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16 April 2024

» arxiv » 1105.5486

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A 100-parsec elliptical and twisted ring of cold and dense molecular clouds revealed by Herschel around the Galactic Center
S. Molinari ; J. Bally ; A. Noriega-Crespo ; M. Compiègne ; J.P. Bernard ; D. Paradis ; P. Martin ; L. Testi ; M. Barlow ; T. Moore ; R. Plume ; B. Swinyard ; A. Zavagno ; L. Calzoletti ; A.M. Di Giorgio ; D. Elia ; F. Faustini ; 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 ; J.Z. Li ; S.D. Lord ; L. Morgan ; F. Motte ; F. Schuller ; G.S. Stringfellow ; J.C. Tan ; M. A. Thompson ; D. Ward-Thompson ; G. White ; G. Umana ;
Date:	27 May 2011
Abstract:	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 3x10^7 solar masses 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 parsecs is deduced. The major axis of this 100-pc ring is inclined by about 40 degrees 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 x_2 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.
Source:	arXiv, 1105.5486
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