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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >ASTE CO(3-2) Observations of the Southern Barred Spiral Galaxy NGC 986: a Large Gaseous Bar Filled with a Dense Molecular Medium
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ASTE CO(3-2) Observations of the Southern Barred Spiral Galaxy NGC 986: a Large Gaseous Bar Filled with a Dense Molecular Medium

机译：南条螺旋银河NGC 986的ASTE CO（3-2）观察：充满稠密分子介质的大型气态棒

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摘要

WepresentCO(3-2)emissionobservationstowardthe3a€2$$ imes$$3a€2(or20kpc$$ imes$$20kpcatadistanceof23Mpc)regionofthesouthernbarredspiralgalaxyNGC986usingtheAtacamaSubmillimeterTelescopeExperiment(ASTE).Thiseffortisapartofouron-goingextragalacticCO(3-2)imagingproject,ADIoS(ASTEDensegasImagingofSpiralgalaxies).OurCO(3-2)imagerevealedthepresenceofalarge(themajoraxisis14kpcintotallength)gaseousbarfilledwithadensemolecularmediumalongthedarklanesobservedinopticalimages.Thisisthelargesta€?dense-gasrichbara€?knowntodate.Thedensegasbar,discoveredinNGC986,couldbeahugereservoirofpossiblea€?fuela€?forfuturestarburstsinthecentralregion,andwesuggestthatstarformationinthecentralregionofNGC986couldstillbeinagrowingphase.WefoundagoodspatialcoincidencebetweentheoveralldistributionsofdensemoleculargastracedbyCO(3-2)andmassivestarformationdepictedbyH$$alpha$$.TheglobalCO(3-2)luminosity,$$La€?_{ mCO(3-2)}$$,ofNGC986wasdeterminedtobe(5.4$$pm$$1.1)$$ imes$$10$$^8$$Kkms$$^{-1}$$pc$$^2$$.TheCO(3-2)$$/$$CO(1-0)integratedintensityratiowasfoundtobe0.60$$pm$$0.13ataspatialresolutionof44$$a€?$$or5kpc,andtheCO(3-2)$$/$$CO(2-1)ratiowas0.67$$pm$$0.14atabeamsizeof$$sim$$25$$a€?$$or$$sim$$2.8kpc.TheselineratiossuggestmoderateexcitationconditionsofCOlines($$n_{ mH_2}$$$$sim$$10$$^{3-4}$$cm$$^{-3}$$)inafewkiloparsecregionofcentralNGC986.
机译：我们使用阿塔卡马亚毫米望远镜实验G（ASTE）将CO（3-2）发射观测值向3a€2 $$ imes $$ 3a€2（或20kpc $$ imes $$ 20kpcatadistanceof23Mpc）区域的外部棒状螺旋星系NGC986进行分析，这是我们研究的目的（CO-3）（CO-3）。 2）imagerevealedthepresenceofalarge（themajoraxisis14kpcintotallength）gaseousbarfilledwithadensemolecularmediumalongthedarklanesobservedinopticalimages.Thisisthelargesta€？致密gasrichbara€？knowntodate.Thedensegasbar，discoveredinNGC986，couldbeahugereservoirofpossiblea€？fuela€？forfuturestarburstsinthecentralregion，andwesuggestthatstarformationinthecentralregionofNGC986couldstillbeinagrowingphase.WefoundagoodspatialcoincidencebetweentheoveralldistributionsofdensemoleculargastracedbyCO（3-2）andmassivestarformationdepictedbyH $$阿尔法$$。TheglobalCO（3-2 ）亮度，$$ La€？_ {mCO（3-2）} $$，NGC986的确定为（5.4 $$ pm $$ 1.1）$$ imes $$ 10 $$ ^^ 8 $$ Kkms $$ ^ {-1} $$ pc $$ ^ 2 $$。TheCO（3-2）$$ / $$ CO（1-0）在发现积分强度比为0.60 $$ pm $$ 0.13的空间分辨率为44 $ a $？$$ or5kpc，CO（3-2）$$ / $ CO（2-1）的比例为0.67 $$ pm $$ 0.14atabeamsizeof $$ sim $$ 25 $ $ a€？$$或$$ sim $$ 2.8kpc。这些线建议最适中的COlines激发条件（$$ n_ {mH_2} $$$$ simsim $ 10 $$ ^^ {3-4} $$ cm $$ ^ {-3} $$） NGC986中部的inafewkiloparsecsec。

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