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 high contrast that shows the faintest objects recorded.

Kredit:

ESO

O snímku

Id:eso9801a
Typ:Pozorování
Datum zveřejnění:13. ledna 1998
Související články:eso9801
Velikost:2579 x 2432 px

O objektu

Jméno:NTT Susi Deep Field
Typ:Early Universe : Galaxy : Grouping : Cluster
Vzdálenost:z=4.0 (rudý posuv)
Constellation:Virgo
Kategorie:Galaxy Clusters

Image Formats


Pozadí

1024x768
315,2 KB
1280x1024
493,7 KB
1600x1200
674,6 KB
1920x1200
765,7 KB
2048x1536
1019,6 KB

Souřadnice

Position (RA):12 5 22.73
Position (Dec):-7° 44' 11.51"
Field of view:2.41 x 2.28 arcminutes
Orientace:Sever je 89.6° pravá od svislé osy

Barvy & filtry

PásmoVlnová délkaDalekohled
Optický
B
New Technology Telescope
SUSI
Optický
V
New Technology Telescope
SUSI
Infračervený
I
16 μmNew Technology Telescope
SUSI
Optický
R
New Technology Telescope
SUSI