Abstract:
We studied the outflow behaviour from accretion discs around black holes taking into account
the vertical equilibrium accretion flow model. The outflow rate is found to depend crucially
on flow composition. Our approach is to study the outflow behaviour as function of inflow
around black holes with an equation of state which allows flow to be thermally relativistic
close to black holes and non-relativistic far away from black holes. We studied shock ejection
model. A pure electron–positron pair flow never undergoes shock transition while presence
of some baryons (common in outflows and jets) makes it possible to have standing shock
waves in the flow. It can be concluded that the presence of protons is necessary for the flow to
show the outflow behaviour. The outflow rate is maximum when the flow contains the proton
number density which is 27 per cent of the electron number density. We conclude that a pure
electron–positron jet is unlikely to form.
