Science Highlights

NEW: Davies et al. (2026, MNRAS, 549, stag874): Using JWST and ALMA, we imaged the multiphase outflow from CRISTAL-02, a massive star-forming galaxy at z~5.3 (1 billion years after the Big Bang). The outflow is removing gas at 2x the star-formation rate, and the outflow velocity is comparable to the galaxy escape velocity. If the outflow continues at this rate, it could eject all the cold gas from the galaxy in less than 100 Myr, leaving a massive quiescent galaxy by z~4.

Read more in this article I wrote for The Conversation.

I research the baryon cycle and galactic outflows across the majority of the history of the Universe, from redshift z~0 (now) to z~6 (less than 1 billion years after the Big Bang), using spectroscopic data spanning rest-frame UV to submillimeter wavelengths.

I am currently an active member of two international collaborations:

• Blue Jay: A JWST survey providing long-slit optical-to-near-infrared spectral of approximately 150 main sequence galaxies at z~2, providing the first comprehensive view of the absorption line properties of galaxies at this epoch. We found the first evidence for widespread, powerful AGN-driven neutral gas outflows which may be a dominant driver of early fast quenching (read more).
• ASKAP-FLASH: A blind search for HI 21cm absorption at 0.4 < z < 1.0 using the Australian SKA Pathfinder. I am co-leading efforts to obtain optical spectroscopy of the HI host galaxies, providing valuable insights into a wide range of topics including AGN fuelling and feedback, the CGM and star-formation, and galaxy quenching.

Click the links below to find out more about my past and current research projects: