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

Fullsize Original
313.5 KB
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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