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Lyman-alpha forest in QSO HE2217-2818
A tracing of one spectral order, corresponding to one horizontal line in the echelle spectrum. It shows part of the Lyman-alpha forest in the ultraviolet spectrum of the southern quasar QSO HE2217-2818 . The absorption lines are caused by intervening, neutral hydrogen gas located at different distances along the line-of-sight towards this quasar.
Crédit:ESO
À propos de l'image
| Identification: | eso9944e |
| Type: | Graphique |
| Date de publication: | 5 octobre 1999 |
| Communiqués de presse en rapport: | eso9944 |
| Taille: | 3003 x 1540 px |
À propos de l'objet
| Nom: | QSO HE2217-2818, Spectrum |
| Type: | Early Universe : Galaxy : Activity : AGN : Quasar |
| Distance: | z=2.4 (redshift) |
| Catégorie: | Quasars and Black Holes |
Couleurs & filtres
| Domaine | Télescope |
|---|---|
| Ultraviolet | Very Large Telescope UVES |