Dr Andrew Robertson's Outputs (10)

Halo concentration strengthens dark matter constraints in galaxy-galaxy strong lensing analyses (2021)
Journal Article
Amorisco, N. C., Nightingale, J., He, Q., Amvrosiadis, A., Cao, X., Cole, S., Etherington, A., Frenk, C. S., Li, R., Massey, R., & Robertson, A. (2022). Halo concentration strengthens dark matter constraints in galaxy-galaxy strong lensing analyses. Monthly Notices of the Royal Astronomical Society, 510, 2464-2479. https://doi.org/10.1093/mnras/stab3527

A defining prediction of the cold dark matter cosmological model is the existence of a very large population of low-mass haloes. This population is absent in models in which the dark matter particle is warm (WDM). These alternatives can, in principle... Read More about Halo concentration strengthens dark matter constraints in galaxy-galaxy strong lensing analyses.

Unequal-mass mergers of dark matter haloes with rare and frequent self-interactions (2021)
Journal Article
Fischer, M. S., Brüggen, M., Schmidt-Hoberg, K., Dolag, K., Ragagnin, A., & Robertson, A. (2022). Unequal-mass mergers of dark matter haloes with rare and frequent self-interactions. Monthly Notices of the Royal Astronomical Society, 510(3), 4080-4099. https://doi.org/10.1093/mnras/stab3544

Dark matter (DM) self-interactions have been proposed to solve problems on small length scales within the standard cold DM cosmology. Here, we investigate the effects of DM self-interactions in merging systems of galaxies and galaxy clusters with equ... Read More about Unequal-mass mergers of dark matter haloes with rare and frequent self-interactions.

Testing extensions to ΛCDM on small scales with forthcoming cosmic shear surveys (2021)
Journal Article
Stafford, S. G., McCarthy, I. G., Kwan, J., Brown, S. T., Font, A. S., & Robertson, A. (2021). Testing extensions to ΛCDM on small scales with forthcoming cosmic shear surveys. Monthly Notices of the Royal Astronomical Society, 508(2), 2537-2555. https://doi.org/10.1093/mnras/stab2787

We investigate the constraining power of forthcoming Stage-IV weak lensing surveys (Euclid, LSST, and NGRST) for extensions to the Lambda cold dark matter model on small scales, via their impact on the cosmic shear power spectrum. We use high-resolut... Read More about Testing extensions to ΛCDM on small scales with forthcoming cosmic shear surveys.

The impact of self-interacting dark matter on the intrinsic alignments of galaxies (2021)
Journal Article
Harvey, D., Chisari, N. E., Robertson, A., & McCarthy, I. G. (2021). The impact of self-interacting dark matter on the intrinsic alignments of galaxies. Monthly Notices of the Royal Astronomical Society, 506(1), 441-451. https://doi.org/10.1093/mnras/stab1741

The formation and evolution of galaxies is known to be sensitive to tidal processes leading to intrinsic correlations between their shapes and orientations. Such correlations can be measured to high significance today, suggesting that cosmological in... Read More about The impact of self-interacting dark matter on the intrinsic alignments of galaxies.

N-body simulations of dark matter with frequent self-interactions (2021)
Journal Article
Fischer, M. S., Brüggen, M., Schmidt-Hoberg, K., Dolag, K., Kahlhoefer, F., Ragagnin, A., & Robertson, A. (2021). N-body simulations of dark matter with frequent self-interactions. Monthly Notices of the Royal Astronomical Society, 505(1), 851-868. https://doi.org/10.1093/mnras/stab1198

Self-interacting dark matter (SIDM) models have the potential to solve the small-scale problems that arise in the cold dark matter paradigm. Simulations are a powerful tool for studying SIDM in the context of astrophysics, but it is numerically chall... Read More about N-body simulations of dark matter with frequent self-interactions.

The galaxy–galaxy strong lensing cross-sections of simulated ΛCDM galaxy clusters (2021)
Journal Article
Robertson, A. (2021). The galaxy–galaxy strong lensing cross-sections of simulated ΛCDM galaxy clusters. Monthly Notices of the Royal Astronomical Society: Letters, 504(1), L7-L11. https://doi.org/10.1093/mnrasl/slab028

We investigate a recent claim that observed galaxy clusters produce an order of magnitude more galaxy–galaxy strong lensing (GGSL) than simulated clusters in a Λ cold dark matter (CDM) cosmology. We take galaxy clusters from the C-EAGLE hydrodynamica... Read More about The galaxy–galaxy strong lensing cross-sections of simulated ΛCDM galaxy clusters.

PyAutoLens: Open-Source Strong Gravitational Lensing (2021)
Journal Article
Nightingale, J., Hayes, R., Kelly, A., Amvrosiadis, A., Etherington, A., He, Q., Li, N., Cao, X., Frawley, J., Cole, S., Enia, A., Frenk, C., Harvey, D., Li, R., Massey, R., Negrello, M., & Robertson, A. (2021). PyAutoLens: Open-Source Strong Gravitational Lensing. The Journal of Open Source Software, 6(58), Article 2825. https://doi.org/10.21105/joss.02825

Strong gravitational lensing, which can make a background source galaxy appears multiple times due to its light rays being deflected by the mass of one or more foreground lens galaxies, provides astronomers with a powerful tool to study dark matter,... Read More about PyAutoLens: Open-Source Strong Gravitational Lensing.

From dwarf galaxies to galaxy clusters: Self-Interacting Dark Matter over 7 orders of magnitude in halo mass (2021)
Journal Article
Bondarenko, K., Sokolenko, A., Boyarsky, A., Robertson, A., Harvey, D., & Revaz, Y. (2021). From dwarf galaxies to galaxy clusters: Self-Interacting Dark Matter over 7 orders of magnitude in halo mass. Journal of Cosmology and Astroparticle Physics, 2021(01), Article 043. https://doi.org/10.1088/1475-7516/2021/01/043

In this paper we study the density profiles of self-interacting dark matter (SIDM) haloes spanning the full observable mass range, from dwarf galaxies to galaxy clusters. Using realistic simulations that model the baryonic physics relevant for galaxy... Read More about From dwarf galaxies to galaxy clusters: Self-Interacting Dark Matter over 7 orders of magnitude in halo mass.

Velocity-dependent self-interacting dark matter from groups and clusters of galaxies (2021)
Journal Article
Sagunski, L., Gad-Nasr, S., Colquhoun, B., Robertson, A., & Tulin, S. (2021). Velocity-dependent self-interacting dark matter from groups and clusters of galaxies. Journal of Cosmology and Astroparticle Physics, 2021(01), Article 024. https://doi.org/10.1088/1475-7516/2021/01/024

We probe the self-interactions of dark matter with relaxed galaxy groups and clusters using observational data from strong and weak lensing and stellar kinematics. Our analysis uses the Jeans formalism and considers a wider range of systematic effect... Read More about Velocity-dependent self-interacting dark matter from groups and clusters of galaxies.

A high-resolution cosmological simulation of a strong gravitational lens (2021)
Journal Article
Richings, J., Frenk, C., Jenkins, A., Robertson, A., & Schaller, M. (2021). A high-resolution cosmological simulation of a strong gravitational lens. Monthly Notices of the Royal Astronomical Society, 501(3), 4657-4668. https://doi.org/10.1093/mnras/staa4013

We present a cosmological hydrodynamical simulation of a 1013 M⊙ galaxy group and its environment (out to 10 times the virial radius) carried out using the EAGLE model of galaxy formation. Exploiting a novel technique to increase the resolution of th... Read More about A high-resolution cosmological simulation of a strong gravitational lens.