COURSE DESCRIPTION
G8002: EXTRAGALACTIC ASTRONOMY, Spring 2008
Prof. Arlin Crotts
The Universe is much bigger than it was 25 years ago; suddenly we have many
more ways of investigating the physical nature of the Cosmos.
Consequently, we are answering some basic questions.
This is due in part to major advances in the technology of astronomical
observation, but due as well to new cross-fertilization between astrophysics
and particle physics.
Additionally, there are many clever ideas that have cropped up recently due to
neither effect; maybe more people are simply more excited about cosmology these
days.
This course deals with extragalactic objects in a cosmological context, both as
probes of cosmological models and as evolving objects over cosmic time.
Many new observations relate to both aspects.
The upshot of all these recent developments is that no textbook exists that
covers the whole, current field.
Extragalactic Astronomy and Cosmology by Schneider summarizes galaxies
and active galactic nuclei in a cosmological context.
In truth, much of the material is too recent to be found in any textbook.
Much material will only be covered in the lecture notes (photocopies of the
lecture viewgraphs).
To accomodate the more recent material, about 10% of the course will consist
of a "journal club" where members of the class report (for about 20 minutes at
a time) on papers that interest them.
These are selected from the list at the back of this course description (or
choose your own! - consult with Dr. Crotts first).
Depending on class size, each student will present two or three of these during
the semester.
Dr. Crotts will lecture the bulk of the remaining time (expect some guest
lecturers for some of special topics); there will be a final which counts for
50% of the course grade, and a short midterm quiz.
A few problem sets will also be assigned.
Attendance is important!
Course Outline
- I. Thumbnail History and Gravitational Theory
- A. Data and Paradigm Shifts in Ancient Astronomy
- B. Solar System and Distant Stars
- 1. Copernicus and Heliocentric Universe
- 2. Bruno and Cosmological Principle
- 3. Interstellar Distances
- C. Island Universe
- 1. Galileo
- 2. Herschel
- 3. Wright/Kant
- 4. Kapteyn
- 5. Shapley
- D. Theories of Gravitation
- 1. Newtonian Cosmology
- a. No Static, Homogeneous, Massive Solution
- b. Birkoff's Approximation
- 2. General Relativity
- a. Principle of Equivalence
- b. Tensors
- c. Curvature, Parallel Transport, Connection Coeff's
- d. Einstein Field Equations
- e. Stress/Energy Terms
- i. Normal Matter: "Dust"
- ii. Pressure/Radiation
- iii. Cosmological Constant
- iv. Quintescence and Equation of State
- f. Robertson-Walker Metric
- g. Friedmann Equations
- h. Cosmological Models/Parameters
- E. Galaxian Universe
- 1. Curtis/Shapley Debate
- 2. Hubble
- a. Extragalactic Distance Scale
- b. Redshift/Distance Relation
- II. Extragalactic Menagerie
- A. Galaxies
- 1. Luminosity Function
- 2. Morphology
- a. Environmental dependence
- b. Mass dependence
- 3. Kinematic/Surface Brightness Regularities
- a. Spiral Arm Surface Brightness and Tully-Fisher Law
- b. Elliptical Core Surface Brightness and D_n vs. sigma
- 4. Evidence for Galaxian Dark Matter
- a. Solar Neighborhood Measurements
- b. Milky Way Rotation
- c. LMC Dynamics
- d. Spiral Rotation Curves
- e. Disk Stability
- f. Elliptical Masses
- i. Stellar Velocity Dispersion
- ii. Planetary Nebulae
- iii. Globular Clusters
- g. Dwarf Galaxies
- h. MACHO searches
- 5. Radio Properties & Types
- 6. Infrared Properties
- 7. High Energy Emission
- B. Active Galactic Nuclei
- 1. Seyfert Galaxies
- a. Type I
- b. Type II
- c. Unified Model
- 2. BL Lacs
- 3. Quasars
- C. Lyman-alpha Clouds
- 1. Low-redshift Identification
- 2. High-redshift Nature
- D. Intergalactic Medium
- 1. Gunn-Peterson Test
- a. neutral H
- b. He II
- c. He I
- 2. X-ray Background
- E. Gamma-Ray Bursts
- F. Highest Energy Cosmic Rays
- III. Expanding Universe
- A. Tests for Cosmological Expansion
- 1. Surface Brightness versus Redshift
- 2. Temperature versus Redshift
- 3. Foreground/Background Pair Redshifts
- 4. Gravitational Lensing
- B. Distance Ladders [Jacoby et al. 1992]
- 1. Local Kinematic Distance Indicators
- a. Parallax
- b. Moving Cluster Method
- c. Statistical Proper Motion
- 2. Stellar Indicators
- a. Main Sequence Photometry
- b. RR Lyrae Variable Stars
- c. Delta Cephei/W Virginis stars
- d. Novae
- e. Supernovae
- 3. Cluster/Nebular Indicators
- a. H II Regions
- b. Globular Clusters
- 4. Galaxian Indicators
- a. Brightest Cluster Galaxies
- b. Surface Brightness Fluctuations
- c. Tully-Fisher Relation
- d. D_n - sigma Relation
- e. Fundamental Plane
- 5. Possible Systematic Errors
- a. Observational Selection Biases
- i. Malmqvist Bias
- ii. Scott Effect
- iii. Object Confusion
- aa. Crowding
- bb. Misidentification
- b. Galaxian Evolution
- c. Deviations from Hubble Flow
- 6. Hubble Constant Measurements
- 7. Quasar Gravitational Lensing Determinations
- C. Cosmological Tests
- 1. Standard Candles
- a. Brightest Galaxies
- b. High-redshift Tully-Fisher/Faber-Jackson Relation
- c. Supernovae
- 2. Standard Rulers
- a. Radio Galaxies
- b. Void Spacing
- 3. Population Number Density
- 4. Alcock/Paczynski theta(z) versus dz Test
- D. Tests for Homogeneity and Isotropy
- 1. Radio Source Counts
- 2. Infrared Source Counts
- 3. X-ray Background
- 4. Microwave Background
- 5. Alignment Anisotropy
- IV. Large Scale Structure
- A. Galaxy-galaxy Clustering
- 1. Two-point Clustering
- 2. Power Spectrum
- 3. Three-point Measures and Bispectrum
- 4. Other Measures
- B. Galaxy Clusters
- 1. Cluster Classification
- 2. Galaxy Type versus Cluster Environment
- 3. Hot Gas in Clusters
- 4. Dark Matter in Galaxian Systems
- a. Small Groups
- b. Rich Clusters
- 5. Cluster-cluster Two-point Function
- C. Galaxy Superclusters
- D. Voids
- E. Bulk Motions
- F. Large Scale Perturbation Spectrum
- G. Early Structure Formation
- 1. Quasars
- 2. Galaxies
- a. High Redshift Carbon Monoxide
- b. Damped Ly alpha
- H. Non-linear Growth
- 1. Hydrodynamic Effects
- 2. Hot Dark Matter
- 3. Cold Dark Matter
- 4. Cosmic Strings
- I. Biasing
- V. Galaxy Formation
- A. Overview of Gravitational Collapse
- 1. Quick Review of Linear Relativistic Theory
- 1. Press-Schecter Formalism
- B. Hydrodynamic Collapse
- 1. Jeans Mass
- 2. Fragmentation Processes
- 3. Hydro/gravitational simulation
- C. Spheroidal Component Formation
- D. Disk Formation
- E. Galaxy/IGM Feedback
- VI. Galaxy Evolution
- A. Lookback Time
- B. Stellar Population Synthesis
- C. Observed Samples
- 1. Field Galaxies
- a. HDF, HDFS
- b. CFH sample
- c. SDSS
- d. Lyman Dropout
- e. COMBO 17
- f. DEEP
- ....
- 2. Cluster Galaxies
- VII. Reprise
- A. Dark Matter Constraints
- 1. Baryonic Matter
- 2. Low-mass Neutrinos
- 3. Cold Dark Matter
- 4. Axions
- 5. Decaying Massive Particles
- 6. Massive Black Holes
- 7. Mirror Matter, etc.
- B. Cosmic Time
- 1. Cosmochronology
- 2. Globular Cluster Ages
- 3. Omega, Lambda and H_0
- C. Topology of the Universe
- D. Anthropic Principle
APPROXIMATE TIMELINE (please don't hold us to this!):
Week 1: I.A - I.C
Week 2: I.D
Week 3: I.E - II.A
Week 4: II.A - II.B
Week 5: II.C - II.D
Week 6: II.E - II.F
Week 7: III.A
Week 8: III.B
Week 9: III.C - III.D
Week 10: IV
Week 11: V
Week 12: VI
Week 13: VII
REQUIRED TEXTS (on reserve and in the Columbia bookstore):
Extragalactic Astronomy and Cosmology
Peter Schneider 2006 (Springer, ISBN-10 3-540-33174-3, hardcover).
We will skip much of Chapter 2 on the Galaxy, and other sections will be taken
in a somewhat different order that presented in the book.
Nonetheless this is a good representation of the overall material that will be
covered in the course.
Schneider pays perhaps more attention to gravitational lensing than we are
likely to (not surprising given Schneider's interests), but we will discuss
lensing at several opportunities.
BACKUP TEXTS (on reserve in the 8th floor Pupin Library):
Galaxies and Cosmology
Françoise Combes, Patrick Boissé, Alain Mazure and Alain Blanchard 2004
(Springer, ISBN 3-540-41927-6, hardcover).
We will discuss chapters on the classification and morphology of galaxies,
kinematics and masses of galaxies, interactions between galaxies, extragalactic
radio sources, quasars and other active galactic nuclei, quasar
absorption-line systems, the universe as a whole, and cosmology.
The chapters on large scale structure and on cosmology overlap somewhat with
material covered in Astronomy G6005 Physical Cosmology, while the
chapters on the structure of elliptical, spiral and barred galaxies overlap
with Astronomy G6003 Galactic Structure and the interstellar medium is
the topic of both G6003 and G6002 Interstellar Medium.
Modern Cosmology Scott Dodelson 2003 (Academic Press, ISBN
0-12-219141-2, hardcover).
Many of you took Astro G6005 and presumably have this book, which does a better
job than Combes et al. in describing classical cosmological tests as they
relate to using extragalactic objects to probe cosmological models.
Much of this material is also covered in class notes.
Galaxies in the Universe: An Introduction Linda S. Sparke and
John S. Gallagher 2000 (Cambridge, 0-521-59740-4, paperback)
This is presented at the upper-undergraduate level, and would be helpful here
if the student needs a quick introduction or refresher in the astronomical
background to the study of galaxies.
The book covers basic astrophysics, multiwavelength observations, and some
theoretical concepts, in the following chapters:
mapping our Milky Way,
orbits of the stars,
the local group,
spiral and S0 galaxies,
ellipticals,
large-scale galaxian distribution,
active galactic nuclei and early history of galaxies.
REQUIRED ARTICLES:
"Cosmological Applications of Gravitational Lenses"
R.D. Blandford, R. Narayan 1993, Ann. Rev. Astron. Astrop., 30, 311.
"A Critical Review of Selected Techniques for Measuring Extragalactic Distances"
G.H. Jacoby, D. Branch, R. Ciardullo, R.L. Davies, W.E. Harris, M.J. Pierce,
C.J. Pritchet, J.L. Tonry, D.L. Welch 1992, Proc. Astron. Soc. Pac., 104, 570.
REFERENCES FOR DISCUSSION: (coming soon...)