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.
Kilde:ESO
Om billedet
Id: | eso9805d |
Type: | Observation |
Udgivelsesdato: | 29. januar 1998 |
Relaterede pressemeddelelser: | eso9805 |
Størrelse: | 510 x 509 px |
Om objektet
Navn: | Abell 370 |
Type: | Early Universe : Galaxy : Grouping : Cluster |
Afstand: | z=0.375 (rødforskydning) |
Constellation: | Cetus |
Kategori: | Galaxy Clusters |
Baggrundsbilleder
Koordinater
Position (RA): | 2 39 50.49 |
Position (Dec): | -1° 35' 8.21" |
Field of view: | 4.92 x 4.91 arcminutes |
Orientering: | Nord er 0.2° venstre fra lodret |
Farver & filtre
Bånd | Bølgelængde | Teleskop |
---|---|---|
Infrarød J | 1.25 μm | New Technology Telescope SOFI |