NICER data show Mrk 421 varying ~28x in X-ray flux with log-parabolic spectra, harder-when-brighter behavior, and spectral parameter correlations linked to particle acceleration.
G., Bazer-Bachi, A
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NICER Perspective on TeV Blazar Mrk~421: X-ray Variability and Particle Acceleration
NICER data show Mrk 421 varying ~28x in X-ray flux with log-parabolic spectra, harder-when-brighter behavior, and spectral parameter correlations linked to particle acceleration.