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H 2 S 2. March 28-31, 1966, APS Durham, NC. April 22, 1966, Invitation to give a seminar. October, 1970. Scrutiny of the Central Parsec of the Galactic Center by Infrared Spectra of H 3 + and 13 CO: GCIRS 3 and GCIRS 1W. Miwa Goto, Max-Planck-Institute for Astronomy, Heidelberg - PowerPoint PPT Presentation
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October, 1970
H2S2
March 28-31, 1966, APS Durham, NC
April 22, 1966, Invitation to give a seminar
Scrutiny of the Central Parsec of the Galactic Center by Infrared Spectra of H3
+ and 13CO: GCIRS 3 and GCIRS 1W
66th OSU International Symposium, June 21, 2011
Miwa Goto, Max-Planck-Institute for Astronomy, Heidelberg Tomonori Usuda, Subaru Telescope, HiloThomas R. Geballe, Gemini Observatory, Hilo Farhad Yusef-Zadeh, Northwestern University, Evanston Nick Indriolo, and Ben J. McCall, University of Illinois at Urbana-Champaign, Urbana Takeshi Oka, University of Chicago, Chicago
Harvey Liszt, National Radio Astronomy Observatory
α+
λε+ ε-η+
θ-
θ+
δ+
30 pc
Oka, Geballe, Goto, Usuda, McCall, 2005, ApJ, 632, 882GCS 3-2
Goto, Usuda, Nagata, Geballe, McCall, Indriolo,Suto, Henning, Morong, Oka, 2008, ApJ, 688, 306
, Geballe, Oka, 2010, ApJ, 709, L70
T ~ 250 Kn < 100 cm-3
L > 2.2 105 cm/s = 2 10-15 s-1 L > 35 pc
N. Z. Scoville, 1972 T. Sawada et al. 2001
The Expanding Molecular RingT. Sawada et al. 2004
Molecular face-on view of the GC
R ~ 180 pc
130 pc
101 pc
Reid, Menten, Zheng, Brunthaler, Xu, ApJ, 2009
J. Kormendy & R. C. Kennicutt, 2004, ARA&A, 42, 603
The Central Cluster8.4” 0.33 pc
The ISAAC L-band image of the Galactic center showing most of the named sources (from Viehmann et al. 2005)
H3+ and 13CO spectra toward GCIRS 3 and GCIRS 1W
Warm and diffuse gas
(3,3)
(2,2)
(1,1)
27 days361 K
H3+ and 13CO spectra toward GCIRS 3 and GCIRS 1W
Velocity profiles and radial location of gas
Subtract spiral arms
Expanding Mol. Ring
Inner Molecular gas
140 km s-1
Dense cloud near Sgr A* toward GCIRS 3
N(1,1) = 1.89 ± 0.31 cm-2 N(2,2) = 2.05 ± 0.57 cm-2 N(3,3) = 2.78 ± 0.30 cm-2
T ~ 300 K
Ionization rate
L = 2 kL N(H3+) (nC/nH)SV RX / f(H2)
1.8 ×10-9 cm3/s 1.6 ×10-4 1
1.0 ×1015 cm-2 3
L = 2 ke N(H3+) (nC/nH)SV RX / f(H2)
~ 1700 cm s-1
if L = 0.5 pc, = 1.1 10-15 s-1
Ubiquity of H3+
Sgr A* to 30 pc East
30 pc
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
Goto, et al. 2008, ApJ, 688, 306