Hai Fu's Homepage

I am part of an international team who discovered the highly variable magnetised environment of an extremely active fast radio burst in a distant galaxy. I contributed to the analysis of the optical spectra of the host galaxy 1.4 billion lightyears away and the background (possibly lensed) galaxy. I also... [Read More]

In Fall 2021 and Spring 2022, two undergraduate students helped me commission a longslit spectrograph on the 17-in telescope (PlaneWave CDK17) at the Van Allen Observatory (VAO). The LISA Spectrograph is made by Shelyak Instruments. The spectrograph bundle includes the spectrograph optics, a small CCD camera for target acquisition, a... [Read More]

The important role played by collisions and mergers in galaxy evolution has been appreciated since the 1970’s. Previous spectroscopic studies of colliding/merging galaxies, while confirming several basic predictions (e.g., elevated nuclear star formation and/or black hole accretion), generally explored only their brighter inner-most regions in a largely non-uniform manner. This... [Read More]

Using absorption lines in the spectra of two background quasars and deep ALMA observations in CO, our group discovered a cold gas stream in a massive dark matter halo. The stream is made of gas that is extremely poor in heavy elements. The detection signifies that massive starburst galaxies existed... [Read More]

For the first time, we use the CO Tully-Fisher relation and a Bayesian statistical method to show the dramatic evolution in gas content of star-forming galaxies, confirming previous result that galaxies were much more gaseous billions of years ago. [Read More]