KYNREFREV - implementation of an X-ray reverberation model in XSPEC

TL;DR

This paper introduces KYNREFREV, a new X-ray reverberation model implemented in XSPEC that simulates time-dependent reflection spectra from accretion discs around Kerr black holes, aiding in the analysis of X-ray time-lags.

Contribution

The paper presents the first implementation of the KYNREFREV reverberation model in XSPEC, enabling detailed simulations of X-ray reflection and time-lags in black hole systems.

Findings

Preliminary analysis of X-ray time-lags from 1H 0707-495.

Preliminary analysis of X-ray time-lags from IRAS 13224-3809.

Model successfully computes relativistic photon paths and disc ionisation profiles.

Abstract

We present briefly the first results obtained by the application of the KYNREFREV-reverberation model, which is ready for its use in XSPEC. This model computes the time dependent reflection spectra of the disc as a response to a flash of primary power-law radiation from a point source corona located on the axis of the black-hole accretion disc. The assumptions of the model are: central Kerr black hole, surrounded by a Keplerian, geometrically thin, optically thick, ionised disc with the possibility of defining the radial density profile and a stationary hot point-like patch of plasma located on the system rotation axis and emitting isotropic power-law radiation (lamp-post geometry). Full relativistic ray-tracing code in vacuum is used for photon paths from the corona to the disc and to the observer and from the disc to the observer. The ionisation of the disc is set for each radius according to the amount of the incident primary flux and the density of the accretion disc. In this paper we comment on some preliminary results obtained through the analysis of X-ray reverberation time-lags from 1H 0707-495 and IRAS 13224-3809.