# Progressive steepening of the SNR RX J1713.7-3946 X-ray spectrum from XMM-Newton to INTEGRAL

## TL;DR

This study presents the first detailed hard X-ray analysis of supernova remnant RX J1713.7-3946, revealing a progressive steepening of its spectrum from soft to hard X-ray energies, with implications for understanding its emission mechanisms.

## Contribution

First detailed hard X-ray imaging and spectral analysis of RX J1713.7-3946 using INTEGRAL, demonstrating spectral steepening across energy ranges for the first time.

## Key findings

- Shell morphology mapped in hard X-rays up to 50 keV.
- Detection of two extended X-ray sources aligned with remnant rims.
- Spectral index increases from ~2 in soft X-rays to ~3 in hard X-rays.

## Abstract

In this work, we present the first detailed analysis of the supernova remnant RX J1713.7-3946 in the hard X-ray energy range with the IBIS coded-mask telescope on board the INTEGRAL observatory. The shell-type morphology of the entire remnant is mapped in hard X-rays for the first time and significantly detected up to 50 keV. The IBIS sky image of RX J1713.7-3946, accumulated over 14 years of operations, demonstrates two extended hard X-ray sources. These sources are spatially consistent with northwest and southwest rims of RX J1713.7-3946 and are also clearly visible at energies below 10 keV with XMM-Newton. This points to a single emission mechanism operating in soft and hard X-rays. The INTEGRAL 17-120 keV spectrum of RX J1713.7-3946 is characterized by a power-law continuum with the photon index of $\Gamma\approx3$, that is significantly softer than $\Gamma\approx2$ determined by XMM-Newton in the 1-10 keV energy range, suggesting a progressive steepening of the spectrum with the energy.