Lyman-alpha Forest at z~2.0 in quasar spectrum

This chart shows a small part of the normalized UV-spectrum of the 16-mag QSO HE22-28 at z = 2.4, exposed for a total of 7.5 hours at spectral resolution about 40,000. It provides a fine illustration of the excellent quality of the reduced data from this instrument. Most of the lines are due to Lyman-alpha clouds at redshifts in the little-studied interval z = 1.9-2.1, cf. the text.



About the Image

Release date:6 April 2000
Related releases:eso0013
Size:800 x 392 px

About the Object

Name:QSO HE22-28
Type:Early Universe : Galaxy : Activity : AGN : Quasar
Distance:z=2.4 (redshift)
Category:Quasars and Black Holes

Image Formats

Large JPEG
71.9 KB
Screensize JPEG
88.0 KB

Colours & filters

UltravioletVery Large Telescope