Science, Space and Technology News 2024
JWST discovered the ancient galaxy JWST-ER1g, featuring a unique Einstein ring that aids in studying the galaxy’s high dark matter density and testing dark matter properties. Credit: Van Dokkum et al. 2023discovered an ancient galaxy, JWST-ER1g, which exhibits a phenomenon called strong gravitational lensing, forming an Einstein ring. This galaxy, rich in dark matter, provides new insights into dark matter’s properties and density.
“When ordinary matter — pristine gas and stars — collapses and condenses into the dark matter halo of JWST-ER1g, it may be compressing the halo, leading to a high density,” said Demao Kong, a second-year graduate student at UCR, who led the analysis. “Our numerical studies show that this mechanism can explain the high dark matter density of JWST-ER1g — more dark matter mass in the same volume, resulting in higher density.
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