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Observations of X-ray reverberation around black holes

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arxiv 1812.08578 v1 pith:PXVRKAOO submitted 2018-12-20 astro-ph.HE

classification astro-ph.HE
keywords x-raylagsreverberationaccretingaccretionblackemissionflow
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The X-ray emission from accreting black hole (BH) systems displays strong variability. Short reverberation lags are expected between the primary hard X-ray continuum and the reprocessed disc emission. These lags depend on light-travel distances, thus offering the opportunity to map the geometry of the innermost accretion flow. X-ray reverberation lags have been observed in several BH accreting systems. In radio quiet active galactic nuclei (AGN) these lags scale with BH mass and point to a reprocessing region located close to the Comptonizing X-ray corona. On the other hand, reverberation lags detected in the hard state of some BH X-ray binaries (BHXRB) suggest a different accretion flow geometry than in AGN, showing evidence of evolution as a function of luminosity.

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Cited by 1 Pith paper

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  1. HALO II: Constraining Hubble constant $H_{0}$ through continuum delay fitting of Fairall 9

    astro-ph.GA 2026-06 unverdicted novelty 6.0 of 10

    Using simultaneous modeling of continuum lag-spectrum and broadband SED of Fairall 9 with the H0RIZON-AGN model, the authors obtain H0 = 72.4_{-3.7}^{+3.4} km s^{-1} Mpc^{-1}.

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