Dissipation of Magnetic Flux in Primordial Star Formation: From Run-away Phase to Mass-Accretion Phase

[摘要] Weinvestigatethedissipationofmagneticfluxinprimordialstar-formingcloudsthroughouttheircollapse,includingtherun-awaycollapsephaseaswellastheaccretionphase.Wesolvetheenergyequationandthenon-equilibriumchemicalreactionsinthecollapsinggas,inordertoobtaintheradialdistributionoftheionizedfractionduringthecollapse.Asaresult,wefindthattheionizedfractionishighenoughforthemagneticfieldtocouplewiththegasthroughoutevolutionofthecloud.Thisresultsuggeststhatthejetformationfromprotostarsaswellastheactivationofmagneto–rotationalinstabilityintheaccretiondiskareenabledinthepresenceofthecosmologicalseedmagneticfluxproposedbyLanger,Puget,andAghanim(2003,Phys.Rev.D67,43505).

[学科分类] 天文学(综合)

[关键词] "accretion;accretion disks";diffusion;"early universe";"stars: formation";"stars: magnetic fields"