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.

Herkunftsnachweis:

ESO

Über das Bild

ID:eso9805d
Typ:Beobachtung
Veröffentlichungsdatum:29. Januar 1998
Dazugehörige Veröffentlichungen:eso9805
Größe:510 x 509 px

Über das Objekt

Name:Abell 370
Typ:Early Universe : Galaxy : Grouping : Cluster
Entfernung:z=0.375 (Rotverschiebung)
Constellation:Cetus
Kategorie:Galaxy Clusters

Bildformate

Großes JPEG
144,6 KB

Bildschirm-Hintergrundbilder

1024x768
326,6 KB
1280x1024
461,1 KB
1600x1200
573,3 KB
1920x1200
603,1 KB
2048x1536
780,1 KB

Koordinaten

Position (RA):2 39 50.49
Position (Dec):-1° 35' 8.21"
Field of view:4.92 x 4.91 arcminutes
Orientierung:Die Nordrichtung liegt 0.2° links zur Vertikale

Farben & Filter

SpektralbereichWellenlängeTeleskop
Infrarot
J
1.25 μmNew Technology Telescope
SOFI

 

Siehe auch