LARGE PICTURE OF THE GALACTIC CENTER
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LARGE PICTURE OF THE GALACTIC CENTER STUDIED BY H 3 + : HIGH IONIZATION RATE, PowerPoint PPT Presentation


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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 ,

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LARGE PICTURE OF THE GALACTIC CENTER STUDIED BY H 3 + : HIGH IONIZATION RATE,

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Large picture of the galactic center studied by h 3 high ionization rate

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


Large picture of the galactic center studied by h 3 high ionization rate

The Longitude –Velocity (l – v) Diagram

(l – v) diagram

Face-on view

v

Rotating ring

Expanding and Rotating

Expanding ring

Sun


Large picture of the galactic center studied by h 3 high ionization rate

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

Binney et al. 1991

Athannasoula 1992

Kormendy & Kennicutt, 2004

Rodriguez-Fernandez et al. 2006

Sofue 1995


Large picture of the galactic center studied by h 3 high ionization rate

47 Stars for H3+ Spectroscopy

E

140 pc East

140 pc West

B2

B1

λ

C

D

A*

α

κ

ι

δ

γ

θ

β


Large picture of the galactic center studied by h 3 high ionization rate

Symmetric (l – v) Diagram → Purely Expanding Ring


Large picture of the galactic center studied by h 3 high ionization rate

Sofue 1995, PASJ, 47, 551


Large picture of the galactic center studied by h 3 high ionization rate

Expanding Ring cannot be explained by Gravitation


Large picture of the galactic center studied by h 3 high ionization rate

Double Ring

RMR of Dense Gas + EMR of Diffuse Gas

~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


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