A 100 pc ELLIPTICAL AND TWISTED RING OF COLD AND DENSE MOLECULAR CLOUDS REVEALED BY HERSCHEL AROUND THE GALACTIC CENTER
A 100 pc ELLIPTICAL AND TWISTED RING OF COLD AND DENSE MOLECULAR CLOUDS REVEALED BY HERSCHEL AROUND THE GALACTIC CENTER
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DOI：
10.1088/2041-8205/735/2/l33
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发表时间：
2011-05
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通讯作者：
S. Molinari;J. Bally;A. Noriega-Crespo;M. Compiègne;J. Bernard;J. Bernard;D. Paradis;P. Martin;L. Testi;L. Testi;M. Barlow;T. Moore;R. Plume;B. Swinyard;A. Zavagno;L. Calzoletti;A. D. Giorgio;D. Elia;F. Faustini;P. Natoli;P. Natoli;M. Pestalozzi;S. Pezzuto;F. Piacentini;G. Polenta;D. Polychroni;E. Schisano;A. Traficante;M. Veneziani;C. Battersby;M. Burton;S. Carey;Y. Fukui;Jingjun Li;S. Lord;L. Morgan;F. Motte;F. Schuller;G. Stringfellow;J. Tan;M. Thompson;D. Ward-Thompson;G. White;G. Umana
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作者：
S. Molinari;J. Bally;A. Noriega-Crespo;M. Compiègne;J. Bernard;J. Bernard;D. Paradis;P. Martin;L. Testi;L. Testi;M. Barlow;T. Moore;R. Plume;B. Swinyard;A. Zavagno;L. Calzoletti;A. D. Giorgio;D. Elia;F. Faustini;P. Natoli;P. Natoli;M. Pestalozzi;S. Pezzuto;F. Piacentini;G. Polenta;D. Polychroni;E. Schisano;A. Traficante;M. Veneziani;C. Battersby;M. Burton;S. Carey;Y. Fukui;Jingjun Li;S. Lord;L. Morgan;F. Motte;F. Schuller;G. Stringfellow;J. Tan;M. Thompson;D. Ward-Thompson;G. White;G. Umana
用赫歇尔卫星上的远红外照相机获得的银河系中央分子区冷尘埃的热图像显示，银河系中心有一个103 × 107 M的稠密冷云环。使用一个简单的玩具模型，推导出具有100和60 pc的半长轴的椭圆形状。这个100 pc环的长轴相对于天空平面倾斜约40°，并且垂直于银河棒的长轴。100 pc环似乎跟踪系统的稳定x2轨道预测的禁止银河系的潜力。相对于环的几何对称中心位移。环是扭曲的，它的形态表明，平坦的比率为2的银河系的潜力，这是在良好的协议，从2MASS数据导出的隆起平坦比率。
Thermal images of cold dust in the Central Molecular Zone of the Milky Way, obtained with the far-infrared cameras on board the Herschel satellite, reveal a ∼3 × 107 M☉ ring of dense and cold clouds orbiting the Galactic center. Using a simple toy model, an elliptical shape having semi-major axes of 100 and 60 pc is deduced. The major axis of this 100 pc ring is inclined by about 40° with respect to the plane of the sky and is oriented perpendicular to the major axes of the Galactic Bar. The 100 pc ring appears to trace the system of stable x2 orbits predicted for the barred Galactic potential. Sgr A⋆ is displaced with respect to the geometrical center of symmetry of the ring. The ring is twisted and its morphology suggests a flattening ratio of 2 for the Galactic potential, which is in good agreement with the bulge flattening ratio derived from the 2MASS data.