Ay126: Interstellar Medium
There is no single book that can cover both pedagogy and at the
same time the astrophysics of ISM. Draine (Physics of the
Interstellar and Intergalactic Medium) does a very good job on
the latter. I will make use of a variety of sources for pedagogy.
I would recommend that you buy a copy of Draine's book. Below
"Chapter" refers to appropriate chapter in Draine's book.
lists the errata and has problem sets and figures used in the book.
The Physics of Interstellar Dust by Endkri Krugel
Astrophysics of gaseous nebulae and active galactic nuclei
by Donald E. Osterbrock, Gary J. Ferland
Atomic energy levels and Grotrian diagrams, vol. 1-4 by
Stanley Bashkin and John O. Stoner, Jr
Introduction to atomic spectra by Harvey Elliott White
J"orn Wilms, Erlangen-Nuremberg. Nice site of notes related to
high energy astrophysics and atomic processes. Look under teaching
(e.g. Astrophysical Radiation Processes"
collection, particularly good for X-ray astronomy.
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. What you submit must your
own work (typed, written, programmed, drawn).
GRADING FRAMEWORK: Two third will be determined by homeworks. The
remaining one third will be a final exam.
VENUE & TIME: Given COVID-19 all of our classes will be in the
Tuesday & Thursday 2:30-3:55p
The master question list for final exam will be posted close to mid-term exam.
- Introduction (March 30)
From early Universe to present universe.
Dark Matter Simulation (Steinmetz) .
Simulation with gas (Hopkins)
Red is million degrees gas, green is 10^4 to 10^5 K gas and magenta is
- Hydrogen Spectrum; ISM Phases (April 1)
Spectrum of Hydrogen  |
Hydrogen Wave functions (UMich,
Ionization Table & Chart  |
ISM Global n,T  |
Phases & Cosmic Abundance
Recording I  |
- Spectra of Alkali Elements (April 6)
Spin-orbit interaction  |
"spdf" notation  |
Spectra of Alkali Elements
Homework 1 (due April 16)
- The spectrum of Helium (April 8)
Helium atom (SRK)
Quantum Mechanics of the Helium Atom [UMich, Chem461]
Periodic Table [UMich, Chem461]
- Spectroscopic Terms, Hund's Rules, Allowed & Forbidden Lines (April 13)
LL & JJ coupling |
Allowed & Forbidden Lines
Homework 2 (due April 22, 2021)
|  Unix program to
determine spectroscopic terms
Far Infrared & Submillimeter Astronomy (April 15)
IR background  |
Talk on FSL by Stancil  |
Collisional Processes (Chapter 2).
Beginnings of FSL astronomy
- Collisonal Coefficients, Oscillator Strength, Critical Density (April 20)
Chapters 2, 6, 17
- April 22
- WNM & CNM April 26
- Warm Ionized Medium (April 29)
Introducing WIM  |
Glassgold Lecture on WIM
Plasma Frequency, Dispersion
Review of WHAM  |
WIM review  |
History of Radio Astronomy
- Recombination (May 4)
Homework 3: Due May 17
- HII regions (May 6)
Stromgren sphere  |