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LARGE PICTURE OF THE GALACTIC CENTER STUDIED BY H 3 + : 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 , - PowerPoint PPT Presentation
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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
June 18, 2013, Columbus meeting
Miwa Goto, Universitäts-Sternwarte München, Germany
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
The Longitude – Velocity (l – v) Diagram
Rotating ring
Expanding ring
Face-on view(l – v) diagram
Sun
v
Expanding and Rotating
The Story of Two RingsRotating Molecular Ring (RMR) Expanding Molecular Ring (EMR)
Bally et al. 1987Sofue 1995
HI13CO120 pc Ring
Binney et al. 1991Athannasoula 1992
Rougoor & Oort 1960Oort 1977
Rodriguez-Fernandez et al. 2006
Kormendy & Kennicutt, 2004
OH Sgr A
Bolton et al. 1964
Kaifu et al. 1972
Scoville 1972
OH
H2CO
Sofue 1995
47 Stars for H3+ Spectroscopy
A*
B1B2D C
E
α
βγδθι
λ
κ
1.00
0.95
0.90
0.85
0.80
0.75
0.70
-200 -150 -100 -50 0 50 100
GCS 4
NHS 21
NHS 25
NHS 42
FMM 361
140 pc West140 pc East
Symmetric (l – v) Diagram → Purely Expanding Ring
Sofue 1995, PASJ, 47, 551
Expanding Ring cannot be explained by Gravitation
Double RingRMR of Dense Gas + EMR of Diffuse Gas
years10140km/s
pc140 6
~100 pc 100 km/s
~140 pc 140 km/s
(1055 – 1056 erg) Kaifu et al.
(4 × 1054, 2 × 1055 erg) Scoville
(2 × 1054 erg) Sofue