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. 

Kredit:

ESO

O snímku

Id:eso0006a
Typ:Pozorování
Datum zveřejnění:17. února 2000
Související články:eso0006
Velikost:942 x 862 px

O objektu

Jméno:AXAF Deep Field
Typ:Early Universe : Galaxy : Grouping : Cluster
Kategorie:Galaxy Clusters

Image Formats

největší JPEG
400,4 KB

Pozadí

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

Barvy & filtry

PásmoDalekohled
Infračervený
K
Very Large Telescope
ISAAC

Exposure time: 30600s