Lecture 25

Lecture 25 - Today (Fri.) in Astro 3 Cell phones on...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Today (Fri.) in Today (Fri.) in Astro Astro 3 3 z Cell phones on vibrate… z The Plan: Í Quiz 9 (just published) due tomorrow 11 p.m. Í Today: Chapter 16 “Galaxies and Dark Matter”
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Units of Chapter 16 Dark Matter in the Universe Galaxy Collisions Galaxy Formation and Evolution Black Holes and Active Galaxies The Universe on Very Large Scales
Background image of page 2
16.1 Dark Matter in the Universe Other galaxies have rotation curves similar to ours, allowing measurement of their mass:
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
16.1 Dark Matter in the Universe Another way to measure the average mass of galaxies in a cluster is to calculate how much mass is required to keep the cluster gravitationally bound.
Background image of page 4
16.1 Dark Matter in the Universe Within galaxies need 3 to 10 times more mass to explain rotation curves. Galaxy clusters need 10 to 100 times more mass. So there is a lot of dark matter between galaxies.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
16.1 Dark Matter in the Universe A galaxy interacting with an unseen neighbor – a “dark galaxy”?
Background image of page 6
16.1 Dark Matter in the Universe Between galaxies in clusters: Lots of mass seen in tenuous superhot gas
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 25

Lecture 25 - Today (Fri.) in Astro 3 Cell phones on...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online