%0 Generic %1 keshet2021protruding %A Keshet, Uri %A Raveh, Itay %A Naor, Yossi %D 2021 %K tifr %T Protruding bullet heads indicating dark matter pull %U http://arxiv.org/abs/2101.06271 %X A clump moving through the intracluster medium of a galaxy cluster can drive a bow shock trailed by a bullet-like core. In some cases, such as in the prototypical Bullet cluster, X-rays show a gas bullet with a protruding head and pronounced shoulders. We point out that these features, while difficult to explain without dark matter (DM), naturally arise as the head of the slowed-down gas is gravitationally pulled forward toward its unhindered DM counterpart. X-ray imaging thus provides a unique, robust probe of the offset, collisionless DM, even without gravitational lensing or other auxiliary data. Numerical simulations and a toy model suggest that the effect is common in major mergers, is often associated with a small bullet-head radius of curvature, and may lead to distinct bullet morphologies, consistent with observations.

@misc{keshet2021protruding, abstract = {A clump moving through the intracluster medium of a galaxy cluster can drive a bow shock trailed by a bullet-like core. In some cases, such as in the prototypical Bullet cluster, X-rays show a gas bullet with a protruding head and pronounced shoulders. We point out that these features, while difficult to explain without dark matter (DM), naturally arise as the head of the slowed-down gas is gravitationally pulled forward toward its unhindered DM counterpart. X-ray imaging thus provides a unique, robust probe of the offset, collisionless DM, even without gravitational lensing or other auxiliary data. Numerical simulations and a toy model suggest that the effect is common in major mergers, is often associated with a small bullet-head radius of curvature, and may lead to distinct bullet morphologies, consistent with observations.}, added-at = {2021-01-19T06:16:22.000+0100}, author = {Keshet, Uri and Raveh, Itay and Naor, Yossi}, biburl = {https://www.bibsonomy.org/bibtex/205295e085adfe7acde83104318be16fe/citekhatri}, description = {Protruding bullet heads indicating dark matter pull}, interhash = {d40bfeb35d1148d1d32d0121ffd545c3}, intrahash = {05295e085adfe7acde83104318be16fe}, keywords = {tifr}, note = {cite arxiv:2101.06271Comment: 9 pages, 3 figures, comments welcome}, timestamp = {2021-01-19T06:16:22.000+0100}, title = {Protruding bullet heads indicating dark matter pull}, url = {http://arxiv.org/abs/2101.06271}, year = 2021 }