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