Dark matter-baryons separation at the lowest mass scale: The bullet group
Dark matter-baryons separation at the lowest mass scale: The bullet group
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DOI：
10.1093/mnrasl/slu058
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发表时间：
2014-04
影响因子：
4.8
通讯作者：
F. Gastaldello;F. Gastaldello;M. Limousin;M. Limousin;G. Foëx;Roberto P. Muñoz;T. Verdugo;Verónica Motta;Anupreeta More;Anupreeta More;R. Cabanac;D. Buote;D. Eckert;D. Eckert;S. Ettori;Alexander Fritz;S. Ghizzardi;P. J. Humphrey;M. Meneghetti;M. Rossetti;M. Rossetti
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文献类型：
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作者：
F. Gastaldello;F. Gastaldello;M. Limousin;M. Limousin;G. Foëx;Roberto P. Muñoz;T. Verdugo;Verónica Motta;Anupreeta More;Anupreeta More;R. Cabanac;D. Buote;D. Eckert;D. Eckert;S. Ettori;Alexander Fritz;S. Ghizzardi;P. J. Humphrey;M. Meneghetti;M. Rossetti;M. Rossetti
本文报道了一个总质量为2.4±0.6×1014 M⊙的强透镜选择群SL2S J08544-0121的x射线观测结果，揭示了x射线发射的碰撞气体与由强透镜追踪的无碰撞星系和暗物质（DM）之间的距离为124±20 kpc。这个源允许对DM的相互作用截面的上限进行一个数量级的估计，即10 cm2 g-1。这是迄今为止发现的显示dm -重子分离的质量最低的物体，它揭示了对子弹状物体的探测并不罕见，而且仅限于大质量物体的合并，这为在未来的调查中统计检测dm -重子分离提供了可能性。©2014作者由牛津大学出版社代表皇家天文学会出版。
We report on the X-ray observation of a strong lensing selected group, SL2S J08544-0121, with a total mass of 2.4±0.6×1014 M⊙ which revealed a separation of 124±20 kpc between the X-ray emitting collisional gas and the collisionless galaxies and dark matter (DM), traced by strong lensing. This source allows to put an order of magnitude estimate to the upper limit to the interaction cross-section of DM of 10 cm2 g-1. It is the lowest mass object found to date showing a DM-baryons separation, and it reveals that the detection of bullet-like objects is not rare and confined to mergers of massive objects opening the possibility of a statistical detection of DM-baryons separation with future surveys.© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.