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).

Bildnachweis:

ESO

Über das Bild

ID:eso0015b
Typ:Aufsuchkarte
Veröffentlichungsdatum:13. April 2000
Dazugehörige Veröffentlichungen:eso0015
Größe:800 x 597 px

Über das Objekt

Name:MS 1008-1224 field, Spectrum
Typ:Early Universe : Galaxy : Activity : AGN : Quasar
Entfernung:z=4.0 (Rotverschiebung)
Kategorie:Quasars and Black Holes

Bildformate

Großes JPEG
66,3 KB

Farben & Filter

SpektralbereichTeleskop
Infrarot
Near-IR
Very Large Telescope
FORS2
OptischVery Large Telescope
FORS2