The AXAF Deep Field

This image displays a 0.5° x 0.5° sky area in the direction of the so-called AXAF Deep Field in which few bright objects are seen. This photo results from the combination of 28 individual WFI exposures behind a B(lue) optical filter with a total exposure time of 7 hours. About 100,000 galaxies are visible in the original image that encompasses approx. 8000 x 8000 pixels (1 pixel = 0.24 arcsec). The light trail of an artificial satellite crosses the field. The High-Res version included here has been compressed by a factor of four in order to facilitate transport over the Web. North is up and East is left.

Twenty-eight exposures with a total integration time of 7 hours have been co-added. After each single exposure, the telescope was offset by a small angle in order to cover also the gaps between the eight CCD's in the mosaic and to enable removal of minor cosmetical blemishes of the detectors. Since the CCD mosaic of the WFI comprises 67 million pixels, a total of 1,900 million data points was thus used to construct this image. The related image processing, using the EIS WFI data reduction pipeline, recently developed at ESO, kept a powerful workstation fully busy for about 8 hours.

Crédit:

ESO

À propos de l'image

Identification:eso9954a
Type:Observation
Date de publication:21 décembre 1999
Communiqués de presse en rapport:eso9954
Taille:8166 x 7464 px

À propos de l'objet

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

Image Formats

Grand JPEG
1,9 Mio
JPEG taille écran
599,4 Kio

Fonds d'écran

1024x768
468,1 Kio
1280x1024
761,3 Kio
1600x1200
1,0 Mio
1920x1200
1,2 Mio
2048x1536
1,6 Mio

Coordinates

Position (RA):3 32 18.15
Position (Dec):-27° 48' 7.72"
Field of view:32.31 x 29.71 arcminutes
Orientation:North is 1.6° right of vertical

Couleurs & filtres

DomaineTélescope
Visible
B
MPG/ESO 2.2-metre telescope
WFI