Astronomy 113, Session 003
Review Topics on Exam 3, which takes place on April 26, 2006
· Chap. 25 --- Our Galaxy
o Sun’s location in the Galaxy; interstellar extinction; globular cluster
o Shape of the Galaxy; disk, central bulge, and halo
o Spiral arms; radio observation at 21 cm; HI; star forming regions
o Nature of spiral arms; density waves
o Dark Matter; rotation curve
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· Chap. 26 --- Galaxies
o Distance to other galaxies; Cepheid variables
o Galaxy classifications; spiral, barred, elliptical, irregular galaxies
o Distance ladder; parallax, spectroscopic parallax, RR Lyrae variable, Cepheid variable, Type 1a supernova
o The Hubble Law; redshift of galaxies
o Galaxy clusters; superclusters
o Distribution of galaxies; filaments, voids
o Galaxy collision; tidal force
o Dark matter; gravitational lensing; rotaton curve
o Galaxy formation; spiral and elliptical galaxies
· Chap. 27 --- Quasars, Active Galaxies and Gamma-Ray Bursters
o Quasars; redshift; distant distribution
o Quasars are centers of active galaxies
o Seyfert Galaxies; radio galaxies; jets; synchrotron radiation
o AGN (active galactic nuclei); blazers; super-luminous motion
o Super-massive black hole; Eddington limit
o Unified theory of active galaxies
o Gamma-ray Bursters
· Chap. 28 --- Cosmology: The Origin and Evolution of the Universe
o Olbers’s paradox
o Expanding universe; cosmological redshift
o Big Bang; Age of the Universe; Cosmic light horizon
o Cosmic microwave background radition
o Mass density; evolution of mass density
o Era of recombination; primordial fireball
o Three types of universe: close, flat, and open; our universe is flat
o Dark energy