The gas distribution in the high-redshift cluster MS 1054-0321
  We investigate the gas mass distribution in the high redshift cluster MS
1054-0321 using Chandra X-ray and OCRA SZ effect data. We use a superposition
of offset $\beta$-type models to describe the composite structure of MS
1054-0321. We find gas mass fractions $f_{gas}^\rm{X\mbox{-}ray} =
0.087_{-0.001}^{+0.005}$ and $f_{gas}^\rm{SZ} = 0.094_{-0.001}^{+0.003}$ for
the (main) eastern component of MS 1054-0321 using X-ray or SZ data, but
$f_{gas}^\rm{X\mbox{-}ray} = 0.030 _{-0.014}^{+0.010}$ for the western
component. The gas mass fraction for the eastern component is in agreement with
some results reported in the literature, but inconsistent with the cosmic
baryon fraction. The low gas mass fraction for the western component is likely
to be a consequence of gas stripping during the ongoing merger. The gas mass
fraction of the integrated system is $0.060_{-0.009}^{+0.004}$: we suggest that
the missing baryons from the western component are present as hot diffuse gas
which is poorly represented in existing X-ray images. The missing gas could
appear in sensitive SZ maps.
