期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 837, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aa61fa
关键词
dark matter; galaxies: clusters: individual (A426); galaxies: clusters: intracluster medium; X-rays: galaxies: clusters
资金
- NASA Science Mission Directorate
- DoE
- NASA [NNX15AM19G]
- LLNL [DE-AC5207NA27344]
- NASA grants
- European Space Agency
- CNES
- Centre National d'Etudes Spatiales
- NWO
- Netherlands Organization for Scientific Research
- Swiss Secretariat for Education, Research and Innovation SERI
- ESA's PRODEX programme
- Canadian Space Agency
- JSPS/MEXT KAKENHI [15H02070, 15K05107, 23340071, 26109506, 24103002, 25400236, 25800119, 25400237, 25287042, 24540229, 25105516, 23540280, 25400235, 25247028, 26800095, 25400231, 26220703, 24105007, 23340055, 15H00773, 23000004, 15H02090, 15K17610, 15H05438, 15H00785, 24540232]
- JSPS International Research Fellowship
- STFC [ST/L00075X/1]
- JAXA International Top Young Fellowship
- UK Science and Technology Funding Council (STFC) grant [ST/J003697/2]
- ERC Advanced Grant [340442]
- Hungarian Academy of Sciences [LP2016-11]
- [DEAC376SF00515]
- STFC [ST/P004636/1, ST/J003697/2] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J003697/2, ST/N000927/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [23340055, 23540280, 16K17673, 15J01845, 15K17652, 15J10520, 15F14748, 24540237, 24105007, 16K17672, 17K05393, 24103002, 15K17610, 15K05107, 15H00785, 16K05300, 24105001, 25800119, 15K17657, 25287042, 16K05295, 23340071, 16H02198, 15H00773, 17H06357, 16K17667, 16H00949, 15K21679, 16J02333, 16K05296, 16H03954, 25302003, 26800144, 26220703, 26800095, 25247028, 15H06896, 15H02090, 26109506, 24540232, 25105516, 15H03642, 16K13787, 15H02070, 24540229] Funding Source: KAKEN
- NASA [807174, NNX15AM19G] Funding Source: Federal RePORTER
X-ray spectroscopy with Hitomi was expected to resolve the origin of the faint unidentified E approximate to 3.5 keV emission line reported in several low-resolution studies of various massive systems, such as galaxies and clusters, including the Perseus cluster. We have analyzed the Hitomi first-light observation of the Perseus cluster. The emission line expected for Perseus based on the XMM-Newton signal from the large cluster sample under the dark matter decay scenario is too faint to be detectable in the Hitomi data. However, the previously reported 3.5 keV flux from Perseus was anomalously high compared to the sample-based prediction. We find no unidentified line at the reported high flux level. Taking into account the XMM measurement uncertainties for this region, the inconsistency with Hitomi is at a 99% significance for a broad dark matter line and at 99.7% for a narrow line from the gas. We do not find anomalously high fluxes of the nearby faint K line or the Ar satellite line that were proposed as explanations for the earlier 3.5 keV detections. We do find a hint of a broad excess near the energies of high-n transitions of S XVI (E similar or equal to 3.44 keV rest-frame)-a possible signature of charge exchange in the molecular nebula and another proposed explanation for the unidentified line. While its energy is consistent with XMM pn detections, it is unlikely to explain the MOS signal. A confirmation of this interesting feature has to wait for a more sensitive observation with a future calorimeter experiment.
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