En sky med overraskelser
Her er et område tæt ved Mælkevejens midterplan; i stjernebilledet Skorpionen. I området findes en tæt sky af støv og gas, som hører til molekylskyen IRAS 16562-3959. På billedet er den sky tydeligt synlig som et orange skær omkring de tætliggende stjerner i midten af billedet.
I skyer som denne dannes der nye stjerner. I midten af skyen skimter man lige netop det klare objekt G345.4938+01.4677. Det er en meget ung stjerne, som er under dannelse fordi skyen skrumper, trukket sammen af tyngdekraften.
Den unge stjerne er meget klar og meget tung. Den vejer omkrng 15 gange mere end Solen. For nyligt er der rapporteret nyt om netop denne stjerne fra ALMA (Atacama Large Millimeter/submillimeter Array. Forskerholdet har gjort en overraskende opdagelse inde i skyen G345.4938+01.4677 — Der er en stor skive af gas og støv omkring den nydannede stjerne, og der er en stribe af stof, som strømmer ud fra den. Det er ikke i overensstemmelse med de gængse teorier, at der skulle være skiver og striber omkring stjerner af denne type, fordi den intense stråling fra så tunge stjerner skulle blæse alt materialet væk - det sker altså bare ikke altid!
Billedet er taget med Visible and Infrared Survey Telescope for Astronomy (VISTA), som er en del af ESOs Paranal Observatorium i Chiles Atacamaørken. VISTA er verdens største oversigtsteleskop, med et hovedspejl, som er mere end fire meter i diameter. Farvebilledet her stammer fra VVV survey, som er et af seks store offentlige surveys, altså kortlægningsprojekter over den sydlige himmelhalvkugle.
Den klare stjerne forneden til venstre i billedet er HD 153220.
Kilde:ESO/VVV Team/A. Guzmán
Om billedet
| Id: | potw1448a |
| Sprog: | da |
| Type: | Observation |
| Udgivelsesdato: | 1. december 2014 10:00 |
| Størrelse: | 2640 x 2637 px |
Om objektet
| Navn: | IRAS 16562-3959 |
| Type: | Milky Way : Nebula : Appearance : Dark : Molecular Cloud |
| Constellation: | Scorpius |
Baggrundsbilleder
Koordinater
| Position (RA): | 16 59 41.76 |
| Position (Dec): | -40° 3' 42.70" |
| Field of view: | 14.99 x 14.98 arcminutes |
| Orientering: | Nord er 38.1° droite fra lodret |
Farver & filtre
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