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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New NuSTAR data on Vela X-1 show no long-term decay in the harmonic cyclotron line energy, irregular evolution of the fundamental line, and a non-canonical line energy ratio indicating formation at different heights in the accretion column.
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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Cyclotron Line Variability and Accretion Dynamics in Vela X-1
New NuSTAR data on Vela X-1 show no long-term decay in the harmonic cyclotron line energy, irregular evolution of the fundamental line, and a non-canonical line energy ratio indicating formation at different heights in the accretion column.