En rosette fra VLT
Det flotte billede her viser en del af Rosettetågen i stjernebilledet Monoceros (Enhjørningen).Det er en emissionståge, som består af skyer af gasarter. Det lyser fordi de bliver bestrålet med energirigt lys fra stjerner inde i tågen. Rosettetågen er et typisk eksempel på sådan en emissionståge - men at den er typisk, betyder ikke, at den er kedelig! Disse tåger er nogle af de smukkeste himmelobjekter, man kan se på, og vi ser dem her og det som billeder optaget med astronomiske teleskoper.
I denne slags tåger blander gas og støv sig; i gang med at danne en ny generation stjerner. Til at begynde med er disse nydannede stjerner indhyllet i de støvskyer, som de er født af, så de kan ikke ses i synligt lys. Efter nogen tid - i kosmisk forstand, dvs. nogle millioner år - blæser de det tætte stof i omgivelserne væk, og de unge stjerners energirige stråling strømmer ud og ioniserer de omgivende gasser, så de lyser op. Alt det ser man i billedet her; blandingen af lysende gas og mørke støvbånd, som slynger sig ind i hinanden i komplekse mønstre, som røgen fra et bål.
Billedet her er optaget med instrumentet FORS 2 på ESOs Very Large Telescope, i det barske landskab, som Chiles Atacamaørken er. FORS2 er et meget alsidigt instrument, som kan give os højkvalitetsbilleder som dette her. Samtidig er det en spektrograf, som kan opsplitte lyset i regnbuens farver, så astronomerne kan få informationer om den kemiske sammensætning af objekter langt ude i Universet.
I ESOs program Cosmic Gems, bruges ESO-teleskoperne til optagelser som denne på tidspunkter, hvor forholdene ikke er ideelle til det tunge videnskabelige arbejde. Istedet optages billeder, som kan være interessante, mærkelige eller slet og ret smukke, til brug for undervisning og formidling. Og skulle forskerne få brug for optagelserne, er de også tilgængelige i ESOs arkiv.
Kilde:ESO
Om billedet
| Id: | potw1847a |
| Sprog: | da |
| Type: | Observation |
| Udgivelsesdato: | 19. november 2018 06:00 |
| Størrelse: | 1770 x 1710 px |
Om objektet
| Navn: | Rosette Nebula |
| Type: | Milky Way : Nebula : Appearance : Emission |
| Constellation: | Monoceros |
Baggrundsbilleder
Koordinater
| Position (RA): | 6 30 42.80 |
| Position (Dec): | 5° 0' 22.40" |
| Field of view: | 7.44 x 7.19 arcminutes |
| Orientering: | Nord er 90.0° droite 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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