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
• X - Quasars & Black Holes
Distance:z=2.4 (redshift)

Image Formats

Fullsize Original
432.2 KB
Large JPEG
283.8 KB
Screensize JPEG
83.7 KB

Colours & filters

BandTelescope
UltravioletVery Large Telescope
UVES

 

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