NTT SUSI Deep Field

This colour image shows objects as faint as 26th magnitude and it illustrates well the performance in deep imaging at good angular resolution with a relatively modest investment in exposure time at a 4m-class ground-based telescope. Of the approximately 500 galaxies detected in this field, the largest fraction are expected to be at redshifts smaller than z = 1 and about 20 percent to have higher redshifts, up to z = 4 and possibly beyond. During this project, a total of 122 CCD frames were obtained in four colours [blue (B), green-yellow (V), red (r) and near-infrared (i-band)] with a total exposure time of no less than 31.5 hours. Total exposure times of 50400, 23400, 23400, 16200 seconds were obtained in the four bands, respectively. The frames cover a 2.3 x 2.3 arcmin 'empty sky' field centered south of the high-redshift quasar QSO BR 1202-0725 (z = 4.7), located just south of the celestial equator. These frames have been combined to produce a 'true' colour image in the sense that 'blue', 'green' and 'red' represent the B-, V- and (r+i)-frames, respectively. This version of the combined image has a lower contrast and brings forward structural details in the brighter objects in the field.

Credit:

ESO

About the Image

Id:eso9801b
Type:Observation
Release date:13 January 1998
Related releases:eso9801
Size:1110 x 1042 px

About the Object

Name:NTT Susi Deep Field
Type:• Early Universe : Galaxy : Grouping : Cluster
• X - Galaxy Clusters
Distance:z=4.0 (redshift)
Constellation:Virgo

Image Formats

Large JPEG
301.7 KB
Screensize JPEG
183.6 KB

Wallpapers

1024x768
206.1 KB
1280x1024
317.3 KB
1600x1200
414.0 KB
1920x1200
447.6 KB
2048x1536
586.5 KB

Coordinates

Position (RA):12 5 22.50
Position (Dec):-7° 44' 9.92"
Field of view:2.38 x 2.24 arcminutes
Orientation:North is 89.4° right of vertical

Colours & filters

BandTelescope
Optical
B
New Technology Telescope
SUSI
Optical
V
New Technology Telescope
SUSI
Optical
R
New Technology Telescope
SUSI
Infrared
I
New Technology Telescope
SUSI

 

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