Deep XMM observations of Draco rule out at the 99 per cent confidence level a dark matter decay origin for the 3.5 keV line
Deep XMM observations of Draco rule out at the 99 per cent confidence level a dark matter decay origin for the 3.5 keV line
复制标题
Draco 的深度 XMM 观测以 99% 的置信水平排除了 3.5 keV 线的暗物质衰变起源
DOI：
10.1093/mnras/stw578
复制
发表时间：
2015
影响因子：
4.8
通讯作者：
S. Profumo
中科院分区：
文献类型：
--
作者：
T. Jeltema;S. Profumo
作者(S)：Jeltema，Tesla；Proumo，Stefano|摘要：我们寻找了一条能量约3.5keV的X射线线，对矮球星系Draco进行了~1.6毫秒的XMM-牛顿观测。在MOS或PN探测器中均未发现线条。在这个能量范围内的数据完全符合一个单一的，展开的幂定律模拟粒子背景，在这些能量下，加上仪器谱线；增加一个~3.5keV的谱线特征并不能改善拟合。线通量的相应上限排除了3.5keV线的暗物质衰变起源的可能性，这条线是在对星系团和银河系中心大于99%C.L.的观测中发现的。
Author(s): Jeltema, Tesla; Profumo, Stefano | Abstract: We searched for an X-ray line at energies around 3.5 keV in deep, ~1.6 Msec XMM-Newton observations of the dwarf spheroidal galaxy Draco. No line was found in either the MOS or the PN detectors. The data in this energy range are completely consistent with a single, unfolded power law modeling the particle background, which dominates at these energies, plus instrumental lines; the addition of a ~3.5 keV line feature gives no improvement to the fit. The corresponding upper limit on the line flux rules out a dark matter decay origin for the 3.5 keV line found in observations of clusters of galaxies and in the Galactic Center at greater than 99% C.L..