# Testing general relativity with supermassive black holes using X-ray reflection spectroscopy

## TL;DR

This paper reviews efforts to test General Relativity near supermassive black holes by analyzing X-ray reflection spectra, finding results consistent with the Kerr metric and discussing systematic uncertainties.

## Contribution

It provides the first comprehensive review of observational tests of GR using X-ray reflection spectroscopy on supermassive black holes.

## Key findings

- Results are consistent with general relativity.
- Analyzed 11 sources with multiple X-ray observatories.
- Discussed systematic uncertainties affecting measurements.

## Abstract

In this paper, we review our current efforts to test General Relativity in the strong field regime by studying the reflection spectrum of supermassive black holes. So far we have analyzed 11 sources with observations of NuSTAR, Suzaku, Swift, and XMM-Newton. Our results are consistent with general relativity, according to which the spacetime metric around astrophysical black holes should be well approximated by the Kerr solution. We discuss the systematic uncertainties in our model and we present a preliminary study on the impact of some of them on the measurement of the spacetime metric.