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.

Crédito:

ESO

Sobre la imagen

Identificador:eso9805d
Tipo:Observación
Fecha de publicación:29 de Enero de 1998
Noticias relacionadas:eso9805
Tamaño:510 x 509 px

Sobre el objeto

Nombre:Abell 370
Tipo:Early Universe : Galaxy : Grouping : Cluster
Distancia:z=0.375 (desplazamiento al rojo)
Constellation:Cetus
Categoría:Galaxy Clusters

Formatos de imagen

Tamaño original
610,7 KB
JPEG grande
144,6 KB

Fondo de pantalla

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

Coordenadas

Position (RA):2 39 50.49
Position (Dec):-1° 35' 8.21"
Field of view:4.92 x 4.91 arcminutes
Orientación:El norte está a 0.2° a la izquierda de la vertical

Colores y filtros

BandaLongitud de ondaTelescopio
Infrarrojo
J
1.25 μmNew Technology Telescope
SOFI