Welcome to the website for Physics 224. Here you can find links to the syllabus, assignments, lecture notes, and other useful material.

• Syllabus - updates 4/16/18
• Link for paper discussion sign up
• Rubric for Grading Paper Presentations
• Homework 1 - due 4/20
• Homework 2 - due 5/3
• Halpha image of the Orion Nebula from MUSE - pixels are 0.2" in size.
• A representative spectrum of the Orion Nebula from MUSE. Units are wavelength in Angstroms (column 1) and relative flux (column 2).
• ds9 - a tool for manipulating fits imates.
• python fits tutorial - if you prefer python
• Homework 3 - due 5/25

• 4/4/18: On Friday 4/6 we will have a special presentation by Prof. Jeffrey Linsky on "Probing the Local ISM with UV Spectroscopy: Properties, Structure, and Possible Causes"
• 4/19/18: Here's a link to the discussion questions everyone submitted for our first paper discussion: Dicussion Questions
• 4/26/18: Discussion questions Sellgren 1984 and Weingartner and Draine 2001: Dicussion Questions
• 5/3/18: Discussion questions FGH 1969 and Wolfire et al. 1995: Dicussion Questions
• 5/10/18: Discussion questions for Goodman et al. 2009 and Larson 1981: Discussion Questions
• 5/18/18: Discussion questions for McKee and Ostriker 1977 and Ostriker, McKee and Leroy 2010: Discussion Questions

• 4/20 - Stromgren 1939 - Kielan Wilcomb and all - Discussion Questions
• 4/20 - Werk et al. 2014 - Max Silva-Feaver - Discussion Questions
• 4/27 - Weingartner & Draine 2001 - Azton Wells - Discussion Questions
• 4/27 - Sellgren 1984 - Karin Sandstrom and class - Discussion Questions
• 5/4 - Field, Goldsmith & Habing 1969 - Kielan Wilcomb - Discussion Questions
• 5/4 - Wolfire et al. 1995 - Stella Zhang - Discussion Questions
• 5/11 - Larson 1981 - Jen Ito - Discussion Questions
• 5/11 - Goodman, Pineda & Schnee 2009 - Dino Chih-Chun Hsu - Discussion Questions
• 5/18 - McKee & Ostriker 1977 - Caleb Choban - Discussion Questions
• 5/18 - Ostriker, McKee & Leroy 2010 - Erin George - Discussion Questions

• Observational Proposals
• Hubble Cycle 25 Call for Proposals - includes theory/archive
• ALMA Cycle 6 Call for Proposals
• Supercomputing Proposals
• XSEDE Research Allocations

• Lecture 1 Slides - Overview of class and ISM historical perspective
• Lecture 2 Slides/Notes - More ISM overview and start of collisional processes
• Lecture 3 Notes, Stella's Notes - More collisions, detailed balance, two-level atom
• Lecture 4 Slides - Energy levels, transitions, quantum mechanics review
• Lecture 5 Slides, Stella's Notes - Order of magnitude energy levels, Proposals and Scientific Presentations
• Lecture 6 Slides - Radiative Transfer, HI 21-cm
• Lecture 7 Slides - Absorption Lines, Ionization and Recombination
• Lecture 8 Slides - HII Regions
• Lecture 9 Slides - finishing HII regions, then dust!!!
• Lecture 10 Slides - Dust optical properties, thermal balance
• Lecture 11 Slides - Dust thermal balance, emission, photoelectric effect, dust composition
• Lecture 12 Slides - ISM phases, neutral gas, 2-phase equilibrium
• Lecture 13 Slides - Neutral gas, testing the 2 phase model, HI to H2 transition
• Lecture 14 Slides - Molecular gas, chemistry
• Lecture 15 Slides - Chemistry, tracing molecular gas
• Lecture 16 Slides Observations of molecular gas
• Lecture 17 Slides More observations of molecular gas
• Lecture 18 Slides - ethics and research

• Curve of Growth Widget from Yuan-Sen Ting. Very useful for understanding how the Voigt line profile leads to the "curve of growth" for absorption lines.
• Notes on Star Formation - online textbook by M. Krumholz