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Milky Way gravity and dark matter signature research

Overview

Research from the University of Washington suggests that irregularities in stellar streams orbiting the Milky Way may be caused by the galaxy’s own complex gravitational field rather than by dark matter.

Astronomers have traditionally interpreted gaps, kinks, and clumps in these long, thin trails of stars as evidence of invisible dark matter subhalos passing nearby. However, simulations of approximately 15,000 stellar streams across four Milky Way-sized galaxies indicate that realistic galactic gravity can produce similar structural variations, such as bends and wiggles, even without dark matter encounters.

The study, published in The Astrophysical Journal, found that after five billion years, only about 70 of the 15,000 simulated streams remained featureless. These findings suggest that the Milky Way’s inherent gravitational irregularities can mimic the effects previously attributed to dark matter, complicating the use of star streams as a reliable tool for mapping the substance.

Entities

University of Washington · Milky Way

Timeline

  1. 8 days ago

    [TECHNOLOGY] 2 sources
    Milky Way gravity may mimic dark matter effects in star streams

    New simulations suggest that irregularities in Milky Way star streams may result from the galaxy's own gravity rather than dark matter concentrations, challenging previous methods of detecting dark matter.

  2. 16 days ago

    [TECHNOLOGY] 2 sources
    University of Washington study suggests Milky Way gravity may mimic dark matter signatures

    University of Washington astronomers found that Milky Way gravity can create irregularities in stellar streams, potentially mimicking the gravitational effects of dark matter.

Sources

knowridge.com · naukawpolsce.pap.pl · spidersweb.pl · thebrighterside.news