Details

Autor(en) / Beteiligte

• Rani, B.
• Mundo, S. A.
• Mushotzky, R.
• Lien, A. Y.
• Gurwell, M. A.
• Kim, J. Y.

Titel

Hard X-Ray Emission in Centaurus A

Ist Teil von

• The Astrophysical journal, 2022-06, Vol.932 (2), p.104

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2022

Link zum Volltext

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• 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.