Flux-resolved NuSTAR spectra of 4U 0115+63 show the 10 keV feature maintains constant centroid energy while its flux ratio to the continuum anticorrelates with overall flux, indicating a formation mechanism distinct from both the broadband continuum and the CRSF harmonics.
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Flux variability of the "10 keV feature" of 4U 0115+63
Flux-resolved NuSTAR spectra of 4U 0115+63 show the 10 keV feature maintains constant centroid energy while its flux ratio to the continuum anticorrelates with overall flux, indicating a formation mechanism distinct from both the broadband continuum and the CRSF harmonics.