  We show that spherical accretion onto astrophysical black holes can be
considered as a natural example of analogue system. We provide, for the first
time, an exact analytical scheme for calculating the analogue 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 analogue Hawking
radiation. We show that the domination of the analogue Hawking temperature over
the actual Hawking temperature may be a real astrophysical phenomena. We also
discuss the possibilities of the emergence of analogue white holes around
astrophysical black holes. Our calculation is general enough to accommodate
accreting black holes with any mass.
