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We demonstrate that a spherical accretion onto astrophysical black holes,under the influence of Newtonian or various post-Newtonian pseudo-Schwarzschildgravitational potentials, may constitute a concrete example of classicalanalogue gravity naturally found in the Universe. We analytically calculate thecorresponding analogue Hawking temperature as a function of the minimum numberof physical parameters governing the accretion flow. We study both thepolytropic and the isothermal accretion. We show that unlike in a generalrelativistic spherical accretion, analogue white hole solutions can never beobtained in such post-Newtonian systems. We also show that an isothermalspherical accretion is a remarkably simple example in which the only oneinformation--the temperature of the fluid, is sufficient to completely describean analogue gravity system. For both types of accretion, the analogue Hawkingtemperature may become higher than the usual Hawking temperature. However, theanalogue Hawking temperature for accreting astrophysical black holes isconsiderably lower compared with the temperature of the accreting fluid.Comment: Final Version to appear in the journal General Relativity &  Gravitation, Volume 27, Issue 11, 2005. 17 pages, Two colour and one black  and white figures. Typos corrected. Recent reference on analogue effect in  relativistic accretion disc adde

Pseudo-schwarzschild spherical accretion as a classical black hole analogue