2016
DOI: 10.17721/2227-1481.6.3-15
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Observation of the new emission line at ~3.5 keV in X-ray spectra of galaxies and galaxy clusters

Abstract: The detection of an unidentified emission line in X-ray spectra of cosmic objects would be a 'smoking gun' signature for particle physics beyond the Standard Model. More than a decade of its extensive searches results in several narrow faint emission lines reported at 3.5, 8.7, 9.4 and 10.1 keV. The most promising of them is the emission line at ∼3.5 keV reported in spectra of several nearby galaxies and galaxy clusters. Here I summarize its up-to-date status, overview its possible interpretations, including a… Show more

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Cited by 27 publications
(28 citation statements)
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“…The detection of an unidentified line was reported recently in the stacked spectrum of galaxy clusters [190], in the individual spectra of nearby galaxy clusters [190,191,622] (see also [612]), in the Andromeda galaxy [191], and in the Galactic Center region [608][609][610], see also [623] for a recent review. The position of the line is E = 3.55 keV with an uncertainty in position ∼ 0.05 keV.…”
Section: 5 Kev Linementioning
confidence: 88%
“…The detection of an unidentified line was reported recently in the stacked spectrum of galaxy clusters [190], in the individual spectra of nearby galaxy clusters [190,191,622] (see also [612]), in the Andromeda galaxy [191], and in the Galactic Center region [608][609][610], see also [623] for a recent review. The position of the line is E = 3.55 keV with an uncertainty in position ∼ 0.05 keV.…”
Section: 5 Kev Linementioning
confidence: 88%
“…4, we find that 7 keV axino DM with entropy dilution factor Δ ¼ 4.7 fits the strongest lower bound from the Ly-α forest data, m WDM ¼ 5.3 keV, very well. 5 It means that we need only a mild entropy dilution factor, Δ > 4.7, to evade the Ly-α forest constraints.…”
Section: Ly-α Forest Constraintsmentioning
confidence: 99%
“…While there are reports of null detection, e.g., in dwarf spheroidal galaxies [4], the decaying dark matter (DM) explanation of the 3.5 keV line excess is yet to be excluded (see Ref. [5] for a thorough review).…”
Section: Introductionmentioning
confidence: 99%
“…There have also been null-detection reports[13][14][15][16][17][18][19][20][21] and claims that the DM interpretation fails to pass consistency checks from line profiles[22,23]. We note that some of the null-detection reports are just not sensitive enough to exclude the DM interpretation (see Refs [24,25]. for summaries) and the failure claims are refuted[26][27][28][29][30].…”
mentioning
confidence: 92%