Institute of Astronomy

- Julia Sisk-Reynes


Office: Obs O14
Office Tel: (01223) 337531
More Info (Internal)



I am interested in constraining very light Axion-Like Particles (ALPs) using the X-Ray transparency of galaxy clusters. So far, I have been working in constraining very light ALPs using Chandra High Energy Transmission Grating spectroscopy of the powerful cluster-hosted quasar H1821+643. In the long term, I will focus on testing the sensitivity of the Athena X-Ray Observatory, expected to be launched in 2034, to constraining these very light ALPs. 

Selected papers

New constraints on light Axion-Like Particles using Chandra Transmission Grating Spectroscopy of the powerful cluster-hosted quasar H1821+643 - J. Sisk Reynés, James H. Matthews, Christopher S. Reynolds, et al. (2021)



2021 - Part-II undergraduate supervisions 

Astrophysical Fluid Dynamics (2020-21)

2019 - Summer research project in particle physics at the University of Manchester

Supervisor: Dr Darren Price and Dr Andrzej Szelc. Project title: 'Enlarging the energy recoil window for direct dark matter detection at the DarkSide-20k liquid Argon experiment'.

2019 - Teach First Insight Programme - London and Southampton, UK

2018 - Teach Physics Internship awarded by the Ogden Trust - Bury, UK


2020 - present: Ph.D. in Astronomy, Institute of Astronomy, The University of Cambridge

Supervisors: Prof Chris Reynolds and Dr Anastasia Fialkov. Collaborating with Dr James Matthews.

2016 - 2020: MPhys (Hons) Physics, The University of Manchester.

Awards and Prizes

2020 - Stellify Award 

Awarded by the University of Manchester in recognition of contributions and commitment made over the course of my undergraduate studies in the areas of volunteering, leadership and ethical grand challenges.

Page last updated: 16 September 2021 at 09:03