**W2L1**: Covered pages 3-9.**W2L2**: Prob 1.3, Prob 1.5. HUDF, First image of BH, Story of Gamma Ray Burst discovery. Appendix B.**W2L3**: Appendix B continued. Intensity and specific intensity (1.3). Problem 1.9, ex 1.2. resolved vs unresolved images (fig 1.8 and 1.9). RA and dec recap.**W3L1**: Olbers' paradox (p.15, Fig 1.11), energy density (sect 1.4), mean intensity J, radiation pressure (sect 1.5)**W3L2:**First part of chapter 2:**PDF****W3L3:**Almost all of the rest of chapter 2. NEW: now with handwritten notes added!**PDF****W4L1:**TA tutorial 1, observing with iTelescope network.**PDF of Ananthan's presentation**. Visualization, example 2.3.**PDF**.**W4L2**: More on the project (not in notes, but here on website), example 2.3 finished, start of chapter 3.**PDF****W4L3**: ch. 3.4.0-3.42, ideal gas law etc.**PDF****W5L1**: blackboard. We covered Mean free path (section 3.4.3), example 3.4, statistical equilibrium, thermodynamic equilibrium (TE) and local thermodynamic equilibrium (LTE) (section 3.4.4.**W5L2**: Ex 3.5, Boltzmann's equation, the neutral hydrogen atom and hydrogen excitation levels.**PDF****W5L3**:**PDF****W6L1:**4.1.1-4.1.5, beginning 4.2.**PDF****W6L2**: 4.2, beginning ch. 5.**PDF****W6L3**:ch 5 cont'd.**PDF****W7L1**: Finishing cross sections, Lyman alpha forest, absorption (ch 5), Strömgren sphere and radius.**PDF****W7L2**: Opacity - optical depth.**PDF****W8L1**: Eddington limit, end of ch 5, Beginning chapter 6, Equation of radiative transfer and its solutions.**PDF****W8L2**: Rest of ch 6: "Most important equation", LTE solution to radiative transfer equation. Absorption and emission and temperatures of background source. HI clouds. Temp limits.**PDF****W9L1**: Chapter 7, redshifts.**PDF****W9L2**: End of chapter 7.**PDF****W9L3**: Chapter 8 - emission processes, thermal and non-thermal emission, Bremsstrahlung.**PDF****W10L1**: Bremsstrahlung in detail, observing it in radio (and x-ray, but that will be in next lecture).**PDF****W10L2**: More Bremsstrahlung, now in X-ray. chimneys.**PDF****W10L3**: Thermal continuum continued: Free-bound (recombination) and bound-bound (2-photon). Non-thermal emission: Cyclotron and Synchrotron.**PDF****W11L1**: Synchrotron emission, magnetic field strengths, magnetospheres, equations, started spectrum derivation.**PDF****W11L2**: Observation project part B, tutorial.**Theresa's (overview, template fitting)**.**Ananthan's (coordinates, conversions, software, analysis)**.**W11L3**: Synchrotron emission, emission and absorption coefficients with pacholczyk's constants, spectral index, synchrotron spectrum.**PDF****W12L1**: Inverse Compton radiation (last of the non-thermal radiation processes). Beginning ch 9: emission lines.**PDF****W12L2**: Emission lines, electric, rotational, vibrational and nuclear transitions.**PDF****W12L3**: Emission lines, line broadening effects: natural, doppler (incl thermal) and pressure broadening.**PDF****W13L1**: HI line, mass measurement. Recombination lines, optical, (radio in W13L2).**PDF****W13L2**: optical (continued - line ratios) and radio recombination lines. Press release.**PDF****W13L3**: Last lecture! Some problems from chapter 10, bringing it all together!**PDF**