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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

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slide1

H2S2

March 28-31, 1966, APS Durham, NC

April 22, 1966, Invitation to give a seminar

October, 1970

slide2

Scrutiny of the Central Parsec of the Galactic Center by Infrared Spectra of H3+ and 13CO: GCIRS 3 and GCIRS 1W

Miwa Goto, Max-Planck-Institute for Astronomy, Heidelberg

Tomonori Usuda, Subaru Telescope, Hilo

Thomas 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

66th OSU International Symposium, June 21, 2011

slide3

T ~ 250 K

n < 100 cm-3

L > 2.2  105 cm/s

 = 2  10-15 s-1 L > 35pc

GCS 3-2

Oka, Geballe, Goto, Usuda, McCall, 2005, ApJ, 632, 882

,  Geballe, Oka, 2010, ApJ, 709, L70

ε+

ε-

η+

λ

α+

θ+

θ-

δ+

Goto, Usuda, Nagata, Geballe, McCall, Indriolo,

Suto, Henning, Morong, Oka, 2008, ApJ, 688, 306

30 pc

slide4

Molecular face-on view of the GC

R ~ 180 pc

101 pc

130 pc

Reid, Menten, Zheng, Brunthaler, Xu, ApJ, 2009

The Expanding Molecular Ring

T. Sawada et al. 2001

T. Sawada et al. 2004

N. Z. Scoville, 1972

slide6

The Central Cluster

8.4” 0.33 pc

The ISAAC L-band image of the Galactic center showing most of the named sources (from Viehmann et al. 2005)

slide7

H3+ and 13CO spectra toward GCIRS 3 and GCIRS 1W

Warm and diffuse gas

(3,3)

(2,2)

361 K

27 days

(1,1)

slide8

H3+ and 13CO spectra toward GCIRS 3 and GCIRS 1W

Velocity profiles and radial location of gas

 140 km s-1

Subtract spiral arms

Expanding Mol. Ring

Inner Molecular gas

slide9

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

slide11

Ionization rate

L = 2 keN(H3+) (nC/nH)SV RX / f(H2)

1.8 ×10-9 cm3/s

1.6 ×10-4

1

L = 2 kLN(H3+) (nC/nH)SV RX / f(H2)

1.0 ×1015 cm-2

3

~ 1700 cm s-1

if L = 0.5 pc, = 1.1  10-15 s-1

slide14

Ubiquity of H3+

Sgr A* to 30 pc East

Goto, et al. 2008, ApJ, 688, 306

30 pc

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