Abell 2218 

Abell 2218 consists of a foreground galaxy cluster located nearly 2 billion light years away (z=.17), 
which is gravitationally lensing a far more distant galaxy group that is approx 7 billion light years away (z=.7), 
depending on cosmological model and distance-term (Dt, Dn or Dl - see recent S&T article). 
This image is not sharpened or anything beyond basic processing of 6 30 min exp. 
The FWHM is 1.7 arcsec. The image captures more than 3 of the gravity-lensed arcs 
(faintly tinted for easier identification).
RCOS 12.5 inch Ritchey-Chretien at F/9




Return