Bondi Flows on Compact Objects Revisited

Details Bondi Flows on Compact Objects Revisited Bondi Flows on Compact Objects Revisited

1997-06-02

arxiv.org/abs/astro-ph/9706002v1

Astronomy and Astrophysics

Astrophysics

7 Latex pages including figures. Macros included. Astronomy and Astrophysics (in press)

Scientific paper

We revisit Bondi flows on black holes, naked singularities and neutron stars keeping in mind recent progress in understanding of the flow behaviour near compact objects. In an adiabatic spherical accretion on black holes and naked singularities, standing shock waves do not form, but shocks on neutron stars may or may not form depending on the boundary conditions. For low accretion rates (hard state), these objects may behave similarly. However, for high accretion rates (soft state), the converging flow on a black hole will produce a weak hard tail of energy spectral slope of $\sim 1.5$ (apart from the soft bump) while the flow on a neutron star or a naked singularity will have no hard tail. The soft bumps of neutron star candidates may generally be at higher energies than those of naked singularities.

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