Hi! I'm Daisy Leung, a graduate student in Astronomy at Cornell University and the Flatiron Institute.

I work on the star-forming gas properties of galaxies
in the distant Universe.

ADS Publications Why Astrophysics? email

Astrophysics Research

My reseach seeks to address: How did the first stars, galaxies, and supermassive black holes form since the beginning of the Universe? How do they evolve and why? How do they connect to what we see today? My work is done mainly in collaboration with Prof. Andrew Baker, Prof. Caitlin Casey, Dr. Chris Hayward, Prof. Rachel Somerville, Prof. Andrea Ferrara, Dr. Andrea Pallottini, Prof. Mordecai M. Mac Low, and Prof. Romeel Dave.

SMBH-Host co-evolution

In my ALMA program, we study the molecular gas kinematics of high-redshift quasars and their BH-to-host mass ratios to examine the co-evolution between supermassive black holes and their host galaxies since early epochs.

Galaxy Simulations

I work on comsmological zoom-in simulations (Serra and Simba) to make predictions for guiding future observations in designing surveys that will allow us to better understand the physics behind the formation of the first galaxies.

High-redshift Galaxy Kinematics

I use mutliwavelength photometry and spectral line observations to examine the star-forming properties and molecular gas kinematics (using CO and [CII] lines) of early galaxies to gain insights into their formation mechanisms.

Statistical Methods

Using diffuse nested sampling, we developed a tool (StarStudded) to produce probabilistic catalogs from noisy images of a crowded field of stars.

Gravitational Lensing

Lensing magnifies the size and brightness of a background source, allowing us to study distant galaxies in more detail. I have worked on a lens modeling code UVMCMCFIT to reconstruct the intrinsc properties of the background galaxy.

21-cm Experiement

I worked on the frontend developement and the construction for the HERA prototype before going to graduate school. HERA is designed to detect the HI 21cm line at the Epoch of Reionization.

Useful links for research. For teaching and outreach, more information can be found here.


I certainly don't consider myself an expert on computers or coding. This page contains some of the issues that I have encountered in the past in doing my research and describes the solution to overcome them. I have learned a lot over the years, thanks to the generousity of many in sharing their knowledge. I would like to pay it forward by sharing.

Since April 2015, I have also been posting on my computing blog, which is based off Wordpress. Some of my old notes on fixing installation issues I have had with software packages, such as CASA, MIRIAD, GILDAS, and Homebrew can be found here, where I also describe some tools I use on a daily basis for my research.

I have a strong to desire to learn. I often use my own time outside of research to learn new skills. A while ago, I made a website using Ruby/Jekyll. I plan on updating side projects here in the future.


I am a huge fan of photography. I focus mainly on landscape, seascape, and night photography. I am also beginning to do more wildlife photography.


Check out my flickr to see more photos.

About Me

I was born and raised in Hong Kong for 17 years. I moved to California to puruse my Bachelor's Degree in Astronomy at UC Berkeley in 2009. I have since moved to Ithaca, NY for my PhD degree at Cornell. I have recently relocated to Manhattan to continue my thesis work at the Flatiron Institute. I am the youngest in my family, excluding the two cats I grew up with and the cat, Mao Mao that I live with in the States.

I love reading, swimming, cleaning, traveling, hiking, backpacking, rock climbing, and playing badminton. Occasionally, I go on photography trips with my friends whenever I get time off.

People often ask about how do I pronounce my first name "Tsz Kuk", the quick answer to that is: I am not sure, but I go by Daisy for English speakers. I believe it is solely a way of romanization or transliteration used in Hong Kong based on the pronounciation of the word in Cantonese (adopted by the Government of Hong Kong).