Self-interacting dark matter and small-scale gravitational lenses in galaxy clusters

Yang, Daneng; Yu, Hai-Bo

doi:10.1103/physrevd.104.103031

Self-interacting dark matter and small-scale gravitational lenses in galaxy clusters

Journal Article · Mon Nov 01 00:00:00 EDT 2021 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.104.103031· OSTI ID:1979953

^[1]; ^[2]

Tsinghua Univ., Beijing (China); OSTI
Univ. of California, Riverside, CA (United States)

Recently, Meneghetti et al. reported an excess of small-scale gravitational lenses in galaxy clusters. We study its implications for self-interacting dark matter (SIDM) compared with standard cold dark matter (CDM). We design controlled N-body simulations that incorporate observational constraints. The presence of early-type galaxies in cluster substructures can deepen gravitational potential and reduce tidal mass loss. Both scenarios require a relatively high baryon concentration in the substructure to accommodate the lensing measurements, and their tangential caustics are similar. The SIDM substructure can experience gravothermal collapse and produce a steeper density profile than its CDM counterpart, leading to a larger radial galaxy-galaxy strong-lensing cross section, although this effect is hard to observe. Our results indicate that SIDM can provide a unified explanation to small-scale lenses in galaxy clusters and stellar motion in dwarf galaxies.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: John Templeton Foundation; NSFC; National Key Research and Development Program of China; USDOE Office of Science (SC)

Grant/Contract Number:: SC0008541

OSTI ID:: 1979953

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 10 Vol. 104; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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