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
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.
Publication
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)
Articles
- 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)
- 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)
- 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)
- 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)
Thesis
- Harrison, I. 2013. Cosmology with extreme galaxy clusters. PhD Thesis, Cardiff University.