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- Mike Cai, Theoretical Institute of Advance Research in Astrophysics and
Academia Sinica Institute of Astronomy & Astrophysics, Taiwan.
According to the general theory of relativity, null geodesics suffer appreciable bending
in strong gravity field. Due to such gravitational lensing effect, an astrophysical black hole
is expected to cast a `shadow' which will be larger in size than its event horizon. The
orientation geometry as well as the geometric dimension of such `shadow' can be numerically
simulated using the ray tracing technique, if the properties (dynamical as well as radiative)
of the relativistically accreting matter can be understood.
We plan to apply our general relativistic multi-transonic shocked accretion flow
onto the central black hole of our Galactic centre, and thus, would like to
map the shadow of the SgrA* black hole. This will help to study the visibility function,
which, in turn, may be useful to estimate certain parameters of the central black hole
configuration.
Tapas Kumar Das
2009-01-17