Quasar spectrum, VLT spectrograph

Numéro d’image : 12347522
Quasar spectrum, VLT spectrograph
Quasar spectrum. Spectrograph obtained by the Very Large Telescope (VLT), showing the range of light emitted by a distant quasar (quasi-stellar object) known as HE0940-1050. Quasars are powerful and active galactic nuclei observed at immense distances in the early universe. Powered by supermassive black holes, they emit huge amounts of radiation and are among the brightest objects in the known Universe. The changes in the spectra of quasars as their light travels towards us, allow the identification of elements in the intergalactic medium. This spectrum has absorption lines (black). It was obtained by the UVES (Ultraviolet and Visual Echelle Spectrograph) instrument mounted on the VLT. These absorption lines include the faintest ever observed in a quasar spectrum. Image published in 2016.
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Crédit: Science Photo Library / EUROPEAN SOUTHERN OBSERVATORY
Taille de l’image : 5951 px × 5210 px
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