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

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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
• X - Galaxy Clusters
Distance:z=0.375 (redshift)
Constellation:Cetus

Image Formats

Large JPEG
143.5 KB
Screensize JPEG
348.2 KB

Wallpapers

1024x768
326.4 KB
1280x1024
460.9 KB
1600x1200
573.1 KB
1920x1200
603.2 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
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Colours & filters

BandWavelengthTelescope
Infrared
J
1.25 μm New Technology Telescope
SofI

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