A raw spectrum obtained with FORS

A long, narrow slit isolates a small strip of sky. On this image, the slit is vertical. The spectrograph then splits the light from the slit into its individual colours, each point of the slit forming a horizontal rainbow. In this spectrum, the light from a distant galaxy appears as a faint horizontal line, peppered with bright dots corresponding to the colours emitted by the gas in the galaxy.

Crédit:

ESO

À propos de l'image

Identification:fors2_spectrum
Type:Observation
Date de publication:9 avril 2014 11:42
Taille:2036 x 2068 px

À propos de l'objet

Nom:FORS2
Type:Unspecified : Technology : Observatory : Instrument
Catégorie:Paranal

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Couleurs & filtres

DomaineTélescope
Very Large Telescope
FORS2