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
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 |
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
| Band | Wavelength | Telescope |
| Infrared J |
1.25 μm | New Technology Telescope SofI |
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