Warm and Diffuse Gas and High Ionizzation Rate Near the Galactic Center
from 140 pc West to 85 pc East of Sgr A*
66th OSU International Symposium, June 21, 2011
Takeshi Oka, Chris MORONG, University of Chicago, Chicago Tom Geballe, Gemini Observatory, Hilo Nick Indriolo, Ben McCall, University of Illinois at Urbana-Champaign, Urbana Miwa Goto, Max-Planck-Institute for Astronomy, HeidelbergTomonori Usuda, Subaru Telescope, Hilo
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
Two sightlines with remarkable H3+ spectrum
α 140 pc West
ι 85 pc East
Geballe and Oka, 2010, ApJ, 709, L70-73
0 – 30 pc EastQuintuplet, α, ι
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
“alpha”, 140 pc West, 2.7 pc below
Alpha
Geballe and Oka, ApJ 709, L70-73 (2010)
H. Liszt, ApJL, 82, 495 (1992)
13CO
Sgr E, 144 pc West, 20 pc above
S
Sgr ESgr E 3 kpc SA
Alpha, EMR, warm and diffuse
Geballe and Oka, ApJ 709, L70-73 (2010)
N(1,1) = 1.86 (12) 1015 cm-2 N(3,3) = 1.33 (27) 1015 cm-2
15.0715.0)1,1(
)3,3(
N
N
T ~ 300 K
Goto et al., PASJ, 64, L13-17 (2010)
α
β
α 138.7 pc W 2.65 pc below
β 133.4 pc W 4.20 pc below
α+ 138.0 pc W 6.12 pc below
α+
Three stars within 7 pc of angular distance
Three stars within 7 pc of angular distance
+
+
α
βα+
Geballe and Oka, ApJ 709, L70-73 (2010)
Iota, the Monster
“iota”, 85 pc East, Sgr B
H3+ in Iota versus H2O+ and 13CH+ in Sgr B2
Peter SchilkeP. Schilke et al., A&A, 521, L11, 2010
Edith Falgarone
H3+
H2O+
Simple chemistry of H3+: N(H3
+) → ·L
L = 2 ke N(H3+) (nC/nH)SV RX / f(H2)
7.3 ×10-8 cm3/s 1.6 ×10-4 < 1
3.1 ×1015 cm-2 > 3
L > 2.2 ×105 cm/s
L
10-17 s-1 > 7 kpc 10-16 s-1 > 700 pc 10-15 s-1 > 70 pc
0.1!?
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
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
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