Protruding bullet heads indicating dark matter pull
U. Keshet, I. Raveh, and Y. Naor. (2021)cite arxiv:2101.06271Comment: 9 pages, 3 figures, comments welcome.
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.
Description
Protruding bullet heads indicating dark matter pull
%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
}