Viscous Accreting Magnetofluids around a Static Compact Object in Final Stages of Accretion Flow

Publications of the Astronomical Society of Japan

Ghanbari, Jamshid¹  Shaghaghian, Mahboobeh¹ 

[1] Department of Physics, School of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran , ,

关键词: accretion;    "general relativity";    magnetohydrodynamics;   

DOI  :  10.1093/pasj/61.6.1261

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Thedynamicsofthestationaryaxisymmetricconfigurationofaccretingmagnetofluidssurroundinganon-rotatingcompactobjectinthefinalstagesofaccretionflowispresentedhere.Wediscusstwoclassesofsolutionsfortheangularmomentum:aKepleriansolution,whichdemandsnoaccretionflowforthefluids,andanon-Kepleriansolution,whichrequiresaradialinflowvelocityforthematter.Forthespecialcaseofnopresenceofelectromagneticfields,twosetsofself-consistentanalyticalsolutionsoffullyrelativisticfluidequationsareobtainedseparatelyfortwodifferentequationsofstate.Theeffectofthebulkviscositycoefficientonthephysicalfunctionswasinvestigatedforeachstate,aswellastheboundsthatexertonthefreeparametersduetolaststagesoftheaccretion-flowcondition.Toresolvethemagnetohydrodynamicalequations,wewereinspiredbyprevioussetsofsolutions,sincethemagnetofluidequationsarejustthesameasthefluidonesinthecaseofvanishingelectromagneticfields.Theazimuthalcurrentinmagnetofluidsdoesn’tmodifythedipolarconfigurationofthecentralobjectmagneticfield,owingtothelackofafiniteresistivity.Thepresenceofthismagneticfielddoesn’taffecttheazimuthalvelocityoftheplasma,butdoesslowdownitsradialinflow,anddecreasethedensityandpressureoftheplasma.Despitetheroleimportanceofthebulkviscosityonthefluids’dynamicsintheabsenceofelectromagneticfields,exertingthemagneticfielddecreasesthisrole.

【 授权许可】

Unknown