Mr Ian Harrison

Research Associate
Astronomy Instrumentation Group
Cardiff Hub for Astrophysics Research and Technology

School of Physics and Astronomy

: HarrisonI@cardiff.ac.uk
: Queen's Buildings - North Building, Room N/3.20A, 5 The Parade, Newport Road, Cardiff, CF24 3AA

Overview
Publications

I am currently a Research Associate in the School of Physics and Astronomy at Cardiff University. I now have a few different research interests in observational and statistical cosmology, but my primary area of work is in developing cross-correlation methods between the Cosmic Microwave Background and other observables for the Simons Observatory.

I have worked on weak gravitational lensing, both in the radio with the SuperCLASS survey and the future SKAO Telescope, and in the optical with the Dark Energy Survey (DES). I am also interested in novel ways of combining radio and gravitational wave data to do cosmology, and in cosmology with galaxy cluster number counts. I am a founding member of the SkyPy Collaboration, which aims to create forward models for coherent simulation of astronomical observables across all wavebands(!).

Previously I was a Research Associate at the University of Manchester from 2013 - 2021, and I remain a visitor there. I was also a long-term visitor at the University of Oxford from 2018 - 2021.

Before this I obtained a MSci from Imperial College London in Physics with Theoretical Physics in 2010 and a PhD in Astrophysics from Cardiff University in 2013. During my PhD I worked under the supervision of Prof Peter Coles on cosmology with extreme value statistics.

Date
Type

2023

Prat, J. et al. 2023. Non-local contribution from small scales in galaxy-galaxy lensing: Comparison of mitigation schemes. Monthly Notices of the Royal Astronomical Society 522(1), pp. 412-425. (10.1093/mnras/stad847)
Omori, Y. et al. 2023. Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and Planck . I. Construction of CMB lensing maps and modeling choices. Physical Review D 107, article number: 23529. (10.1103/PhysRevD.107.023529)
Chang, C. et al. 2023. Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and Planck . II. Cross-correlation measurements and cosmological constraints. Physical Review D 107(2), article number: 23530. (10.1103/PhysRevD.107.023530)
Abbott, T. et al. 2023. Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and Planck . III. Combined cosmological constraints. Physical Review D 107, article number: 23531. (10.1103/PhysRevD.107.023531)
Lovell, C. C., Harrison, I., Harikane, Y., Tacchella, S. and Wilkins, S. M. 2023. Extreme value statistics of the halo and stellar mass distributions at high redshift: are JWST results in tension with ΛCDM?. Monthly Notices of the Royal Astronomical Society 518(2), pp. 2511–2520. (10.1093/mnras/stac3224)

2022

Doux, C. et al. 2022. Dark energy survey year 3 results: cosmological constraints from the analysis of cosmic shear in harmonic space. Monthly Notices of the Royal Astronomical Society 515(2), pp. 1942-1972. (10.1093/mnras/stac1826)
Secco, L. F. et al. 2022. Dark Energy Survey year 3 results: three-point shear correlations and mass aperture moments. Physical Review D 105(10), article number: 103537. (10.1103/PhysRevD.105.103537)

2013

Harrison, I. 2013. Cosmology with extreme galaxy clusters. PhD Thesis, Cardiff University.

2012

Harrison, I. and Coles, P. 2012. Testing cosmology with extreme galaxy clusters. Monthly Notices of the Royal Astronomical Society: Letters 421(1), pp. L19-L23. (10.1111/j.1745-3933.2011.01198.x)

2011

Harrison, I. and Coles, P. 2011. Exact extreme value statistics and the halo mass function. Monthly Notices of the Royal Astronomical Society: Letters 418(1), pp. L20-L24. (10.1111/j.1745-3933.2011.01134.x)

External profiles

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