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Dense and Warm Molecular Gas between Double Nuclei of the Luminous Infrared Galaxy NGC 6240

机译:发光红外星系NGC 6240双核之间的致密热分子气体

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Highspatialresolutionobservationsofthe$${{12atop}mathrm{CO}}$$(1a€“0),HCN(1a€“0),$$mathrm{HCO}^{mkern-1.26421mu{+}mkern-2.52842mu}$$(1a€“0),and$${{13atop}mathrm{CO}}$$(1a€“0)molecularlinestowardtheluminousinfraredmergerNGC6240havebeenperformedusingtheNobeyamaMillimeterArrayandtheRAINBOWInterferometer.Alloftheobservedmolecularemissionlinesareconcentratedintheregionbetweenthedoublenucleiofthegalaxy.However,thedistributionsofbothHCNand$$mathrm{HCO}^{{mkern-1.26421mu{+}mkern-2.52842mu}}$$emissionsaremorecompactcomparedwiththatof$${{12atop}mathrm{CO}}$$,andtheyarenotcoincidentwiththestar-formingregions.The$$mathrm{HCN}/{{12atop}mathrm{CO}}$$lineintensityratiois0.25;thissuggeststhatmostofthemoleculargasbetweenthedoublenucleiisdense.Acomparisonoftheobservedhigh$$mathrm{HCN}/{{13atop}mathrm{CO}}$$intensityratio,5.9,withlargevelocitygradientcalculationssuggeststhatthemoleculargasisdense[$$n(mathrm{H}_2)=10^{4hbox{--}6},mathrm{cm}^{-3}$$]andwarm($$T_{mathrm{kin}}gt50,mathrm{K}$$$$T_{mathrm{kin}}gt50,mathrm{K}$$).TheobservedstructureinNGC6240maybeexplainedbytimeevolutionofthemoleculargasandstarformation,whichwasinducedbyanalmosthead-oncollisionorverycloseencounterofthetwogalacticnucleiaccompaniedwiththedensegasandstar-formingregions.
机译:$$ {{12atop} mathrm {CO}} $$(1a€0),HCN(1a€“ 0),$$ mathrm {HCO} ^ {mkern-1.26421mu {+} mkern-2.52842mu} $的高空间分辨率观测$(1A€“0),并且$$ {{13atop} mathrm {CO}} $$(1A€“0)molecularlinestowardtheluminousinfraredmergerNGC6240havebeenperformedusingtheNobeyamaMillimeterArrayandtheRAINBOWInterferometer.Alloftheobservedmolecularemissionlinesareconcentratedintheregionbetweenthedoublenucleiofthegalaxy.However,thedistributionsofbothHCNand $$ mathrm {HCO} ^ {{mkern-1.26421mu {+ } mkern-2.52842mu}} $$的排放与$$ {{12atop} mathrm {CO}} $$相比更紧凑,并且它们与形成恒星的区域并不相同。$$ mathrm {HCN} / {{12atop} mathrm {CO}} $$ lineintensityratiois0.25 ;这表明双核之间的大部分分子气体密集。比较观察到的高$$ mathrm {HCN} / {{13atop} mathrm {CO}} $$强度比5.9,建议采用大速度梯度计算,认为分子束密度= [$ {H $ {n {n} mathrm {cm} ^ {-3} $$] andwarm($$ T_ {mathrm {kin}} gt50,mathrm {K} $$$$ T_ {mathrm {kin}} gt50,mathrm {K} $$)。NGC6240中观察到的结构可以通过分子气体和星型的时间演化来解释,这是由两个银河核的几乎头顶碰撞或伴随着密集的气体和恒星形成区域而引起的。

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