Galaxy Cluster Abell 370

This is a J band image (1.25 micron) of the galaxy cluster Abell 370 (A370; redshift z = 0.375), obtained in 'jitter' mode, showing the famous gravitational arc just below the centre. The observations consisted of 24 exposures of 2 min each, made on randomly generated telescope positions within a sky region of 30 x 30 arcsec. The individual exposures have been sky subtracted using a running average determined from the same data and then re-centred and combined. The scale is 0.29 arcsec/pixel; the field is about 5 x 5 arcmin with North at the top and East to the left. The seeing was less optimal, about 1.2 arcsec. A J = 22 mag point source yields a signal-to-noise ratio of 4 within a 3 arcsec diameter aperture.

Credit:

ESO

About the Image

Id:eso9805d
Type:Observation
Release date:29 January 1998
Related releases:eso9805
Size:510 x 509 px

About the Object

Name:Abell 370
Type:Early Universe : Galaxy : Grouping : Cluster
Distance:z=0.375 (redshift)
Constellation:Cetus
Category:Galaxy Clusters

Image Formats

Large JPEG
144.6 KB
Screensize JPEG
348.4 KB

Wallpapers

1024x768
326.6 KB
1280x1024
461.1 KB
1600x1200
573.3 KB
1920x1200
603.1 KB
2048x1536
780.1 KB

Coordinates

Position (RA):2 39 50.49
Position (Dec):-1° 35' 8.21"
Field of view:4.92 x 4.91 arcminutes
Orientation:North is 0.2° left of vertical

Colours & filters

BandWavelengthTelescope
Infrared
J
1.25 μmNew Technology Telescope
SOFI

 

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