Stefan (2019): Bildatlas der Galaxien: Die Astrophysik hinter den Astrofotografien, Stuttgart: Kosmos, S. 224
Weblinks
- CDS Portal
- Feeling the strain (engl.)
- astronews.com: Bild des Tages 22. August 2011
- SIMBAD Astronomical Database
Einzelnachweise
Auf dieser Seite verwendete Medien
NGC 2146
Autor/Urheber:
Credit:
T.A. Rector (University of Alaska Anchorage) and H. Schweiker (WIYN and NOIRLab/NSF/AURA), Lizenz: CC BY 4.0Peculiar Barred Spiral Galaxy NGC 2146
This image was obtained with the wide-field view of the Mosaic camera on the Mayall 4-meter telescope at Kitt Peak National Observatory. NGC 2146, the large galaxy in the lower-right corner of the image, is classified as a peculiar barred spiral. It is also considered to be a starburst galaxy because stars are forming inside it at a rapid rate. NGC 2146 is likely two galaxies that collided and are near the end of the process of merging. The smaller galaxy in the upper-left corner, NGC 2146A, is likely a companion galaxy. Its role in the star-formation or merger history of NGC 2146 is unclear. The image was generated with observations in the B (blue), V (green), I (orange) and Hydrogen-Alpha (red) filters. In this image, North is up, East is to the left.
Credit:
T.A. Rector (University of Alaska Anchorage) and H. Schweiker (WIYN and NOIRLab/NSF/AURA)
Autor/Urheber: ESA/Hubble & NASA, Lizenz: CC BY 3.0
A galaxy being stretched out of shape has been imaged by the NASA/ESA Hubble Space Telescope. Known as NGC 2146, it has been severely warped and deformed so that an immense dusty arm of glittering material now lies directly in front of the centre of the galaxy, as seen in the image.
NGC 2146 is classified as a barred spiral due to its shape, but the most distinctive feature is the dusty spiral arm that has looped in front of the galaxy's core as seen from our perspective. The forces required to pull this structure out of its natural shape and twist it up to 45 degrees are colossal. The most likely explanation is that a neighbouring galaxy is gravitationally perturbing it and distorting the orbits of many of NGC 2146’s stars. It is probable that we are currently witnessing the end stages of a process which has been occurring for tens of millions of years.
NGC 2146 is undergoing intense bouts of star formation, to such an extent that it is referred to as a starburst galaxy. This is a common state for barred spirals, but the extra gravitational disruption that NGC 2146 is enduring no doubt exacerbates the situation, compressing hydrogen-rich nebulae and triggering stellar birth.
Measuring about 80 000 light-years from end to end, NGC 2146 is slightly smaller than the Milky Way. It lies approximately 70 million light-years distant in the faint northern constellation of Camelopardalis (The Giraffe). Although it is fairly easy to see with a moderate-sized telescope as a faint elongated blur of light it was not spotted until 1876 when the German astronomer Friedrich Winnecke found it visually using just a 16 cm telescope.
This picture was created from images taken with the Wide Field Channel of Hubble’s Advanced Camera for Surveys. Images through a near-infrared filter (F814W, coloured blue and orange/brown) were combined with images taken in a filter that isolates the glow from hydrogen gas (F658N, coloured red). An additional green colour channel was also created by combining the two to help to create a realistic colour rendition for the final picture from this unusual filter combination. The total exposure times were 120 s and 700 s respectively and the field of view is covers 2.6 x 1.6 arcminutes.