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Medientyp:
E-Artikel
Titel:
LABORATORY MEASUREMENTS COMPELLINGLY SUPPORT A CHARGE-EXCHANGE MECHANISM FOR THE “DARK MATTER” ∼3.5 keV X-Ray LINE
Beteiligte:
Shah, Chintan;
Dobrodey, Stepan;
Bernitt, Sven;
Steinbrügge, René;
López-Urrutia, José R. Crespo;
Gu, Liyi;
Kaastra, Jelle
Erschienen:
American Astronomical Society, 2016
Erschienen in:The Astrophysical Journal
Sprache:
Nicht zu entscheiden
DOI:
10.3847/1538-4357/833/1/52
ISSN:
0004-637X;
1538-4357
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>ABSTRACT</jats:title>
<jats:p>The reported observations of an unidentified X-ray line feature at ∼3.5 keV have driven a lively discussion about its possible dark matter origin. Motivated by this, we have measured the K-shell X-ray spectra of highly ionized bare sulfur ions following charge exchange with gaseous molecules in an electron beam ion trap, as a source of or a contributor to this X-ray line. We produced S<jats:sup>16+</jats:sup> and S<jats:sup>15+</jats:sup> ions and let them capture electrons in collision with those molecules with the electron beam turned off while recording X-ray spectra. We observed a charge-exchange-induced X-ray feature at the Lyman series limit (3.47 ± 0.06 keV). The inferred X-ray energy is in full agreement with the reported astrophysical observations and supports the novel scenario proposed by Gu et al.</jats:p>