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How Do Stars Move through the Galaxy
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Slide 1

The Milky Way

The Milky Way

Our Galactic Home

Slide 2

How Do Stars Move through the Galaxy

Slide 3

Goals

Goals

Structure of our Galaxy.

Its size and shape.

How do stars and things move through it?

Mass and Dark Matter.

The Galactic Center.

Slide 4

The Milky Way

The Milky Way

Stars

Dust

Gaseous Nebulae

Open Clusters

Globular Clusters

Pulsars

Black Holes

How do they all fit together to make our galaxy?

Slide 5

Optical emission from stars and nebulae

Optical emission from stars and nebulae

Slide 6

Near-Infrared stellar emission  copyright E. L. Wright and COBE

Near-Infrared stellar emission copyright E. L. Wright and COBE

Slide 7

Far-Infrared dust emission  copyright E. L. Wright and COBE

Far-Infrared dust emission copyright E. L. Wright and COBE

Slide 8

Radio emission from neutral hydrogen  copyright J. Dickey

Radio emission from neutral hydrogen copyright J. Dickey

Slide 9

X-ray emission from hot gas  copyright S. Digel and ROSAT

X-ray emission from hot gas copyright S. Digel and ROSAT

Slide 10

Gamma-ray emission from pulsars and black holes  copyright NASA

Gamma-ray emission from pulsars and black holes copyright NASA

Slide 11

Where are We?

Where are We?

We arent at the center of the Milky Way.

Where is the center then?

Globular Clusters point the way.

M10 copyright Credner and Kohle

Slide 12

You Are Here

You Are Here

Slide 13

You Are Here

Slide 14

Near-Infrared stellar emission  copyright E. L. Wright and COBE

Near-Infrared stellar emission copyright E. L. Wright and COBE

Slide 15

Galactic Distances

Galactic Distances

How do we know the distance to stars and clusters in our galaxy?

Trigonometric parallax good out to 100 pc.

We believe galaxy is ~30 kpc wide.

How do we know?

Slide 16

Spectroscopic Parallax

Spectroscopic Parallax

If you know how luminous a star REALLY is and how bright it looks from Earth, you can determine how far away it must be to look that faint.

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