Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-06-17
Astronomy and Astrophysics
Astrophysics
12 pages(19 postscript figures), accepted for publication in AJ
Scientific paper
10.1086/300546
We apply a new non-parametric technique to reconstruct, with uncertainties, the projected mass distribution of the inner region of Abell 2218, using combined strong and weak lensing constraints from multiple-image systems and arclets with known redshifts. The reconstructed mass map broadly resembles previous, less detailed, parametric models, but when examined in detail shows several sub-structures, not necessarily associated with light but strongly required by the lensing data. In particular, the highest mass peak is offset by about 30 kpc/h50 from the main light peak, and projected mass-to-light in the directions of different cluster galaxies varies by at least a factor of 10. On comparing with mass estimates from models of the X-ray emitting gas, we find that the X-ray models under-predict the enclosed mass profile by, at least a factor of 2.5; the discrepancy gets worse if we assume that mass traces light to the extent allowed by the lensing constraints.
AbdelSalam Hanadi M.
Saha Prasenjit
Williams Liliya L. R.
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