Abstract: I describe a reanalysis of data sets that have previously been found to harbor evidence for an unidentified X-ray line at 3.5 keV in order to quantify the robustness of earlier results that found significantevidence for a new X-ray line at this energy. The 3.5 keV line is intriguing in part because of possible connections to dark matter. We analyze observations from the XMM-Newton and Chandratelescopes. We investigate the robustness of the evidence for the 3.5 keV line to variations in theanalysis framework and also to numerical error in the chi-square minimization process. For example,we consider narrowing the energy band for the analysis in order to minimize mismodeling effects.The results of our analyses indicate that many of the original 3.5 keV studies (i) did not have fully converged statistical analyses, and (ii) were subject to large systematic uncertainties from backgroundmismodeling. Accounting for these issues we find no statistically significant evidence for a 3.5 keVline in any X-ray data set.
 
Virtual Zoom: https://lbnl.zoom.us/j/215429094