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Published byBeatrice York Modified over 6 years ago
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LARGE PICTURE OF THE GALACTIC CENTER STUDIED BY H3+:
HIGH IONIZATION RATE, PREVAILING WARM AND DIFFUSE GAS, AND NON-ROTATING EXPANDING MOLECULAR RING Takeshi Oka, Department of Astronomy and Astrophysics and Department of Chemistry, The Enrico Fermi Institute, University of Chicago, Thomas R. Geballe, Gemini Observatory Nick Indriolo, Department of Physics and Astronomy, Johns Hopkins University Miwa Goto, Universitäts-Sternwarte München, Germany June 18, 2013, Columbus meeting
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The Longitude – Velocity (l – v) Diagram
Face-on view v Rotating ring Expanding and Rotating Expanding ring Sun
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The Story of Two Rings Rotating Molecular Ring (RMR)
Expanding Molecular Ring (EMR) OH HI OH Sgr A Kaifu et al. 1972 13CO 120 pc Ring Bolton et al. 1964 Rougoor & Oort 1960 Oort 1977 Bally et al. 1987 Sofue 1995 H2CO Scoville 1972 Kormendy & Kennicutt, 2004 Binney et al. 1991 Athannasoula 1992 Rodriguez-Fernandez et al. 2006 Sofue 1995
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47 Stars for H3+ Spectroscopy
140 pc East B2 B1 140 pc West D λ C A* α κ ι δ θ γ β
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Symmetric (l – v) Diagram → Purely Expanding Ring
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Sofue 1995, PASJ, 47, 551
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Expanding Ring cannot be explained by Gravitation
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RMR of Dense Gas + EMR of Diffuse Gas
Double Ring RMR of Dense Gas + EMR of Diffuse Gas ~100 pc km/s ~140 pc km/s (1055 – 1056 erg) Kaifu et al. (4 × 1054, 2 × 1055 erg) Scoville (2 × 1054 erg) Sofue
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