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ASTR 1102-002 2008 Fall Semester [Slides from Lecture20]
Joel E. Tohline, Alumni Professor Office: 247 Nicholson Hall [Slides from Lecture20]
![ASTR Fall Semester [Slides from Lecture20]](http://slideplayer.com/slide/13249164/79/images/1/ASTR+Fall+Semester+%5BSlides+from+Lecture20%5D.jpg "Joel E. Tohline, Alumni Professor. Office: 247 Nicholson Hall. [Slides from Lecture20]")
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Chapter 23: Our Galaxy and Chapter 24: Galaxies
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Schematic Illustration
of Our (Milky Way) Galaxy
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Stellar Populations Pop I Pop II Location Galaxy’s disk
Throughout Galaxy’s “halo” Kinematics Circular orbits in the disk Significant motion out of the disk Metallicity High Low
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Stellar Populations Pop I Pop II Location Galaxy’s disk
Throughout Galaxy’s “halo” Kinematics Circular orbits in the disk Significant motion out of the disk Metallicity High Low Age Young Old
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Stellar Populations What about “Pop III” ? Pop I Pop II Location
Galaxy’s disk Throughout Galaxy’s “halo” Kinematics Circular orbits in the disk Significant motion out of the disk Metallicity High Low Age Young Old What about “Pop III” ?
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Stellar Populations We are only able to study and delineate well these different stellar populations in our own MW Galaxy The presumption is that all other galaxies contain these same populations of stars, although the fraction of stars belonging to Pop I vs. Pop II varies from galaxy to galaxy.
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Center of Our Milky Way Galaxy
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Center of Our Milky Way Galaxy
Evidence for a Massive Black Hole at the Center of Our Milky Way Galaxy
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Center of Milky Way Galaxy
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More about Galaxies
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Individual Stars…(early in the semester)
Location in Space Coordinate (angular) position on the sky Distance from Earth Motion through Space Motion across the sky (“proper” motion) Motion toward/away from us (radial velocity) Intrinsic properties Brightness (luminosity/magnitude) Color (surface temperature) Mass Age
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(now let’s discuss)…Individual Galaxies
Location in Space Coordinate (angular) position on the sky Distance from Earth Motion through Space Motion across the sky (“proper” motion) Motion toward/away from us (radial velocity) Intrinsic properties Brightness (luminosity/magnitude) Color (surface temperature) Mass Age
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Individual Galaxies Location in Space
Coordinate (angular) position on the sky
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Individual Galaxies Location in Space
Coordinate (angular) position on the sky Distance from Earth
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Distance Ladder
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Individual Galaxies Location in Space Motion through Space
Coordinate (angular) position on the sky Distance from Earth Motion through Space Motion across the sky (“proper” motion) – None observable! Motion toward/away from us (radial velocity) – Extremely revealing discovery made by Slipher, Hubble, Humason
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Individual Galaxies Location in Space Motion through Space
Coordinate (angular) position on the sky Distance from Earth Motion through Space Motion across the sky (“proper” motion) – None observable! Motion toward/away from us (radial velocity) – Extremely revealing discovery made by Slipher, Hubble, Humason
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Individual Galaxies Location in Space Motion through Space
Coordinate (angular) position on the sky Distance from Earth Motion through Space Motion across the sky (“proper” motion) – None observable! Motion toward/away from us (radial velocity) – Extremely revealing discovery made by Slipher, Hubble, Humason
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Individual Galaxies Location in Space Motion through Space
Coordinate (angular) position on the sky Distance from Earth Motion through Space Motion across the sky (“proper” motion) – None observable! Motion toward/away from us (radial velocity) – Extremely revealing discovery made by Slipher, Hubble, Humason
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Individual Galaxies Location in Space Motion through Space
Coordinate (angular) position on the sky Distance from Earth Motion through Space Motion across the sky (“proper” motion) – None observable! Motion toward/away from us (radial velocity) – Extremely revealing discovery made by Slipher, Hubble, Humason
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