Simultaneous detection of an intrinsic absorber and a compact jet emission in the X-ray binary IGR J17091-3624 during a hard accretion state

TL;DR

This study analyzes X-ray and radio observations of the black hole binary IGR J17091-3624 during a state transition, revealing a simultaneous intrinsic ionized absorber and a compact jet, advancing understanding of accretion processes.

Contribution

It provides the first simultaneous detection of an intrinsic ionized absorber and a compact jet in a black hole X-ray binary during a state transition.

Findings

Intrinsic ionized absorber identified in the third observation

Presence of a compact jet confirmed during all observations

Absorber characterized by specific ionization parameters and elements

Abstract

We present a detailed analysis of three XMM-Newton observations of the black hole low-mass X-ray binary IGR~J17091-3624 taken during its 2016 outburst. Radio observations obtained with the Australia Telescope Compact Array (ATCA) indicate the presence of a compact jet during all observations. From the best X-ray data fit results we concluded that the observations were taken during a transition from a hard accretion state to a hard-intermediate accretion state. For Observations 1 and 2 a local absorber can be identified in the EPIC-pn spectra but not in the RGS spectra, preventing us from distinguishing between absorption local to the source and that from the hot ISM component. For Observation 3, on the other hand, we have identified an intrinsic ionized static absorber in both EPIC-pn and RGS spectra. The absorber, observed simultaneously with a compact jet emission, is characterized by an ionization parameter of 1.96< log({\xi}) <2.05 and traced mainly by Ne X, Mg XII, Si XIII and Fe XVIII.