Die Wagenradgalaxie, beobachtet mit MUSE
Rund 500 Millionen Lichtjahre entfernt ist diese merkwürdig ausschauende Galaxie im Sternbild Sculptor (Bildhauer), die auch als die Wagenrad-Galaxie bekannt ist. Sie war früher einmal eine ganz normale Spiralgalaxie die vor einigen Millionen Jahren frontal mit einer kleineren Begleitergalaxie zusammengestoßen ist, was ihr dieses einmalige Aussehen verliehen hat. Dieses Bild wurde im August 2014 mit dem Multi Unit Spectroscopic Explorer (MUSE) am Very Large Telescope (VLT) der ESO aufgenommen. Ein Vergleich mit diesem Bild, das im Dezember 2021 mit dem New Technology Telescope (NTT) der ESO aufgenommen wurde, zeigt eine Supernova in der unteren linken Ecke.
Dieses Ereignis mit dem Namen SN2021afdx stellt eine Supernova des Typs II dar, die dadurch entsteht, dass ein massereicher Stern das Ende seiner Entwicklung erreicht. Supernovae können einen Stern heller scheinen lassen als seine ganze Heimatgalaxie und können oft monate- oder gar jahrelang sichtbar bleiben – nur ein Wimpernschlag in kosmischen Zeiträumen. Supernovae stellen einen der Gründe dar, warum Astronomen sagen, dass wir aus Sternenstaub bestehen: Sie verstreuen im umliegenden Raum die schweren Element, die zuvor im Stern erbrütet wurden, und die dann später in einer neuen Generation von Sternen, Planeten und möglicherweise Leben auf selbigen enden.
Das Entdecken und die Untersuchung solcher unvorhersehbarer Ereignisse bedarf der internationalen Kooperation. Das erste Mal wurde SN2021afdx im November 2021 im Rahmen des ATLAS-Survey gesichtet, was dann von ePESSTO+ gefolgt wurde, dem „advanced Public ESO Spectroscopic Survey for Transient Objects“. ePESSTO+ wurde zur Untersuchung von Objekten ins Leben gerufen, die nur für kurze Zeit am Nachthimmel sichtbar sind, wie zum Beispiel Supernovae. Dazu werden die Instrumente EFOSC2 und SOFI eingesetzt, beide am NTT am La-Silla-Observatorium der ESO in Chile. EFOSC2 hat nicht nur dieses wunderschöne Bild aufgenommen, sondern auch Spektren, die es dem PESSTO-Team erlaubten, das Ereignis als Supernova des Types II zu identifizieren.
Links
- Vergleichsvideo, das zwischen dem MUSE- und dem NTT-Bild wechselt
- Zwei Bilder zum Vergleich
- Einzelnes NTT-Bild
ESO/Amram et al.
Über das Bild
| ID: | potw2210c |
| Sprache: | de-at |
| Typ: | Beobachtung |
| Veröffentlichungsdatum: | 7. März 2022 06:00 |
| Größe: | 412 x 441 px |
Über das Objekt
| Name: | Cartwheel galaxy |
| Typ: | Early Universe : Star : Evolutionary Stage : Supernova Early Universe : Galaxy : Type : Spiral |
| Entfernung: | 500 Million Lichtjahre |
| Constellation: | Sculptor |
Bildschirm-Hintergrundbilder
Koordinaten
| Position (RA): | 0 37 40.32 |
| Position (Dec): | -33° 42' 52.99" |
| Field of view: | 1.37 x 1.47 arcminutes |
| Orientierung: | Die Nordrichtung liegt -0.0° links zur Vertikale |
Farben & Filter
| Spektralbereich | Wellenlänge | Teleskop |
|---|---|---|
| Optisch B | 435 nm | Very Large Telescope MUSE |
| Optisch V | 550 nm | Very Large Telescope MUSE |
| Optisch R | 625 nm | Very Large Telescope MUSE |
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