The very high X-ray polarization of accreting black hole IGR J17091-3624 in the hard state

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00637872" target="_blank" >RIV/67985815:_____/25:00637872 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0368699" target="_blank" >https://hdl.handle.net/11104/0368699</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/staf859" target="_blank" >10.1093/mnras/staf859</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The very high X-ray polarization of accreting black hole IGR J17091-3624 in the hard state

Popis výsledku v původním jazyce

We report the first detection of the X-ray polarization of the transient black hole X-ray binary IGR J17091-3624 taken with the Imaging X-ray polarimetry Explorer (IXPE) in 2025 March, and present the results of an X-ray spectropolarimetric analysis. The polarization was measured in the 2-8 keV band with 5.2 sigma statistical confidence. We report a polarization degree (PD) of 9.1 +/- 1.6 per cent and a polarization angle of 83 degrees +/- 5 degrees (errors are 1 sigma confidence). There is a hint of a positive correlation of PD with energy that is not statistically significant. We report that the source is in the corona-dominated hard state, which is confirmed by a hard power-law-dominated spectrum with weak reflection features and the presence of a Type-C quasi-periodic oscillation at similar to 0.2 Hz. The orientation of the emitted radio jet is not known, and so we are unable to compare it with the direction of X-ray polarization, but we predict the two to be parallel if the geometry is similar to that in Cygnus X-1 and Swift J1727.8-1613, the two hard state black hole binaries previously observed by IXPE. In the Comptonization scenario, the high observed PD requires a very favourable geometry of the corona, a high inclination angle (supported by the presence of a dip in the light curve) and possibly a mildly relativistic outflow and/or scattering in an optically thick wind.

Název v anglickém jazyce

The very high X-ray polarization of accreting black hole IGR J17091-3624 in the hard state

Popis výsledku anglicky

We report the first detection of the X-ray polarization of the transient black hole X-ray binary IGR J17091-3624 taken with the Imaging X-ray polarimetry Explorer (IXPE) in 2025 March, and present the results of an X-ray spectropolarimetric analysis. The polarization was measured in the 2-8 keV band with 5.2 sigma statistical confidence. We report a polarization degree (PD) of 9.1 +/- 1.6 per cent and a polarization angle of 83 degrees +/- 5 degrees (errors are 1 sigma confidence). There is a hint of a positive correlation of PD with energy that is not statistically significant. We report that the source is in the corona-dominated hard state, which is confirmed by a hard power-law-dominated spectrum with weak reflection features and the presence of a Type-C quasi-periodic oscillation at similar to 0.2 Hz. The orientation of the emitted radio jet is not known, and so we are unable to compare it with the direction of X-ray polarization, but we predict the two to be parallel if the geometry is similar to that in Cygnus X-1 and Swift J1727.8-1613, the two hard state black hole binaries previously observed by IXPE. In the Comptonization scenario, the high observed PD requires a very favourable geometry of the corona, a high inclination angle (supported by the presence of a dip in the light curve) and possibly a mildly relativistic outflow and/or scattering in an optically thick wind.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GX21-06825X" target="_blank" >GX21-06825X: Akreující černé díry v nové éře polarizačních rentgenových misí</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

541

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

1774-1781

Kód UT WoS článku

001530104300001

EID výsledku v databázi Scopus

2-s2.0-105011330815