  For the first time in literature, we provide an exact analytical scheme for
calculating the analogous Hawking temperature and surface gravity for general
relativistic accretion onto astrophysical black holes. Our calculation may
bridge the gap between the theory of transonic astrophysical accretion and the
theory of analogous Hawking radiation, and may allow one to compare the
properties of the two types of horizons, electromagnetic and acoustic, in
connection to the black hole physics. We show that the domination of the
analogous Hawking radiation over the actual Hawking radiation may be a real
astrophysical phenomena. We also discuss the possibilities of the emergence of
analogous white holes around astrophysical black holes. Our calculation is
general enough to accommodate accreting black holes with any mass.
