A Direct View of the Large-Scale Distribution of Mass, from Weak Gravitational Lensing in the HST COSMOS Survey

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present the first direct maps of the large-scale distribution of mass in the Universe. Measurements of weak gravitational lensing from the Hubble Space Telescope COSMOS survey directly trace the 3D distribution of mass, regardless of its nature or state. They reveal a filamentary network of structures that encompass large voids and meet in massive clusters of galaxies. By comparing this to the stellar mass density from optical and near-infrered observations, and to the distribution of hot gas from XMM observations, we explore the complex relationship between dark matter and the baryons. The HST COSMOS Treasury program was supported through NASA grant HST-GO-09822 and the HST ACS CTE calibration program was supported through NASA grant HST-AR-10964.

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