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.

Credit:

ESO

About the Image

Id:eso9944e
Type:Chart
Release date:5 October 1999
Related releases:eso9944
Size:3003 x 1540 px

About the Object

Name:QSO HE2217-2818, Spectrum
Type:Early Universe : Galaxy : Activity : AGN : Quasar
Distance:z=2.4 (redshift)
Category:Quasars and Black Holes

Image Formats

Large JPEG
283.9 KB
Screensize JPEG
83.8 KB

Colours & filters

BandTelescope
UltravioletVery Large Telescope
UVES