Spectrum of 24.5-mag quasar in MS1008 field

The spectrum obtained with FORS2 at KUEYEN of a quasar at redshift z = 4.0, lensed by the massive cluster of galaxies MS 1008. The redshifted Lyman-alpha line from hydrogen (rest wavelength 1216 Å in the far-ultraviolet part of the spectrum) is clearly seen in emission at 6025 Å as a high peak in the red spectral region. Another emission line, from four times ionized nitrogen (rest wavelength 1240 Å), is seen in the right wing of the Lyman-alpha line. The spectrum was obtained after two hours of exposure through a 1.0 arcsec slit in good atmospheric conditions (seeing: 0.6 arcsec).

Crédit:

ESO

À propos de l'image

Identification:eso0015b
Type:Graphique
Date de publication:13 avril 2000
Communiqués de presse en rapport:eso0015
Taille:800 x 597 px

À propos de l'objet

Nom:MS 1008-1224 field, Spectrum
Type:Early Universe : Galaxy : Activity : AGN : Quasar
Distance:z=4.0 (redshift)
Catégorie:Quasars and Black Holes

Formats des images

Grand JPEG
66,3 Kio

Couleurs & filtres

DomaineTélescope
Infrarouge
Near-IR
Very Large Telescope
FORS2
VisibleVery Large Telescope
FORS2