Comptonization in 1E 1740.7-2942 spectra from 2 to 200 keV

TL;DR

This paper analyzes the spectral data of the black hole candidate 1E 1740.7-2942, demonstrating that Comptonization is a key process in producing high-energy X-ray photons across a broad energy range.

Contribution

It provides observational evidence supporting Comptonization as the main mechanism for high-energy emission in 1E 1740.7-2942, aligning with recent theoretical models.

Findings

Comptonization significantly contributes to the high-energy spectra.

Spectral variations are consistent with Comptonization models.

Data from XMM and INTEGRAL support the emission scenario.

Abstract

Studies of the long-term spectral variations have been used to constrain the emission processes of black hole candidates. However, a common scenario which is able to explain the emission from soft to hard X-rays has been proposed only recently. Here, we use XMM and INTEGRAL data on 1E 1740.7-2942 in order to demonstrate that Comptonization plays an important role in producing high energy photons, as predicted by the current modeling scenario.