Yale astronomers discover third dark‑matter‑free dwarf galaxy in a linear chain
A Yale-led team of astronomers has found a third galaxy devoid of dark matter—located alongside the other two in a formation that has never been seen before. Astronomers have followed a faint, cosmic trail of gas to a third galaxy that has no dark matter.
A team led by Yale researchers identified a third dwarf galaxy lacking dark matter, named NGC 1052‑DF9. The galaxy lies 45 million light‑years away and aligns with nine other galaxies in a straight formation. Earlier studies had shown DF2 and DF4 also lack dark matter, a rare observation. The findings suggest these galaxies formed together in a violent event, possibly a high‑speed collision that stripped gas from dark matter. Spectroscopic measurements indicate DF9’s mass matches its visible stars, without the expected dark matter halo. The discovery challenges conventional theories of galaxy formation. Researchers plan further observations to test the collision hypothesis.
It provides rare evidence that could reshape our understanding of dark matter’s role in galaxy formation.
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