The XMM Cluster Survey: new evidence for the 3.5-keV feature in clusters is inconsistent with a dark matter origin
The XMM Cluster Survey: new evidence for the 3.5-keV feature in clusters is inconsistent with a dark matter origin
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XMM 星团调查:星团中 3.5 keV 特征的新证据与暗物质起源不一致
DOI:
10.1093/mnras/staa1829
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发表时间:
2020
影响因子:
4.8
通讯作者:
Bhargava S
中科院分区:
文献类型:
--
作者:
Bhargava S
There have been several reports of a detection of an unexplained excess of X-ray emission at3.5 keV in astrophysical systems. One interpretation of this excess is the decay of sterile neutrino dark matter. The most influential study to date analysed 73 clusters observed by theXMM–Newtonsatellite. We explore evidence for a ≃3.5-keV excess in theXMM-PN spectra of 117 redMaPPer galaxy clusters (0.1 <z< 0.6). In our analysis of individual spectra, we identify three systems with an excess of flux at3.5 keV. In one case (XCS J0003.3+0204), this excess may result from a discrete emission line. None of these systems are the most dark matter dominated in our sample. We group the remaining 114 clusters into four temperature (TX) bins to search for an increase in ≃3.5-keV flux excess withTX– a reliable tracer of halo mass. However, we do not find evidence of a significant excess in flux at ≃3.5 keV in anyTXbins. To maximize sensitivity to a potentially weak dark matter decay feature at ≃3.5 keV, we jointly fit 114 clusters. Again, no significant excess is found at ≃3.5 keV. We estimate the upper limit of an undetected emission line at ≃3.5 keV to be 2.41 × 10−6photons cm−2s−1, corresponding to a mixing angle of sin2(2θ) = 4.4 × 10−11, lower than previous estimates from cluster studies. We conclude that a flux excess at ≃3.5 keV is not a ubiquitous feature in clusters and therefore unlikely to originate from sterile neutrino dark matter decay.
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影响因子:
6.5
作者:
Ben Bekhti, N.;Floer, L.;Staveley-Smith, L.
通讯作者:
Staveley-Smith, L.
影响因子:
4.8
作者:
T. Jeltema;S. Profumo
通讯作者:
S. Profumo
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
S. Riemer
通讯作者:
S. Riemer
影响因子:
4.8
作者:
L. Lovisari;T. Reiprich
通讯作者:
T. Reiprich
DOI:
10.1007/978-3-540-88055-4_34
发表时间:
2009-01
期刊:
arXiv: Earth and Planetary Astrophysics
影响因子:
--
作者:
K. Lodders;H. Palme;H. Gail
通讯作者:
K. Lodders;H. Palme;H. Gail