IXPE observation confirms a high spin in the accreting black hole 4U 1957+115

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00586061" target="_blank" >RIV/67985815:_____/24:00586061 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/24:10494059

Výsledek na webu

<a href="https://hdl.handle.net/11104/0354009" target="_blank" >https://hdl.handle.net/11104/0354009</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202348277" target="_blank" >10.1051/0004-6361/202348277</a>

Jazyk výsledku

angličtina

Název v původním jazyce

IXPE observation confirms a high spin in the accreting black hole 4U 1957+115

Popis výsledku v původním jazyce

We present the results of the first X-ray polarimetric observation of the low-mass X-ray binary 4U 1957+115, performed with the Imaging X-ray Polarimetry Explorer in May 2023. The binary system has been in a high-soft spectral state since its discovery and is thought to host a black hole. The similar to 571 ks observation reveals a linear polarisation degree of 1.9% +/- 0.6% and a polarisation angle of41.(degrees)8 +/- 7.(degrees)9 in the 2-8 keV energy range. Spectral modelling is consistent with the dominant contribution coming from the standard accretion disc, while polarimetric data suggest a significant role of returning radiation: photons that are bent by strong gravity effects and forced to return to the disc surface, where they can be reflected before eventually reaching the observer. In this setting, we find that models with a black hole spin lower than 0.96 and an inclination lower than 50(degrees) are disfavoured.

Název v anglickém jazyce

IXPE observation confirms a high spin in the accreting black hole 4U 1957+115

Popis výsledku anglicky

We present the results of the first X-ray polarimetric observation of the low-mass X-ray binary 4U 1957+115, performed with the Imaging X-ray Polarimetry Explorer in May 2023. The binary system has been in a high-soft spectral state since its discovery and is thought to host a black hole. The similar to 571 ks observation reveals a linear polarisation degree of 1.9% +/- 0.6% and a polarisation angle of41.(degrees)8 +/- 7.(degrees)9 in the 2-8 keV energy range. Spectral modelling is consistent with the dominant contribution coming from the standard accretion disc, while polarimetric data suggest a significant role of returning radiation: photons that are bent by strong gravity effects and forced to return to the disc surface, where they can be reflected before eventually reaching the observer. In this setting, we find that models with a black hole spin lower than 0.96 and an inclination lower than 50(degrees) are disfavoured.

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

2024

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

684

Číslo periodika v rámci svazku

April

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

12

Strana od-do

A95

Kód UT WoS článku

001202252600001

EID výsledku v databázi Scopus

2-s2.0-85190657282