# Radiative Processes in Astrophysics

An introduction to the basic physics of astronomy and astrophysics at the graduate level. Principles of energy transfer by radiation. Elements of classical and quantum theory of photon emission; bremsstrahlung, synchrotron radiation. Compton scattering, plasma effects, atomic and molecular electromagnetic transitions. With applications to current research into astrophysical phenomena.

These are a collection of lectures covering topics in an introductory graduate astrophysics course on radiative processes. The subject matter is loosely drawn from Radiative Processes in Astrophysics by Rybicki & Lightman.

At the end of the semester, each student will develop one new lecture on a subject of their choice to add to this website.

### Class Code Repository[edit]

http://github.com/AaronParsons/astro207

### Syllabus[edit]

### Useful External References[edit]

- Rybicki and Lightman,
**Radiative Processes in Astrophysics***(course reference)* - Mihalas and Mihalas,
**Foundations of Radiation Hydrodynamics** - Osterbrock and Ferland,
**Astrophysics of Gaseous Nebulae and Active Galactic Nuclei** - Shu, '
**The Physics of Astrophysics, Volume I: Radiation** - Longair,
**High Energy Astrophysics** - Mihalas,
**Stellar Atmospheres** - Rutten,
**Radiative Transfer in Stellar Atmospheres** - Eddie Baron's GRK Lectures on Radiation Transport
- Tony Readhead's Notes
- Feynman's Lectures on Physics, Volume II

## Topics by Date[edit]

#### (Aug. 26) Radiative Quantities (RL 1.1-1.3; Mil 1.1-1.3)[edit]

- class mechanics
- syllabus
- references
- Rybicki & Lightman
- Astrobaki: learn better by teaching

- tools for figuring stuff out
- theoretical derivation
- order-of-magnitude estimation
- physical intuition (hands-on modeling, analogies)
- numerical simulation

- programming
- Python Installation and Basic Programming
- Revision Control (class repository)
- Jupyter Notebooks (for visualizations and collaborating)

- Topics
- Activities

#### (Aug. 31) radiative transport (RL 1.4; Mil 2.1-2.2)[edit]

- Topics
- Activities
- Activity Sheet 2
- Activity Sheet 2 solutions
- sliding pennies

- Problem Set 1 assigned

#### (Sep. 2) Maxwell's Equations and Plane Waves[edit]

- Topics
- Maxwell Equations for Electromagnetic Waves
- Electromagnetic Plane Waves
- Energy Density of Electromagnetic Waves
- Larmor Formula
- Fourier Transform

- Activities
- Activity Sheet 3 (on datahub.berkeley.edu)
- Activity Sheet 3 solutions
- Larmor Demo
- Impedance of free space

#### (Sep. 7) scattering and absorption (RL 1.4, 1.7; Mil 2.1-2.2)[edit]

- Topics:
- Activities
- Activity Sheet 4 (on datahub.berkeley.edu)
- photon diffusion
- high beams in fog

- Problem Set 2 Assigned

#### (Sep. 9) thermodynamic equilibrium (RL 1.5)[edit]

- Topics
- Activities
- Activity Sheet 5 (on datahub.berkeley.edu)
- flipping pennies, rolling dice
- types of temperature

#### (Sep. 14) semi-classical hydrogen[edit]

- Topics:
- Activities
- Activity Sheet 6 (on datahub.berkeley.edu)
- rederivation
- Rydberg
- dipoles/quadrupoles

- Problem Set 3 Assigned

#### (Sep. 16) Einstein coefficients[edit]

- Topics:
- Activities
- Activity Sheet 7 (on datahub.berkeley.edu)
- estimating Einstein A for Ly-alpha
- effective photon absorption crosssection

#### (Sep. 21) spectral line broadening[edit]

- Topics
- Activities
- Activity Sheet 8 (on datahub.berkeley.edu)
- what can you learn from a spectral line

- Problem Set 4 Assigned

#### (Sep. 23) radiation from accelerating charges (RL 3.3-3.4)[edit]

- Topics
- Estimating Atomic Transition Strengths
- radiative dipole transitions
- photoexcitation cross-section

- Activities
- Activity Sheet 9 (on datahub.berkeley.edu)
- Einstein A for He+

#### (Sep. 28) molecular lines (RL 11)[edit]

- Topics
- Activities
- CO Lecture

- No Problem Set this week

#### (Sep. 30) rovibrational transitions (RL 11)[edit]

- Topics
- Activities
- Activity Sheet 11 (on datahub.berkeley.edu)
- Cooling with CO

#### (Oct. 5) masers[edit]

- Topics
- Activities
- masers as transistors
- laser pointers

- Problem Set 5 assigned

#### (Oct. 7) collisional excitations[edit]

- Topics:
- Activities
- Activity Sheet 12 (on datahub.berkeley.edu)
- more CO molecular clouds
- collisional line-driven cooling

#### (Oct. 12) free-free emission[edit]

- Topics
- Thermal Bremsstrahlung (RL 5.1-5.3)
- Opacity
- Kramer's Opacity

- Activities
- free-free polarization
- simulating a free-free interaction

- Problem Set 6 assigned

#### (Oct. 14) charged cross-sections (RL 1.7-1.8; Mil 2.3-2.5)[edit]

- Topics:
- Activities
- Activity Sheet 13 (on datahub.berkeley.edu)
- electrons in the IGM

#### (Oct. 19) bound-free transitions[edit]

- Topics
- Activities
- stromgren spheres

- Problem Set 7 assigned

#### (Oct. 21) LTE and non-LTE[edit]

- Topics
- Activities
- Activity Sheet 14 (on datahub.berkeley.edu)
- estimating recombination coefficients
- work out in detail redshift of recombination

#### (Oct. 26) plasma effects[edit]

- Topics
- Plasma Frequency
- dispersion measure (RL 8.1)
- polarization
- Faraday rotation (RL 8.1-8.2)
- Stokes parameters

- Activities
- start de-dispersion coding

- Problem Set 8 assigned

#### (Oct. 28) compton scattering[edit]

- Topics
- Lorentz transformations
- Doppler shift
- radiation from relativistic charges (RL 4.1, 4.2, 4.8; Grif 10.1)
- Compton Scattering

- Activities
- Activity Sheet 15 (on datahub.berkeley.edu)
- relativistic intuition, velocity raptor
- CMB coupling via compton

#### (Nov. 2) Inverse Compton scattering[edit]

- Topics:
- Inverse Compton Scattering
- SZ Effect (RL 7.1-7.5)

- Activities
- single scattering versus ensemble scattering
- compton saturation

- No problem set

#### (Nov. 4) Synchrotron Introduction[edit]

- Topics:
- Activities
- Activity Sheet 16 (on datahub.berkeley.edu)
- beaming, superluminal motion, monte carlo compton

#### (Nov. 9) Synchrotron Radiation[edit]

- Topics
- Activities
- re-deriving synchrotron spectrum
- phenomenological description of synchrotron decay

- Problem Set 9 assigned

#### (Nov. 11) No Class (Veterans day)[edit]

#### (Nov. 16) Synchrotron Self-Interactions[edit]

- Topics
- Activities
- Activity Sheet 17 (on datahub.berkeley.edu)
- reading SSC spectra, inferring castrophe

#### (Nov. 18) dust and grains[edit]

- Topics:
- Dust Absorption and Scattering
- dust formation/sublimation
- Poynting-Robertson Effect

- Activities
- Problem Set 10 assigned

#### (Nov. 23) No Class[edit]

#### (Nov. 25) No Class[edit]

#### (Dec. 1) radiative diffusion[edit]

- Topics:
- Radiative Diffusion
- bolometric radiative equilibrium
- greenhouse effect

- Activities

#### (Dec. 2) Review[edit]

- Review

## Misc Topics[edit]

## Legacy Lecture Notes[edit]

- Radiation Lecture 01
- Radiation Lecture 02
- Radiation Lecture 03
- Radiation Lecture 04
- Radiation Lecture 05
- Radiation Lecture 06
- Radiation Lecture 07
- Radiation Lecture 08
- Radiation Lecture 09
- Radiation Lecture 10
- Radiation Lecture 11
- Radiation Lecture 12
- Radiation Lecture 13
- Radiation Lecture 14
- Radiation Lecture 15
- Radiation Lecture 16
- Radiation Lecture 17
- Radiation Lecture 18
- Radiation Lecture 19
- Radiation Lecture 20
- Radiation Lecture 21
- Radiation Lecture 22
- Radiation Lecture 23
- Radiation Lecture 24
- Radiation Lecture 25
- Radiation Lecture 26