Hydrodynamic Drag on a Compact Star Orbiting a Supermassive Black Hole | Zendy

Ramesh Narayan | Zendy

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Hydrodynamic Drag on a Compact Star Orbiting a Supermassive Black Hole

Author(s) -

Ramesh Narayan

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/308956

Subject(s) - physics , supermassive black hole , gravitational wave , astrophysics , accretion (finance) , astronomy , black hole (networking) , intermediate mass black hole , spin flip , drag , binary black hole , galaxy , mechanics , computer network , routing protocol , routing (electronic design automation) , computer science , link state routing protocol

The proposed Laser Interferometer Space Antenna is expected to detectgravitational waves from neutron stars and stellar-mass black holes spiralinginto supermassive black holes in distant galactic nuclei. Analysis of theinspiral events will require careful comparison of the observed signals withtheoretical waveform templates. The comparison could be seriously compromisedif non-gravitational torques modify the orbit of the star. This paper estimatesthe torque exerted on an orbiting star as a result of hydrodynamic interactionswith an accretion flow around the supermassive black hole. It is argued thatthe majority of inspiral events will take place in low luminosity galacticnuclei in which the mass accretion rate is low and the accretion occurs via anadvection-dominated flow. The hydrodynamic torque is negligibly small in suchsystems and will have no effect on gravitational wave experiments.Comment: 8 pages, LaTeX, submitted to The Astrophysical Journa

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