The Structure of Our Galaxy  -- The Milky Way
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The Structure of Our Galaxy -- The Milky Way The Spiral Structure of the Milky Way Spiral Arm Tracers Hot OB-type stars H II regions Supergiants Young clusters Dust Galactic Bulge and Galactic Center (nucleus) Obscured by > 30 mags of extinction by dust The infrared view 25 microns

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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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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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Inflow of gases into Sgr A

Radio view

Sgr A – the galactic center

Massive black hole

> 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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A major asymmetry in the Thick Disk Milky Way

Possible Causes:

A triaxial thick disk

Debris from a galactic merger

Interaction with the bar in the disk


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