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Central Spiral Structure of Molecular Gas in Maffei 2

机译:Maffei 2中分子气体的中心螺旋结构

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ThedistributionandkinematicsofmoleculargasinthecentralregionofthebarredspiralgalaxyMaffei2wereinvestigatedusingadatasetof$$^{12}$$CO(1-0),$$^{12}$$CO(2a€“1),CS(2a€“1)lines,and103GHzcontinuum.Wefoundthattheoffsetridgesalongthekpc-scalebarcontinuetothecentralspiralstructureembeddedinaweakovalstructure,whichisregardedasan$$x$$2orbitinthebarpotential.Thespiralstructurecontinuestowardthecenter,divergingfromtheovalstructure.Thesizeofthesestructuresislessthan$$R$$$$sim$$100pc.Themassconcentrationwithin$$R=$$35pcisestimatedtobe$$2 imes10^{8}M_{odot}$$.Thehighmassconcentrationisconsistentwiththeoreticalpredictionsconcerningthecreationofsuchanuclearspiralstructure.Acomparisonwithtracersofdensegasandstar-formingregionsuggeststhatthedensemoleculargastracedbytheCS(2a€“1)lineisformedatthecrossingpointsofthe$$x$$1and$$x$$2orbitsandthestar-formingregionappearsafter$$2 imes10^{5}$$yr,whichiscomparabletothefree-falltimeofdensegastracedbytheCSline($$sim$$$$10^{5}$$cm$$^{-3}$$).
机译:我们使用$$ {{12} $$ CO(1-0),$$ ^ {12} $$ CO(2a€“ 1),CS(2a€” 1)线和103GHz连续的结构来研究棒状螺旋星系Maffei2中心区域的分子气体分布和运动学,发现其到了此偏移量的水平。 X $$ 2orbitinthebarpotential.Thespiralstructurecontinuestowardthecenter,divergingfromtheovalstructure.Thesizeofthesestructuresislessthan $$ř$$$$ SIM $$ 100pc.Themassconcentrationwithin $$ R = $$ 35pcisestimatedtobe $$ 2 imes10 ^ {8} {M_ ODOT} $$。Thehighmassconcentrationisconsistentwiththeoreticalpredictionsconcerningthecreationofsuchanuclearspiralstructure.Acomparisonwithtracersofdensegasandstar-formingregionsuggeststhatthedensemoleculargastracedbytheCS(在$$ x $ 1和$$ x $$ 2的交叉点上形成2a€“ 1)线,在$$ 2 imes10 ^ {5} $$ yr之后出现星形成区域,这与CSline($$ sim $$$$ 10 ^ {5} $ cm $$ $ ^ {-3} $$)。

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