Pulsed fraction spectra from XMM-Newton and NuSTAR on Vela X-1 agree within 5% after instrumental corrections and reveal emission-line and cyclotron features whose strength varies with orbital absorption.
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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.
citing papers explorer
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Energy-resolved pulse profiles of Vela X-1: cross-calibrating XMM-Newton and NuSTAR to trace spectral features
Pulsed fraction spectra from XMM-Newton and NuSTAR on Vela X-1 agree within 5% after instrumental corrections and reveal emission-line and cyclotron features whose strength varies with orbital absorption.
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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.