The Structure of Our Galaxy -- The Milky Way
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Transcript of The Structure of Our Galaxy -- The Milky Way
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The Structure of Our Galaxy -- The Milky Way
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The Spiral Structure of the Milky Way Spiral Arm Tracers
Hot OB-type stars
H II regions
Supergiants
Young clusters
Dust
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Neutral Hydrogen – H I and the rotation curve of the Galaxy
21 cm emission line in the radio
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Rotation Curve of the Galaxy
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Galactic Bulge and Galactic Center (nucleus)
Obscured by > 30 mags of extinction by dust
The infrared view
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25 microns 60 microns
100 microns
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Radio view
Inflow of gases into Sgr A
Sgr A – the galactic center
Massive black hole
> 106 Msun
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Multiwavelength composite image
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The Black Hole at the Galactic Center
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Massive Compact Object 4 x 106 Msun
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Formation and Evolution of the Galaxy
Gravitational Collapse of a large cloud
Clues – age and kinematics of different populations
But … increasing evidence for galactic mergers
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The Sagittarius Dwarf Galaxy – current merger with the Milky Way
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A major asymmetry in the Thick DiskPossible Causes:
A triaxial thick disk
Debris from a galactic merger
Interaction with the bar in the disk