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The Structure of Our Galaxy -- The Milky Way PowerPoint Presentation
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The Structure of Our Galaxy -- The Milky Way - PowerPoint PPT Presentation


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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. Neutral Hydrogen – H I and the rotation curve of the Galaxy. 21 cm emission line in the radio.

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Presentation Transcript
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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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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

Possible Causes:

A triaxial thick disk

Debris from a galactic merger

Interaction with the bar in the disk