Journal
ASTROPHYSICAL JOURNAL
Volume 751, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/751/2/82
Keywords
dark matter; galaxies: dwarf; galaxies: individual (Willman 1); X-rays: galaxies
Categories
Funding
- NASA ADAP [NNX11AD36G]
- DOE [DE-FG03-91ER40662]
- ESA Member States
- USA (NASA)
- NASA [NNX11AD36G, 149028] Funding Source: Federal RePORTER
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We report the results of a search for an emission line from radiatively decaying dark matter in the ultra-faint dwarf spheroidal galaxy Willman 1 based on analysis of spectra extracted from XMM-Newton X-ray Observatory data. The observation follows up our analysis of Chandra data of Willman 1 that resulted in line flux upper limits over the Chandra bandpass and evidence of a 2.5 keV feature at a significance below the 99% confidence threshold used to define the limits. The higher effective area of the XMM-Newton detectors, combined with application of recently developing methods for extended-source analysis, allows us to derive improved constraints on the combination of mass and mixing angle of the sterile neutrino dark matter candidate. We do not confirm the Chandra evidence for a 2.5 keV emission line.
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