Hard X-Ray Emission in Centaurus A

  • Rani B
  • Mundo S
  • Mushotzky R
  • et al.
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Abstract

We use 13 yr of Swift/BAT observations to probe the nature and origin of the hard X-ray (14–195 KeV) emission in Centaurus A. Since the beginning of the Swift operation in 2004, significant X-ray variability in the 14–195 KeV band has been detected, with mild changes in the source spectrum. Spectral variations became more eminent after 2013, following a softer-when-brighter trend. Using the power spectral density (PSD) method, we find that the observed hard X-ray photon flux variations are consistent with a red-noise process of slope, −1.3, with no evidence for a break in the PSD. We find a significant correlation between the hard X-ray and 230 GHz radio flux variations, with no time delay longer than 30 days. The temporal and spectral analysis confirms that the X-ray emission generated by the accretion in the ADAF model is sub-dominant as compared with the emission arising from that produced by the inner regions of the radio jet.

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APA

Rani, B., Mundo, S. A., Mushotzky, R., Lien, A. Y., Gurwell, M. A., & Kim, J. Y. (2022). Hard X-Ray Emission in Centaurus A. The Astrophysical Journal, 932(2), 104. https://doi.org/10.3847/1538-4357/ac6fd4

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