The Iron Line Profile from Warped Black Hole Accretion Disks

Abstract

The profile of the fluorescent iron line from black hole accretion disks is a powerful diagnostic of black hole properties, such as spin and inclination. The state-of-the-art, however, considers an accretion disk whose angular momentum is aligned with that of the black hole; this is a very constraining assumption which is unlikely to apply to many or even most astrophysical systems. Here, we present the first simulation of the reflection spectrum from warped accretion disks using a realistic model of the reflected emission based on the xillver code. We present the effects that the radial location of the warp and the tilt angle have on the line profile, and highlight that the results are highly dependent on the azimuth position of the observer relative to the tilt angle. We fit these profiles in XSpec with the standard relxill lamppost model to quantify the effect that neglecting the disk warps has on the inferred black hole spins and inclinations. We show that fits with two-component relxill can be used to derive more accurate spin and inclination estimates.

Accepted for publication in ApJ

References in corpus (5)

• Constraining Black Hole Spin Via X-ray Spectroscopy
• Tomographic reflection modelling of quasi-periodic oscillations in the black hole binary H 1743-322
• Evidence for Returning Disk Radiation in the Black Hole X-ray Binary XTE J1550-564
• Returning radiation in strong gravity around black holes: Reverberation from the accretion disc
• The Polarization of X-rays from Warped Black Hole Accretion Disks

Cited by in corpus (5)

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• Fundamental X-ray Corona Parameters of Swift/BAT AGN
• High-density reflection spectroscopy of black hole X-ray binaries in the hard state
• Time Evolution of Mg II in SDSS J2320+0024: Implications for a Subparsec Binary Supermassive Black Hole System
• The Effects of Complex Accretion Disk Geometry on Broadened Iron K$\alpha$ Lines