Ay102: Interstellar Medium
The class meets Monday, Wednesday & Friday form 1-2pm in Cahill
room 219. The textbookf for the course is Physics of the
Interstellar and Intergalactic Medium by Bruce Draine. I would
recommend that you buy a copy of Draine's book. Below "Chapter"
refers to appropriate chapter in Draine's book. I will make use
of a variety of sources for pedagogy. My internal notes will be
linked to the class website.
Other Useful Books:
Radiative Processes in Astrophysics by George B. Rybicki &
Alan P. Lightman
Quantum Mechanics for Engineers by Leon van Dommelen
Electromagnetic Processes by Robert J. Gould
The Physics of Interstellar Dust by Endkri Krugel
Astrophysics of gaseous nebulae and active galactic nuclei
by Donald E. Osterbrock, Gary J. Ferland
I have provided links to some notes from courses taught elsewhere.
Michigan QM are notes of first
level QM course taught at U. Michigan.
HOMEWORK POLICY: You are free to discuss amongst yourselves. In
fact, much of learning is peer-to-peer. Brain storming is good.
However, true understanding comes from within and so there is a
delicate balance between communal problem solving and deep
contemplation. The latter will stand you in good stead. I suggest
the following approach: do your best to solve the homework. Sometimes
you simply cannot make a headway. Those problems are grist to group
discussions. Please include the sole undergrad in your discussions.
What you submit must your own work (typed, written, programmed,
drawn).
FINAL & MID-TERM EXAMS: These are oral exams (CLOSED BOOK). A master list of
questions (approximately 25 for Mid-Term and 50 for Final) will
be provided several weeks in advance of the exam. You are encouraged
to discuss the solutions to these questions amongst yourselves.
During the exam week, each of you will sign up for a slot. You
arrive 1 hour before the assigned time and pick up a Chinese cookie
from a jar. Each cookie has five lucky numbers (between 1 and 25/50).
You then wend off to a quiet corner and mull through the questions.
You can use a blank notebook to write down and work out your anwers
(but no access to any other material, on- or off-line). [All
relevant constants will be provided]. You then to the examination
room and explain the solutions to the five assigned questions
Typicall, the oral exam lasts 45 minutes. At the end of the exam
period you will be provided with a letter summarizing your performance
in the class.
GRADING FRAMEWORK: The final grade is a weighted
sum with weith of 1/2 for homework, 1/4 each for mid-term and final.
- Introducing the ISM [4 January 2023]
Introduction to ISM
- The Bohr Atom; Schrodinger solution [6 January 2023]
Chapter 7 of Michigan QM
 | 
Bohr Hydrogen (SRK)  | 
- Corrections (Spin-orbit, relativistic); Dirac Solution [9 January 2023]
SRK Notes
  |  
Kastberg's lecture notes
Homework 1 (due 17 January);
- Helium [11 January 2023]
Chapter 8 of Michigan QM
 | 
Helium (SRK)
Additional Material:
Hylleraas solution
- Allkali Elements, Multi-electrons [13 January 2023]
Alkali spectra
 | 
SCF, spin orbitals
 | 
Chapter 9 of Michigan QM
 | 
- L-S Coupling, Hunds rules, Selection Rules
[18 January 2023]
L-S coupling  | 
Terms, Hund's rules
Homework 2 due COB, Jan 24.
- Rate Coefficients
[20 January 2023]
Chapter 6
Pre-requisites: A & B
Coefficients  | 
Maxwell-Boltzmann distribution
- Cross-sections [23 January 2023]
Chapter 2
SRK Notes
- Critical Density, Equilibration [25 January 2023]
Nebulium  | 
Dielectronic
Recombination
Please read
Dispersion Measure (Kulkarni) ahead of next lecture.
Homework 3 due February 2, 2023.
- Atomic Phases of the ISM: The Warm Ionized Medium [27 January 2023]
Warm Ionized Medium
Supplementary Reading:
History of Radio Astronomy  | 
SRK paper on mid-IR fine structure lines
- HII Regions (Stromgren model) [1 February 2023]
Chapter 15
HII Regions
- Thermal Balance of HII regions [3 February 2023]
Chapter 27
Heating & Cooling
- HII regions: Dynamics [6 February 2023]
Chapter 37
Dynamics
- HII regions: Dynamics (continued) [8 February 2023]
- Cosmic Ray: Heating & Ionization [10 February 2023]
Chapter 13.5 & Chapter 40
Cosmic Rays, LISM
- Shocks & Jump Condtions [13 February 2023]
Chapter 36
Presentation
 | 
Jump Conditions
- Supernovae [15 Feburary 2023]
Chapter 29
Notes
- Hot Ionized Medium [17 February 2023]
Chapters 14.9, 34.1 and 34.2  | 
HIM Presentation
- Hyperfine lines , Radiative Transfer [22 February 2023]
Chapter 4.6, 17.3,
Hyperfine Line
  |  
Spin Flip
 | 
Chapter 7, Notes
- Warm & Cold Neutral Medium [24 February 2023]
Chapter 8  |  Notes
- Global ISM Model [27 February 2023]
Chapter 30. Please read the Supplement to see two-phase model
at work.
presentation  | 
Supplement
The additional material required for the
HW4 homework can be found
here
- Molecules [1 March 2023]
Chapter 32  | 
presentation
- Molecules (contd) [3 March 2023]
- Dust-1 [6 March 2023]
- Dust-2 [8 March 2023]
- Dust-3 [10 March 2023]
- FINAL EXAM (17 March 2023)
Master Question List