8/6/2019 Galactic Center Slides

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

radio view of galactic center ( = 90 cm), 2.8 x 0.8, VLA

RADIO

GC

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

X-ray view of galactic center (Chandra)

X-ray

0.8o

(400Lj)

GC

before CHANDRA :no sensitivity of observations of GC

8/6/2019 Galactic Center Slides

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

X-ray view of galactic center, 2 x 0.8 (Chandra)

X-ray

Sgr A = HII complex DB00-6 = foreground object

Sgr B = MC complex Sgr B2 = GMC Sgr C = X reflection nebula 1E 1740.7-2942 = microquasar (bh)

DB01-42 + DB00-58 = young star cluster 1E 1743.1-2943 = compact X-source, X-binary ? (n**)

GC

8/6/2019 Galactic Center Slides

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

mid-IR view of galactic center, 2 x 0.8, NASA

mid-IR

GC

8/6/2019 Galactic Center Slides

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

composite view of X (blue), mid-IR (green), radio (red)

Composite

GC

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central pc

IR (VLT)massive star cluster; D = 1 Lj

X (Chandra)

hot emitting gas - shocked winds

The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

8/6/2019 Galactic Center Slides

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2002 :

S2 approaches Sgr A*

by 10-20 mas

determination of

position and mass

of Sgr A*

S 2 =

blue star (B1V)

r=5 Ld 17 Lh (90 AU)

disruption at r= 16 Lm

P = 15.2 a

e = 0.88; i = -48 deg

The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

Neighbours to Sgr A*

v(Sgr A*) ) 20 km/s

8/6/2019 Galactic Center Slides

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

Neighbours to Sgr A*

8/6/2019 Galactic Center Slides

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

Neighbours to Sgr A*

8/6/2019 Galactic Center Slides

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

Neighbours to Sgr A*

8/6/2019 Galactic Center Slides

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

Neighbours to Sgr A*

8/6/2019 Galactic Center Slides

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

Neighbours to Sgr A*

2002 :

S2 approaches Sgr A*by 10-20 mas

P = 15.2 0.6 a

elliptical Kepler orbit e = 0.88

v(max) = 5.000 km/s

a = 5.5 Ld

M = 3.7 1.5 106 MS

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The Multiwavelength Galactic Center

ERAC Congress 2009

Yasmin A. Walter

September 2009

Neighbours to Sgr A*

2002 :

S2 approaches Sgr A*by 10-20 mas

P = 15.2 0.6 a

elliptical Kepler orbit e = 0.88

v(max) = 5.000 km/s

a = 5.5 Ld

M = 3.7 1.5 106 MS

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