A Group of Objects at Redshift 3.04

This is a "true-colour" image of part of the sky field near the quasar Q 1205-30. Red, blue and yellow objects are displayed with their true colours, while objects at a redshift of about 3 and with strong Lyman-alpha emission lines have a bright green colour (see the text). Six Lyman-alpha Emitting Galaxy-building Objects (LEGOs for short) are marked by hexagons. The quasar (at the lower left) is marked by a larger hexagon and is seen to have an extended Lyman-alpha cloud in front of it, here visible as extended green light.

Technical information: this image is a colour composite, based on three images. The green channel is based on images with a total exposure time of 17.8 hours, obtained through a 2 nm wide, optical filter, centred at wavelength 490.6 nm and obtained in 1998 with the SuSI2 instrument at the ESO 3.58-m New Technology Telescope (NTT) on La Silla. The blue and red channels are based on 13 400-sec exposures in a B-filter and 15 250-sec exposures in an I-filter, respectively, both obtained with 8.2-m VLT ANTU telescope and the multi-mode FORS1 instrument. The field measures 3.0 x 1.8 arcmin 2. North is up and East is left. 

Credit:

ESO

About the Image

Id:eso0120b
Type:Observation
Release date:18 May 2001
Related releases:eso0120
Size:2940 x 1695 px

About the Object

Name:Q1205-30
Type:• Early Universe : Galaxy : Activity : AGN : Quasar
• X - Cosmology
• X - Quasars & Black Holes
Distance:z=3.04 (redshift)

Image Formats

Stor JPEG
520.8 KB
Screensize JPEG
109.8 KB

Wallpapers

1024x768
132.5 KB
1280x1024
180.4 KB
1600x1200
239.0 KB
1920x1200
301.4 KB
2048x1536
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Colours & filters

BandTelescope
Optical
B
Very Large Telescope
FORS1
Infrared
I
Very Large Telescope
FORS1

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