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**Session 40 - Radiogalaxies & Jets.**

*Display session, Tuesday, January 14*

*Metropolitan Ballroom, *

## [40.05] Models of Superluminal Sources: Relativistic Hydrodynamics and Radiation Transfer

*P. A. Hughes (U. Michigan), A. J. Mioduszewski (NRAO), G. C. Duncan (Bowling Green State U.)*
We present a family of jet simulations performed with a
recently constructed relativistic hydrodynamic code. In one
case we modulate the inflow to emulate a `restarting' jet,
and present the results of radiation transfer calculations
that compute the synchrotron intensity allowing for Doppler
shift and boost, and for time-delay effects. These are the
first such VLBI map simulations to incorporate all relevant
relativistic effects in a way that admits an extensive
exploration of parameter space: the mapping used to
estimate radiating particle density, the properties of the
particle spectrum, and the angle of view.

Even without relativistic effects, because of integration
along the line of sight, the intensity maps contain much
less structure than is seen in slices of the underlying
hydrodynamic variables; time delays further reduce the
extent to which knots are visible in a disturbed flow.
Nevertheless, propagating structures are still evident, and
the adopted approach -- performing the hydrodynamics and
radiation transfer as distinct steps, despite the demand
imposed on computer resources because of the need to store
the entire history of the hydrodynamic simulation --
readily admits using a variety of diagnostics that explore
the relation between observable structures and the
underlying flow. This approach will be critical for the
interpretation of the next generation of VLBI maps.

For the components of sources such as 3C 345 to remain
distinct, despite the very small viewing angle inferred
from recent VLBI/P observations, their intrinsic separation
must be many hundred jet radii. We present both
hydrodynamic simulations and the associated radiation
transfer calculations for such a flow.

**Program
listing for Tuesday**