2005/06/30 by Pengjie Zhang, Ue-Li Pen, Ue‐Li Pen · 55 citations
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #COSMIC cancer database #Cosmology #Dark energy #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Luminosity #Luminosity function #Magnification #Observational cosmology #Optics #Physics #Radio Astronomy Observations and Technology #astro-ph
paper · pdf · doi:10.1103/physrevlett.95.241302
published in Physical Review Letters 95(24), 241302 (American Physical Society) · 4 pages, 1 figures. Discussions added. PRL accepted
arxiv created 2005/11/08 · openalex publication_date 2005/12/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We develop a new tool to generate statistically precise dark matter maps from the cosmic magnification of galaxies with distance estimates. We show how to overcome the intrinsic clustering problem using the slope of the luminosity function, because magnification changes strongly over the luminosity function, while intrinsic clustering only changes weakly. This may allow precision cosmology beyond most current systematic limitations. The Square Kilometre Array is able to reconstruct the projected matter density map at smoothing scale approximately 10' with S/N > or = 1, at the rate of 200-4000 deg2 per year, depending on the abundance and evolution of 21 cm emitting galaxies. This power of mapping dark matter is comparable to, or even better than, that of cosmic shear from deep optical surveys or 21 cm surveys.