ASTROPHYSICS: RESEARCH RESULTS FROM M.G. ABRAHAMYAN AND CO-AUTHORS UPDATE KNOWLEDGE OF ASTROPHYSICS

Science Letter
December 16, 2008

According to recent research from Yerevan, Armenia, "A vortical
mechanism for the collimation and acceleration of astrophysical jets is
proposed on the basis of exact solutions of the hydrodynamic equations
in a homogeneous gravitational field taking viscosity into account."

"Velocity profiles in the form of a jet structure with a uniformly
rotating trunk whose pressure decreases in time, and longitudinal
and converging radial flows of matter, are examined. Because of the
radial flow, the angular velocity of the trunk and the velocity of
the longitudinal flow of matter can accelerate exponentially or in
the manner of an "explosive" instability," wrote M.G. Abrahamyan and
colleagues (see also Astrophysics).

The researchers concluded: "Flows of this type have low energy
dissipation and can serve as unique channels for the acceleration
and collimation of jet eruptions from young stars, as well as from
active galactic nuclei and quasars."

Abrahamyan and colleagues published their study in Astrophysics
(VORTICAL MECHANISM FOR COLLIMATION AND ACCELERATION OF
JETS. Astrophysics, 2008;51(3):357-371).

For additional information, contact M.G. Abrahamyan, Erevan State
University, Yerevan, Armenia.

Publisher contact information for the journal Astrophysics is:
Springer, Plenum Publishers, 233 Spring St., New York, NY 10013, USA.

From: Emil Lazarian | Ararat NewsPress