Credit & Copyright: X-ray: NASA/CXC/CfA/
M. Markevitch et al.;
Lensing Map: NASA/STScI; ESO WFI; Magellan/U.Arizona/ D.Clowe et al.
Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.
Explanation:
What's the matter with the Bullet Cluster?
This massive cluster of galaxies
(1E 0657-558)
creates
gravitational lens distortions
of background galaxies in a way that has been interpreted as strong evidence for
the leading theory: that
dark matter exists within.
Different recent analyses,
though, indicate that a less popular alternative -- modifying gravity-- could explain
cluster dynamics without
dark
matter, and provide a
more likely progenitor scenario as
well.
Currently, the
two scientific hypotheses are competing to explain the observations: it's
invisible matter
versus amended gravity.
The duel is dramatic as a clear
Bullet-proof example
of dark matter would shatter the simplicity of
modified gravity theories.
For the near future, the battle over the Bullet cluster is likely to continue as
new observations,
computer simulations, and analyses are completed.
The featured image is
a
Hubble/Chandra/Magellan composite with red depicting the
X-rays emitted by hot gas, and blue depicting the suggested
separated dark matter distribution.
Lensing Map: NASA/STScI; ESO WFI; Magellan/U.Arizona/ D.Clowe et al.
Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
Январь Февраль Март Апрель Май Июнь Июль Август Сентябрь Октябрь Ноябрь Декабрь |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
|
Публикации с ключевыми словами:
dark matter - galaxy cluster - темная материя - Скопление галактик
Публикации со словами: dark matter - galaxy cluster - темная материя - Скопление галактик | |
См. также:
Все публикации на ту же тему >> | |
