ALMA observe une explosion stellaire au sein d’Orion
Les explosions d’étoiles sont le plus souvent assimilées à des supernovae, ou phases finales et particulièrement spectaculaires d’évolution stellaire. De nouvelles observations d’ALMA ciblées sur le complexe de la Nébuleuse d’Orion offrent cette fois un aperçu des processus explosifs se produisant à l’autre extrémité du cycle de vie des étoiles – au moment de leur naissance en l’occurrence. Les astronomes ont acquis ces dramatiques clichés des vestiges d’une explosion vieille de 500 ans en sondant les débris de la formation d’un groupe d’étoiles massives, démontrant par là-même la violence et l’instabilité de ce processus.
Les couleurs attribuées aux données d’ALMA reflètent le décalage Doppler relatif de l’onde de lumière millimétrique émise par le gaz de monoxyde de carbone. En bleu figure le gaz s’approchant de la Terre aux vitesses les plus élevées ; en rouge le gaz se déplaçant dans notre direction à des vitesses moindres.
L’image de fond se compose de clichés acquis dans le domaine optique ainsi que dans le proche infrarouge par le télescope Gemini South ainsi que par le Très Grand Télescope de l’ESO. Le célèbre Amas de jeunes étoiles chaudes du Trapèze figure au bas de cette image. Les données d’ALMA ne couvrent pas l’intégralité de cette image.
Crédit:ALMA (ESO/NAOJ/NRAO), J. Bally/H. Drass et al.
À propos de l'image
| Identification: | eso1711a |
| Langage: | fr-ch |
| Type: | Observation |
| Date de publication: | 7 avril 2017 15:00 |
| Communiqués de presse en rapport: | eso1711 |
| Taille: | 2707 x 2824 px |
À propos de l'objet
| Nom: | OMC, Orion Molecular Cloud |
| Type: | Milky Way : Star : Grouping : Cluster : Open |
| Distance: | 1400 années lumière |
| Constellation: | Orion |
Fonds d'écran
Coordinates
| Position (RA): | 5 35 14.08 |
| Position (Dec): | -5° 22' 2.33" |
| Field of view: | 4.02 x 4.20 arcminutes |
| Orientation: | North is 0.1° right of vertical |
Couleurs & filtres
| Domaine | Longueur d'onde | Télescope |
|---|---|---|
| Infrarouge Fe II | 1.64 μm | Gemini Observatory GSAOI |
| Infrarouge J | 1.25 μm | Very Large Telescope ISAAC |
| Infrarouge H | 1.65 μm | Very Large Telescope ISAAC |
| Infrarouge H2 | 2.12 μm | Gemini Observatory GSAOI |
| Infrarouge Ks | 2.2 μm | Very Large Telescope ISAAC |
| Millimétrique 216-233 GHz | 1.3 mm | Atacama Large Millimeter/submillimeter Array Band 6 |
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