Figure 12:
Two different model simulations of
cosmological sheets are presented: a six species
model
including only atomic line cooling
(left), and a nine species model including also hydrogen
molecules
(right). The evolution sequences in
the images show the baryonic overdensity and gas
temperature at
three redshifts following the
initial collapse at
. In each figure, the vertical axis
is
long (parallel to the plane of
collapse) and the horizontal axis extends to
on a logarithmic
scale to emphasize the central
structures. Differences in the two cases are observed in
the cold pancake
layer and the cooling flows between
the shock front and the cold central layer. When the
central layer
fragments, the thickness of the
cold gas layer in the six (nine) species case grows
to
and
the surface density evolves with a
dominant transverse mode corresponding to a scale of
approximately
. Assuming a symmetric distribution
of matter along the second transverse direction,
the
fragment masses are
approximately
(
) solar masses.
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