Cosmology from UNIONS weak lensing profiles of galaxy clusters
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| Autores principales: | , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2025
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| author | Mpetha, Charlie T. Taylor, James E. Amoura, Yuba Haggar, Roan de Boer, Thomas Guerrini, Sacha Guinot, Axel Peters, Fabian Hervas Hildebrandt, Hendrik Hudson, Michael J. Kilbinger, Martin Liaudat, Tobias McConnachie, Alan Van Waerbeke, Ludovic Wittje, Anna |
| author_facet | Mpetha, Charlie T. Taylor, James E. Amoura, Yuba Haggar, Roan de Boer, Thomas Guerrini, Sacha Guinot, Axel Peters, Fabian Hervas Hildebrandt, Hendrik Hudson, Michael J. Kilbinger, Martin Liaudat, Tobias McConnachie, Alan Van Waerbeke, Ludovic Wittje, Anna |
| contents | Cosmological information is encoded in the structure of galaxy clusters. In Universes with less matter and larger initial density perturbations, clusters form earlier and have more time to accrete material, leading to a more extended infall region. Thus, measuring the mean mass distribution in the infall region provides a novel cosmological test. The infall region is largely insensitive to baryonic physics, and provides a cleaner structural test than other measures of cluster assembly time such as concentration. We consider cluster samples from three publicly available galaxy cluster catalogues: the Spectroscopic Identification of eROSITA Sources (SPIDERS) catalogue, the X-ray and Sunyaev-Zeldovich effect selected clusters in the meta-catalogue M2C, and clusters identified in the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Survey. Using a preliminary shape catalogue from the Ultraviolet Near Infrared Optical Northern Survey (UNIONS), we derive excess surface mass density profiles for each sample. We then compare the mean profile for the DESI Legacy sample, which is the most complete, to predictions from a suite of simulations covering a range of $Ω_{\rm m}$ and $σ_8$, obtaining constraints of $Ω_{\rm m}=0.34\pm 0.06$ and $σ_8=0.77 \pm 0.04$. We also measure mean (comoving) splashback radii for SPIDERS, M2C and DESI Legacy Imaging Survey clusters of $1.39^{+0.21}_{-0.18} {\rm cMpc}$, $1.77^{+0.20}_{-0.18} {\rm cMpc}/h$ and $1.42^{+0.11}_{-0.12} {\rm cMpc}/h$ respectively. Performing this analysis with the final UNIONS shape catalogue and the full sample of spectroscopically observed clusters in DESI, we can expect to improve on the best current constraints from cluster abundance studies by a factor of 2 or more. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09147 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmology from UNIONS weak lensing profiles of galaxy clusters Mpetha, Charlie T. Taylor, James E. Amoura, Yuba Haggar, Roan de Boer, Thomas Guerrini, Sacha Guinot, Axel Peters, Fabian Hervas Hildebrandt, Hendrik Hudson, Michael J. Kilbinger, Martin Liaudat, Tobias McConnachie, Alan Van Waerbeke, Ludovic Wittje, Anna Cosmology and Nongalactic Astrophysics Cosmological information is encoded in the structure of galaxy clusters. In Universes with less matter and larger initial density perturbations, clusters form earlier and have more time to accrete material, leading to a more extended infall region. Thus, measuring the mean mass distribution in the infall region provides a novel cosmological test. The infall region is largely insensitive to baryonic physics, and provides a cleaner structural test than other measures of cluster assembly time such as concentration. We consider cluster samples from three publicly available galaxy cluster catalogues: the Spectroscopic Identification of eROSITA Sources (SPIDERS) catalogue, the X-ray and Sunyaev-Zeldovich effect selected clusters in the meta-catalogue M2C, and clusters identified in the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Survey. Using a preliminary shape catalogue from the Ultraviolet Near Infrared Optical Northern Survey (UNIONS), we derive excess surface mass density profiles for each sample. We then compare the mean profile for the DESI Legacy sample, which is the most complete, to predictions from a suite of simulations covering a range of $Ω_{\rm m}$ and $σ_8$, obtaining constraints of $Ω_{\rm m}=0.34\pm 0.06$ and $σ_8=0.77 \pm 0.04$. We also measure mean (comoving) splashback radii for SPIDERS, M2C and DESI Legacy Imaging Survey clusters of $1.39^{+0.21}_{-0.18} {\rm cMpc}$, $1.77^{+0.20}_{-0.18} {\rm cMpc}/h$ and $1.42^{+0.11}_{-0.12} {\rm cMpc}/h$ respectively. Performing this analysis with the final UNIONS shape catalogue and the full sample of spectroscopically observed clusters in DESI, we can expect to improve on the best current constraints from cluster abundance studies by a factor of 2 or more. |
| title | Cosmology from UNIONS weak lensing profiles of galaxy clusters |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2501.09147 |