{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/observational-constraints-on-the-sub-galactic","title":"Probing sub-galactic mass structure with the power spectrum of surface-brightness anomalies in high-resolution observations of galaxy-galaxy strong gravitational lenses. II.Observational constraints on the sub-galactic matter power spectrum","arxiv_id":"1803.05952","date":"2018-03-15","proceeding":null,"authors":["D. Bayer","S. Chatterjee","L. V. E. Koopmans","S. Vegetti","J. P. McKean","T. Treu","C. D. Fassnacht","K. Glazebrook"],"abstract":"Stringent observational constraints on the sub-galactic matter power spectrum would allow one to distinguish between the concordance $\\Lambda$CDM and the various alternative dark-matter models that predict significantly different properties of mass structure in galactic haloes. Galaxy-galaxy strong gravitational lensing provides a unique opportunity to probe the sub-galactic mass structure in lens galaxies beyond the Local Group. Here, we demonstrate the first application of a novel methodology to observationally constrain the sub-galactic matter power spectrum in the inner regions of massive elliptical lens galaxies on 1-10 kpc scales from the power spectrum of surface-brightness anomalies in highly magnified galaxy-scale Einstein rings and gravitational arcs. The pilot application of our approach to Hubble Space Telescope (HST/WFC3/F390W) observations of the SLACS lens system SDSS J0252+0039 allows us to place the following observational constraints (at the 99 per cent confidence level) on the dimensionless convergence power spectrum $\\Delta^{2}_{\\delta\\kappa}$ and the standard deviation in the aperture mass $\\sigma_{\\rm AM}$: $\\Delta^{2}_{\\delta\\kappa}<1$ ($\\sigma_{\\rm AM}< 0.8 \\times 10^8 M_\\odot$) on 0.5-kpc scale, $\\Delta^{2}_{\\delta\\kappa}<0.1$ ($\\sigma_{\\rm AM}< 1 \\times 10^8 M_\\odot$) on 1-kpc scale and $\\Delta^{2}_{\\delta\\kappa}<0.01$ ($\\sigma_{\\rm AM}< 3 \\times 10^8 M_\\odot$) on 3-kpc scale. These first upper-limit constraints still considerably exceed the estimated effect of CDM subhaloes. However, future analysis of a larger sample of galaxy-galaxy strong lens systems can substantially narrow down these limits and possibly rule out dark-matter models that predict a significantly higher level of density fluctuations on the critical sub-galactic scales.","url_abs":"https://arxiv.org/abs/1803.05952v2","url_pdf":"https://arxiv.org/pdf/1803.05952v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"observational-constraints-on-the-sub-galactic","repo_url":"https://github.com/SaikatPhys/strong-galaxy-lensing-simulation","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}