Relativistic reflection in NGC 4151

Abstract

We investigate the X-ray spectrum of the Seyfert galaxy NGC 4151 using the simultaneous Suzaku/NuSTAR observation and flux-resolved INTEGRAL spectra supplemented by Suzaku and XMM observations. Our best spectral solution indicates that the narrow Fe Kalpha line is produced in Compton-thin matter at the distance of several hundred gravitational radii. In such a model, we find a weak but significant relativistic reflection from a disk truncated at about ten gravitational radii when the source is in bright X-ray states. We do not find evidence either for or against the presence of relativistic reflection in the dim X-ray state. We also rule out models with X-ray emission dominated by a source located very close to the black hole horizon, which was proposed in previous works implementing the lamp-post geometry for this source. We point out that accurate computation of the thermal Comptonization spectrum and its distortion by strong gravity is crucial in applications of the lamp-post geometry to the NuSTAR data.

arXiv commentApJ, in press

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Cited by in corpus (5)

• Towards precision measurements of accreting black holes using X-ray reflection spectroscopy
• Uncovering the geometry of the hot X-ray corona in the Seyfert galaxy NGC4151 with IXPE
• Evolution of accretion disc reflection spectra due to a Type I X-ray burst
• Probing the Extent of Fe K$\alpha$ Emission in Nearby Active Galactic Nuclei using Multi-Order Analysis of Chandra High Energy Transmission Grating Data
• Lamp-post with an outflow and the hard state of Cyg X-1