Lysguirlander og perler
Ugens billede viser flotte bånd af gasarter og støv, som snor sig omkring perlemorsskæret i centeret af bjælkespiralgalaksen NGC 1398. Galaksen befinder sig i stjernebilledet Fornax (Den kemiske Ovn), og er omkring 65 millioner lysår borte.
De yndefulde spiralarme starter fra en lige bjælke, som er består af stjerner, og som skærer lige igennem galaksens centralområder. I mange andre galakser end NGC 1938 starter spiralarmene helt inde fra centeret, men ikke her. Omkring to tredjedele af spiralgalakserne har bjælker, men forskerne er ikke klar over hvordan disse strukturer påvirker galaksens opførsel og udvikling - om overhovedet.
Data til billedet stammer fra FOcal Reducer/low dispersion Spectrograph 2 (FORS2) instrumentet, som er monteret på ESOs Very Large Telescope (VLT) ved Paranalobservatoriet i Chile. Det viser masser af detaljer, såsom de mørke bånd at støv, som slynger sig i spiralarmene og de pink områder rundt omkring i de ydre dele, hvor der sker stjernedannelse.
Billedet er en del af ESOs Cosmic Gems programme, hvis formål det er, at skabe billeder som er interessante, forundringsværdige eller bare simpelthen flotte. ESOs teleskoper bliver brugt også til uddannelse og til formidling i de perioder, hvor de ikke kan bruges til videnskabelige observationer. De data, som indhøstes kan måske også bruges videnskabeligt, og de er tilgængelige for forskerne via ESOs videnskabelige arkiver.
Kilde:ESO
Om billedet
| Id: | potw1801a |
| Sprog: | da |
| Type: | Observation |
| Udgivelsesdato: | 1. januar 2018 06:00 |
| Størrelse: | 3416 x 3463 px |
Om objektet
| Navn: | NGC 1398 |
| Type: | Local Universe : Galaxy : Type : Spiral |
| Afstand: | 65 million lysår |
| Constellation: | Fornax |
Baggrundsbilleder
Koordinater
| Position (RA): | 3 38 51.93 |
| Position (Dec): | -26° 20' 13.29" |
| Field of view: | 7.17 x 7.27 arcminutes |
| Orientering: | Nord er -0.0° venstre fra lodret |
Farver & filtre
| Bånd | Bølgelængde | Teleskop |
|---|---|---|
| Optisk B | 440 nm | Very Large Telescope FORS2 |
| Optisk V | 557 nm | Very Large Telescope FORS2 |
| Optisk R | 655 nm | Very Large Telescope FORS2 |
| Optisk H-alpha | 660 nm | Very Large Telescope FORS2 |
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