Department of Astronomy and Astrophysics

ASTR 30100. Stars. 100 Units.

Introduction to stars (physical and observational), hydrodynamics of self-gravitating fluids, statistical mechanics and equations of state, energy transport, astrophysical nuclear reactions, stellar models, advanced topics.

Instructor(s): Harley Katz     Terms Offered: Autumn
Prerequisite(s): Open to 4th year undergraduates by consent of instructor.

ASTR 30400. Galaxies. 100 Units.

The observed universe, the universe at high redshift, early universe microwave background radiation, relativistic homogeneous isotropic cosmologies, evolution of structure in the universe, primordial nucleosynthesis.

Instructor(s): Hsiao-Wen Chen     Terms Offered: Spring
Prerequisite(s): Open to 4th year undergraduates by consent of instructor.

ASTR 30600. Detection of Radiation. 100 Units.

Radiation as a random process, optical coherence, and signal analysis in spatial and temporal domains, along with the detection and measurement of radiation with astronomical instruments.

Instructor(s): Clarence Chang     Terms Offered: Spring
Prerequisite(s): Open to 4th year undergraduates by consent of instructor.

ASTR 31000. Cosmology I. 100 Units.

This course presents an introduction to the principles of cosmology. The first part introduces homogeneous, relativistic cosmologies and covers the Robertson-Walker metric, dynamics in the presence of matter, radiation, and dark energy, the universe as a function of time and redshifts, and techniques for calculating observable quantities. The next part covers the growth and evolution of structure in the universe including the formation of clusters and voids, correlation functions, and the mass spectrum. The next part covers the physics of the early universe, including inflation, primordial nucleosynthesis, and recombination. The final part covers current topics in cosmology, including analysis of the cosmic microwave background and tests for detecting and measuring dark matter and dark energy.

Instructor(s): Dan Hooper     Terms Offered: Winter
Prerequisite(s): Open to 4th year undergraduates by consent of instructor.

ASTR 31100. High Energy Astrophysics. 100 Units.

This course covers a wide range of phenomena associated with the astrophysics of high energy photons, cosmic rays and neutrinos, including the processes of ionization, bremsstrahlung, synchrotron, pion production, Compton and inverse Compton scattering, as well as cosmic ray acceleration. Specific sources of high energy emission will also be discussed, including active galaxies, pulsars, gamma-ray bursts and supernova remnants.

Instructor(s): Damiano Caprioli     Terms Offered: Winter
Prerequisite(s): Open to 4th year undergraduates by consent of instructor.

ASTR 31200. Computational Techniques in Astrophysics. 100 Units.

This course will introduce basic computational techniques most often used in astronomical research, such as interpolation, transforms, smoothing, numerical differentiation and integration, integration of ordinary differential equations, and Monte Carlo methods, and elements of basic computer algorithms, data structures, and parallel programming using Python as the main course programming language with heavy use of NumPy, SciPy, and Matplotlib packages. Practical examples where these numerical techniques are applied will be covered via homework and in class exercises using real-world astronomical problems and results of recent papers with emphasis on implementing the algorithms from scratch. The course will cover the access to astronomical archival data, and how to search it efficiently, focusing specifically on the Sloan Digital Sky Survey, but with introduction to other data sets. Machine learning methods will be introduced to illustrate how large data sets can be mined for interesting information.

Instructor(s): Andrey Kravtsov     Terms Offered: Winter
Prerequisite(s): ASTR 20500 or CMSC 14100 or consent of instructor.
Equivalent Course(s): ASTR 21100

ASTR 31400. Creative Machines and Innovative Instrumentation. 100 Units.

An understanding of the techniques, tricks, and traps of building creative machines and innovative instrumentation is essential for a range of fields from the physical sciences to the arts. In this hands-on, practical course, you will design and build functional devices as a means to learn the systematic processes of engineering and fundamentals of design and construction. The kinds of things you will learn may include mechanical design and machining, computer-aided design, rapid prototyping, circuitry, electrical measurement methods, and other techniques for resolving real-world design problems. In collaboration with others, you will complete a mini-project and a final project, which will involve the design and fabrication of a functional scientific instrument. The course will be taught at an introductory level; no previous experience is expected. The iterative nature of the design process will require an appreciable amount of time outside of class for completing projects. The course is open to undergraduates in all majors (subject to the pre-requisites), as well as Master's and Ph.D. students.

Instructor(s): Scott Wakely (Autumn), John Carlstrom (Winter), Stephan Meyer (Spring)     Terms Offered: Autumn Spring Winter
Prerequisite(s): PHYS 12200 or PHYS 13200 or PHYS 14200; or CMSC 12100 or CMSC 12200 or CMSC 12300; or consent of instructor.
Equivalent Course(s): PSMS 31400, CMSC 21400, CHEM 21400, PHYS 21400, ASTR 21400

ASTR 32060. What Makes a Planet Habitable? 100 Units.

This course explores the factors that determine how habitable planets form and evolve. We will discuss a range of topics, from the formation of planets around stars and the delivery of water, to the formation of atmospheres, climate dynamics, and the conditions that allow for the development of life and the evolution of complex life. Students will be responsible for periodically preparing presentations based on papers in peer-reviewed journals and leading the discussion.

Instructor(s): E. Kite     Terms Offered: Winter
Equivalent Course(s): ASTR 22060, GEOS 22060, GEOS 32060

ASTR 32100. Cosmology II. 100 Units.

Study of physical cosmology with emphasis on the standard big-bang model and its observational and experimental tests.

Instructor(s): Wayne Hu     Terms Offered: Autumn

ASTR 33100. Astrophysical Fluid Dynamics. 100 Units.

This course will cover selected topics of fluid dynamics that are most relevant to astrophysics. We will intuitively derive the Euler equations that describe inviscid fluids and apply them to classical problems of sound and gravity waves, instabilities, and shocks. We will start with a basic understanding of these problems and gradually increase the level of complexity to bring them to more realistic environments of the interstellar, circumgalactic, and intergalactic media. We will finish the course by discussing the motion of viscous fluids and examples from computational fluid dynamics. Selected astrophysical examples will be discussed throughout the course. This course is tailored for graduate students and senior undergraduates in physics and astrophysics. No previous exposure to fluid dynamics is required.

Instructor(s): Irina Zhuravleva     Terms Offered: Autumn

ASTR 34000. Statistical Methods in Astrophysics. 100 Units.

An exploration of the variety of statistical methods used in modern astrophysics. We discuss the frequentist (hypothesis tests, confidence intervals) and Bayesian (explicit priors, model-choosing, parameter estimation) approaches. Other topics include: Markov Chain Monte Carlo and other computational statistics; multi-dimensional likelihood space; Fischer information matrices; time series analysis. Assignments draw from examples in the astronomical literature.

Instructor(s): Chihway Chang     Terms Offered: Winter

ASTR 35000. Order-of-Magnitude Astrophysics. 100 Units.

In physics and astrophysics, an approximate answer is often just as (if not more) useful than an exact answer. Making order-of-magnitude estimates is helpful to develop physical intuition, to verify numerical solutions, and to evaluate whether a research problem is worth pursuing. In this course, students will receive coaching and practice in physics-based reasoning, back-of-the envelope estimation, and thinking on their feet. Students will be encouraged to take a broad perspective, to think critically, and to have fun using physics to understand the universe around them.

Instructor(s): Leslie Rogers     Terms Offered: Autumn
Equivalent Course(s): ASTR 25000

ASTR 37100. Precandidacy Research. 300.00 Units.

Students arrange with a faculty research supervisor to conduct a short-term independent research project lasting one or more quarters. Research completed in ASTR 37100 is presented as part of the student's candidacy exams.

Instructor(s): Various     Terms Offered: Autumn Spring Summer Winter

ASTR 39000. Counterhistories of Mathematics and Astronomy. 100 Units.

Mathematics and astronomy are often taught as packaged universal truths, independent of time and context. Their history is assumed to be one of revelations and discoveries, beginning with the Greeks and reaching final maturity in modern Europe. This narrative has been roundly critiqued for decades, but the work of rewriting these histories has only just begun. This course is designed to familiarize students with a growing literature on the history of mathematics and astronomy in regions which now make up the global south. It is structured as a loosely chronological patchwork of counterexamples to colonial histories of mathematics and astronomy. Thematic questions include: How were mathematical and astronomical knowledge conjoined? How were they embedded in political contexts, cultural practices, and forms of labor? How did European scientific modernity compose itself out of the knowledges of others? Where necessary, we will engage with older historiographies of mathematics and astronomy, but for the most part we will move beyond them. No mathematics more advanced than highschool geometry and algebra will be assumed. However, those with more mathematical preparation may find the course especially useful.

Instructor(s): Prashant Kumar     Terms Offered: Spring
Equivalent Course(s): HIPS 27010, ASTR 29000, CHSS 39001, SALC 39000, HIST 35305, KNOW 39000

ASTR 39900. Reading And Research: Astronomy. 300.00 Units.

Readings and Research for working toward their PhD.

Terms Offered: Autumn Spring Summer Winter

ASTR 44700. The Hubble Constant. 100 Units.

The Hubble constant is the cosmological parameter that sets the absolute scale, size and age of the universe; it is one of the most direct ways we have of quantifying and constraining how the universe evolves. In recent years, a tension has arisen in measurements of the Hubble constant that come from using Cepheid variables to tie into the Hubble expansion based on Type Ia supernovae (~74 km/sec/Mpc), and those inferred from measurements of fluctuations in the cosmic microwave background (~67 km/sec/Mpc). Yet a third method, using red giant branch stars (the Tip of the Red Giant Branch or TRGB) give results that lie between the Cepheids and CMB (~70 km/sec.Mpc). This discrepancy raises the interesting possibility that there is physics missing from our standard (Lambda) Cold Dark Matter cosmological model. In this course we will cover the history of recent measurements of the Hubble constant, delve into how current measurements are made, examine the theoretical ideas for explaining the current tension, and look forward to the future and prospects for either supporting or refuting the case for new physics.

Instructor(s): Wendy Freedman     Terms Offered: Spring

ASTR 49400. Post-Candidacy Research. 300.00 Units.

Independent research undertaken towards completion of the dissertation.

Instructor(s): Various     Terms Offered: Autumn Spring Summer Winter
Prerequisite(s): Completion of all candidacy requirements.

ASTR 49910. Graduate Seminar: Colloquium. 100 Units.

In this course for first-year Ph.D. students in Astronomy and Astrophysics, students will become acquainted with the research of the weekly colloquium speakers and prepare for active participation in the colloquia.

Instructor(s): Hsiao-Wen Chen     Terms Offered: Winter

ASTR 49920. Graduate Seminar: Fellowship and Proposal Writing. 100 Units.

In this course for first-year Ph.D. students in Astronomy and Astrophysics, students will identify prospective fellowship or research funding opportunities and learn how to prepare strong applications, with the goal of producing completed examples as final projects.

Instructor(s): Austin Joyce     Terms Offered: Spring

ASTR 49930. Graduate Seminar: Candidacy Preparation. 100 Units.

In this course for second-year Ph.D. students in Astronomy and Astrophysics, students will prepare for part two of the candidacy examination through presentations, board work, discussion, and questions.

Instructor(s): Wayne Hu     Terms Offered: Spring