Jackie Champagne

Howdy! I'm Jackie, a third year graduate student at the University of Texas at Austin. I work with Professor Caitlin Casey on submillimeter/radio observations of intensely star-forming and dusty galaxies at high redshift, in particular how they help us learn about the assembly of large-scale structure in the Universe.

Girl with the ALMA Tattoo

I grew up in Jackson, New Jersey. Despite embracing breakfast taco culture in Texas, I will die defending bagels and pizza. I didn't learn how to pump my own gas until I was 23, and I go out of my way to avoid left turns.

I earned my B.S. in physics and astrophysics in 2016 from Rutgers University, where I did research with Prof. Chuck Keeton. In 2014 I was an REU student at Cornell Univeristy working on gravitationally lensed submillimeter galaxies with Prof. Dominik Riechers, and in 2015 I was a research intern under Dr. Fabian Walter using ALMA data to search for continuum sources around z=6 quasars. A budding interest in submillimeter observations and dusty stuff led me to Prof. Caitlin Casey, with whom I now work at UT Austin. You can check out some research details under the research tab.

As I was learning about astronomy as a career option, what fascinated me most was radio interferometry and how it has revolutionized what we know about the long-wavelength Universe. To celebrate that passion, I tattooed a dish on my arm, so feel free to call me by my self-given nickname, Girl with the ALMA Tattoo.

In my spare time I like to crochet, swim, and stay in the air conditioning.

My Research

Broadly, I am interested in the processes by which large-scale structures form and evolve along the cosmic timeline. In particular I use major submillimeter/millimeter/radio-wavelength facilities to trace things like molecular gas, atomic gas, and dust emission in the hopes of studying the physics behind extreme galaxies and how they are shaped by their environments.

My first grad project built on my work with Dr. Fabian Walter at MPIA, in which I used ALMA Band 6 observations of z=6 quasars to search for dust continuum overdensities. Such an overdensity would suggest evidence for early clustering around massive quasars, and these have been found with other tracers such as [CII] and Lyman-alpha. Interestingly, we do not find a corresponding overdensity in dust emission, but it's important to keep in mind that a millimeter continuum search probes Gpc scales: a true overdensity may exist but its signal could be washed out. This result has been submitted to ApJ, and we are working on spectroscopic followup to the sources we did find, in order to strengthen the argument that continuum can be used to search for such overdensities.

Currently I am focusing on observations of protoclusters, and more specifically the properties of the member dusty star-forming galaxies (DSFGs) therein. I'm using JVLA data at 33GHz to trace CO(1-0) and perform a molecular gas census for SCUBA-2-selected galaxies in a galaxy protocluster at z=2.47. Are DSFGs ubiquitous in protoclusters? Do all protoclusters go through starburst periods? Can the molecular gas trigger simultaneous starburst events in structures several comoving Mpc across?

A third side project to which I've contributed is in developing the science case for the next generation Very Large Array, or ngVLA. While the plans to build it are still beyond anyone's knowledge, I've been helping run simulated observations of CO up to J=4-3 in submillimeter galaxies to compare with ALMA's current capabilities. It turns out that a longer wavelength facility that matches some of ALMA's specs would allow us to study molecular gas not only in extreme systems but also regular star forming galaxies. Stay tuned for that!

Bibliography

"No Evidence for Millimeter Continuum Source Overdensities in the Environments of zgt6 Quasars," Champagne et al., submitted June 2018.

Professional Activities

I'm interested in lots besides research! You can find a full CV here, too.

Teaching

Most recently I TAed for AST307 (Sp18), Introduction to Astronomy for Non-Majors. I really enjoy teaching and I got a lot of hands-on experience in this group-based style of class. I helped design and moderate in-class activities and held additional study sessions outside of class, and it was my favorite part of that semester!

Equity & Inclusion in Astronomy

As a woman in STEM and a global citizen in general, I am passionate about tackling institutional biases and unfair treatment in academia. I am a member of UT's Equity and Inclusion discussion group, which has hosted mentorship workshops, helped draft a new department Code of Conduct, and joined up with other campus organizations to host allyship workshops. I'm heavily involved in TAURUS, a nine-week summer research program designed for under-represented undergraduate students; I have helped organize workshops and seminars as well as student peer mentorship.

Astronomy on Tap

Astronomy on Tap is a (now international!) organization hosting astronomy-themed talks at local venues geared toward the public. Austin boasts a widely-attended chapter hosted at the North Door, and I am on the organizing board! I also help run our social media accounts, so you can find some quality jokes on our Twitter, @AoTATX. I also gave a talk on radio interferometry in Fall 2016, available here.

Python for beginners

Developed for the aforementioned TAURUS program, I have designed a series of Jupyter notebooks containing step-by-step tutorials for Python beginners. The tutorial is aimed toward the first-time undergraduate unfamiliar with basic command-line work, but it is easy to jump ahead if you are simply looking for some Python basics. It contains instructions for the obvious things like syntax, array manipulation, plotting, etc, as well as astropy and aplpy demonstrations geared specifically for astronomers. This is all available on my github.

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