Formation of Galactic Center Magnetic Loops

Machida Mami; Matsumoto Ryoji; Nozawa Satoshi; Takahashi Kunio; Fukui Yasuo; Kudo Natsuko; Torii Kazufumi; Yamamoto Hiroaki; Fujishita Motosuji; Tomisaka Kohji

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Formation of Galactic Center Magnetic Loops

机译：银河系中心磁环的形成

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AsurveyofthemolecularcloudsintheGalaxywiththeNANTENmmtelescopehasdiscoveredmolecularloopsinthegalacticcenterregion.Theyshowmonotonicgradientsoftheline-of-sightvelocityalongtheloopsandlargevelocitydispersionstowardstheirfoot-points.ItissuggestedthattheseloopscanbeexplainedintermsofabuoyantriseofmagneticloopsduetoaParkerinstability.Wecarriedoutglobalthree-dimensionalmagneto-hydrodynamicsimulationsofthegasdiskinthegalacticcenter.ThegravitationalpotentialwasapproximatedbyanaxisymmetricpotentialproposedbyMiyamotoandNagai(1975,PASJ,27,533).Attheinitialstate,weassumedawarm($$sim$$a€‰10$$^4$$K)gastorusthreadedbyazimuthalmagneticfields.Self-gravityandradiativecoolingofthegaswereignored.Wefoundthatbuoyantlyrisingmagneticloopsareformedabovethedifferentiallyrotating,magneticallyturbulentdisk.ByanalyzingtheresultsofglobalMHDsimulations,weidentifiedindividualloops,about180intheupperhalfofthedisk,andstudiedtheirstatisticalproperties,suchastheirlength,width,height,andvelocitydistributionsalongtheloops.Thetypicallengthandheightofaloopare1kpcand200pc,respectively.Theline-of-sightvelocitychangeslinearlyalongaloop,andshowslargedispersionsaroundthefoot-points.Numericalresultsindicatethatloopsemergepreferentiallyfromtheregionwherethemagneticpressureislarge.WearguethatthesepropertiesareconsistentwiththoseofmolecularloopsdiscoveredbyNANTEN.

机译：AsurveyofthemolecularcloudsintheGalaxywiththeNANTENmmtelescopehasdiscoveredmolecularloopsinthegalacticcenterregion.Theyshowmonotonicgradientsoftheline-的-sightvelocityalongtheloopsandlargevelocitydispersionstowardstheirfoot-points.ItissuggestedthattheseloopscanbeexplainedintermsofabuoyantriseofmagneticloopsduetoaParkerinstability.Wecarriedoutglobalthree-dimensionalmagneto-hydrodynamicsimulationsofthegasdiskinthegalacticcenter.ThegravitationalpotentialwasapproximatedbyanaxisymmetricpotentialproposedbyMiyamotoandNagai（1975，PASJ，27533）.Attheinitialstate，weassumedawarm（$$ SIM $$一个€‰10 $$ ^ 4 $$ K）gastorusthreadedbyazimuthalmagneticfields。我们忽略了气体的自重和辐射冷却。我们发现，在差动旋转的磁湍流盘上方形成了活跃的电磁环。通过分析全球MHD模拟的结果，我们确定了单个环，大约180的整个圈数，长度，长度，宽度以及其特性研究了典型的长度和高度分别为1kpc和200pc。视线速度沿整个直线呈线性变化，并在脚点附近显示出较大的分散。数值结果表明，回路最好从电磁压力较大的区域出现。

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《PASJ: Publications of the Astronomical Society of Japan》 |2009年第3期|共页
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Machida Mami; Matsumoto Ryoji; Nozawa Satoshi; Takahashi Kunio; Fukui Yasuo; Kudo Natsuko; Torii Kazufumi; Yamamoto Hiroaki; Fujishita Motosuji; Tomisaka Kohji;
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1. Discovery of Molecular Loop 3 in the Galactic Center:Evidence for a Positive-Velocity Magnetically Floated Loop towards L = 355°-359° [J] . Motosuji FUJISHITA, Kazufumi TORII, Natsuko KUDO, PASJ: Publications of the Astronomical Society of Japan . 2009,第5期

机译：在银河中心发现分子环3：正向磁浮环向L = 355°-359°的证据
2. Discovery of Molecular Loop 3 in the Galactic Center: Evidence for a Positive-Velocity Magnetically Floated Loop towards L= 355$^circ$a€“359$^circ$ [J] . Fujishita Motosuji, Torii Kazufumi, Kudo Natsuko, PASJ: Publications of the Astronomical Society of Japan . 2009,第5期

机译：在银河中心发现分子环3：正向磁浮环朝L = 355 $ ^ circ $ a€“ 359 $ ^ circ $的证据
3. Formation of Galactic Center Magnetic Loops [J] . Mami MACHIDA, Ryoji MATSUMOTO, Satoshi NozAwA, PASJ: Publications of the Astronomical Society of Japan . 2009,第3期

机译：银河系中心磁环的形成
4. Three-Dimensional Global MHD Simulations of the Magnetic Loop Structures in our Galactic Center [C] . Mami Machida, Ryoji Matsumoto, Satoshi Nozawa, Workshop on the Galactic Center: a Window to the Nuclear Environment of Disk Galaxies . 2011

机译：我们银河系中心磁环结构的三维全局MHD模拟
5. Surveys of the Galactic center and the nature of the Galactic center lobe [D] . Law, Casey James 2007

机译：银河系中心和银河系中心瓣的性质的调查
6. STUDIES OF THE GALACTIC CENTER. IV. ON THE TRANSPARENCY OF THE GALACTIC STAR CLOUDS [O] . Harlow Shapley 1929

机译：银河中心研究。 IV。论银河星云的透明度
7. Formation of Galactic Center Magnetic Loops [O] . Mami Machida, Satoshi Nozawa, Kohji Tomisaka 2000

机译：银河系中心磁环的形成

Formation of Galactic Center Magnetic Loops

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