Very deep near IR view of "AXAF Deep Field"

In order to be able to see such obscured and/or "evolved" galaxies in the early Universe, and to look for hitherto unknown galaxies beyond the limits of "deep-field" imaging in visible spectral bands, it is necessary to employ other observing techniques. The astronomers must search for such objects on large-field, very long-exposure sky images obtained in the near-infrared and far IR region of the electromagnetic spectrum. North is up and east is left. The reproduction is "negative", with dark objects on a light sky, in order to better show the faintest objects.

Technical note : This K-band image is the result of 510 min of integration time with ISAAC at VLT ANTU. The 3-sigma magnitude limit is about K = 23.5 per arcsec 2. A J-band image was also obtained during 200 min of integration, with a 3-sigma limit of J = 25 per arcsec 2. The seeing FWHM (Full Width at Half Maximum) is 0.65 arcsec for both bands. 

Crédit:

ESO

À propos de l'image

Identification:eso0006a
Type:Observation
Date de publication:17 février 2000
Communiqués de presse en rapport:eso0006
Taille:942 x 862 px

À propos de l'objet

Nom:AXAF Deep Field
Type:Early Universe : Galaxy : Grouping : Cluster
Catégorie:Galaxy Clusters

Formats des images

Grand JPEG
400,4 Kio
JPEG taille écran
416,8 Kio

Fonds d'écran

1024x768
376,9 Kio
1280x1024
559,0 Kio
1600x1200
710,4 Kio
1920x1200
745,6 Kio
2048x1536
968,4 Kio

Couleurs & filtres

DomaineTélescope
Infrarouge
K
Very Large Telescope
ISAAC

Exposure time: 30600s