1. Morphology of the Galactic center from the H3+ spectrum:
The 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 20, 2012, Columbus meeting WH06

2. ζ ≥ 2 × 10-15 s-1 High ionization rate and warm and diffuse gas
in the Central Molecular Zone of the Galactic center
revealed from the H3+ spectroscopy
ζ ≥ 2 × s-1
T ~ 250 K, n ≤ 100 cm-3
f > 30%
Oka, Geballe, Goto, Usuda, McCall
2005 ApJ, 632, 882
The Central
Molecular Zone

3. Morphology ≡ Doppler Spectroscopy
Christian Doppler
The Central
Molecular Zone

4. Molecular face-on views of the GC
EMR
Rodríguez-Fernandez et al.
2006
Scoville, 1972
Kaifu et al. 1972
Sawada et al. 2001
Sawada et al. 2004
Bally et al. 2010
Molinari et al, 2011
Kormendy & Kennicutt, 2004, ARA&A

5. 43 stars suitable for the H3+ spectroscopy
Quintuplet Cluster E
Central Cluster B2 B1 D λ C A* α κ ι δ θ γ β

6. We use H3+ in diffuse clouds for morphology Longitude velocity diagramB2 B1 D λ C A* α κ ι δ θ γ β

7. Sofue 1995, PASJ, 47, 551

8. I am scared