A quasar in different colours

GROND images of the quasar PKS 1251-407. GROND observes simultaneously through 7 different filters in the visible and near-infrared, providing 7 images of the same object. In this case, the quasar appears much fainter in the blue images (the so-called Lyman drop-out), an indication of the quasar's distance.

Credit:

ESO

About the Image

Id:eso0730b
Type:Observation
Release date:6 July 2007
Related releases:eso0730
Size:2781 x 387 px

About the Object

Name:PKS 1251-407
Type:Early Universe : Galaxy : Activity : AGN : Quasar
Distance:z=4.46 (redshift)
Category:Quasars and Black Holes

Image Formats

Large JPEG
251.6 KB
Screensize JPEG
57.2 KB

Colours & filters

BandTelescope
InfraredMPG/ESO 2.2-metre telescope
GROND
OpticalMPG/ESO 2.2-metre telescope
GROND