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.

Créditos:

ESO

Sobre a imagem

Id:eso9805d
Tipo:Observação
Data de divulgação:29 de Janeiro de 1998
Notícias relacionadas:eso9805
Tamanho:510 x 509 px

Sobre o objeto

Nome:Abell 370
Tipo:Early Universe : Galaxy : Grouping : Cluster
Distância:z=0.375 (desvio para o vermelho)
Constellation:Cetus
Categoria:Galaxy Clusters

Formatos de imagens

JPEG grande
144,6 KB

Papéis de parede

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
Orientação:O norte está a 0.2° à esquerda da vertical

Cores e filtros

BandaComprimento de ondaTelescópio
Infravermelho
J
1.25 μmNew Technology Telescope
SOFI