We present the observation of the Tycho supernova remnant obtained with the
EPIC and RGS instruments onboard the XMM-Newton satellite. We compare imag
es and azimuthally averaged radial profiles in emission lines from differen
t elements (silicon and iron) and different transition lines of iron (Fe L
and Fe It). While the Fe XVII L line and Si XIII K line images are globally
spatially coincident, the Fe Ii emission clearly peaks at a smaller radius
, indicating a higher temperature toward the reverse shock. This is qualita
tively the profile expected when the reverse shock, after travelling throug
h the outer power-law density profile, has entered the central plateau of t
he ejecta. The high energy continuum map has an overall smooth distribution
, with a similar extent to the radio emission. Its radial profile peaks fur
ther out than the lines emission. Brighter and harder continuum regions are
observed with a rough bipolar symmetry in the eastern and western edges. T
he spectral analysis of the southeastern knots supports spatial variations
of the relative abundance of silicon and iron, which implies an incomplete
mixing of the silicon and iron layers.