Astr 328 Midterm Exam Questions (2006 edition)
There will be three questions taken
from this list. You should plan on spending ~ 2-3 bluebook pages
answering each one.
- Why do we need to study relatively distant
galaxies to get a get a measure of the Hubble constant? Why can't we
just use distances to nearby galaxies, where Cepheids give us good
distances, to measure H0?
- Describe several reasons why high redshift
galaxies might look different from galaxies in the local universe.
- Describe the "surface brightness fluctuation"
technique for finding distances to galaxies. Is this technique better
for spirals or ellipticals? Why?
- Write down the Friedmann equation, and describe
each term. Using the Friedmann equation, derive the following
for an Omega=1, Lambda=0 universe.
Explain the test behind the supernova
and the recent results from this project.
- the current age of the Universe
Describe what we mean by "peaks" in the power
the microwave background. What causes these peaks, and what do they
us about the Universe?
Describe how globular cluster ages are
determined, and how these ages constrain the cosmological parameters
which describe the universe. Be specific!
Describe the four classical tests of cosmology,
and what data you might need for each one. Explain which of the tests,
if any, are providing good tests of cosmology today.
Describe the Tully-Fisher relationship (including
its physical implications). Discuss the data you need to measure H0
with Tully-Fisher, and explain how the cluster incompleteness bias can
influence your answer.
Describe the five foundations of modern