Imaging dark matter at the smallest scales with z≈1 lensed stars

J. M. Diego,Sung Kei Li,Alfred Amruth,Ashish K. Meena, Tom J. Broadhurst,Patrick L. Kelly,Alexei V. Filippenko,Liliya L. R. Williams,Adi Zitrin, William E. Harris,Marta Reina-Campos,Carlo Giocoli,Liang Dai, Mitchell F. Struble,Tommaso Treu,Yoshinobu Fudamoto,Daniel Gilman,Anton M. Koekemoer,Jeremy Lim, J. M. Palencia,Fengwu Sun,Rogier A. Windhorst

arxiv（2024）

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摘要

Observations of caustic-crossing galaxies at redshift 0.72 and the number density of events is greater around substructureand the number density of events is greater around substructures, and (ii) negative imaging regime where β<2. We study the particular case of seven microlensing events found by HST in the Dragon arc (at z=0.725). We find that a population of supergiant stars with a steep LF with β=2.55 fits the distribution of these events. We identify a small region of high density of microlensing events, and interpret it as evidence of a possible invisible substructure, for which we derive a mass of ∼ 1.3 × 10^8 (within its Einstein radius).

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