First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820-303

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00576952" target="_blank" >RIV/67985815:_____/23:00576952 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0347226" target="_blank" >https://hdl.handle.net/11104/0347226</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/2041-8213/acec6e" target="_blank" >10.3847/2041-8213/acec6e</a>

Jazyk výsledku

angličtina

Název v původním jazyce

First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820-303

Popis výsledku v původním jazyce

This paper reports the first detection of polarization in the X-rays for atoll-source 4U 1820-303, obtained with the Imaging X-ray Polarimetry Explorer (IXPE) at 99.999% confidence level (CL). Simultaneous polarimetric measurements were also performed in the radio with the Australia Telescope Compact Array. The IXPE observations of 4U 1820-303 were coordinated with Swift X-ray Telescope, Neutron Star Interior Composition Explorer, and Nuclear Spectroscopic Telescope Array aiming to obtain an accurate X-ray spectral model covering a broad energy interval. The source shows a significant polarization above 4 keV, with a polarization degree of 2.0% & PLUSMN, 0.5% and a polarization angle of 55 & DEG, & PLUSMN, 7 & DEG, in the 4-7 keV energy range, and a polarization degree of 10% & PLUSMN, 2% and a polarization angle of67 & DEG, & PLUSMN, 7 & DEG, in the 7-8 keV energy bin. This polarization also shows a clear energy trend with polarization degree increasing with energy and a hint for a position-angle change of & SIME, 90 & DEG, at 96% CL around 4 keV. The spectro-polarimetric fit indicates that the accretion disk is polarized orthogonally to the hard spectral component, which is presumably produced in the boundary/spreading layer. We do not detect linear polarization from the radio counterpart, with a 3 & sigma, upper limit of 50% at 7.25 GHz.

Název v anglickém jazyce

First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820-303

Popis výsledku anglicky

This paper reports the first detection of polarization in the X-rays for atoll-source 4U 1820-303, obtained with the Imaging X-ray Polarimetry Explorer (IXPE) at 99.999% confidence level (CL). Simultaneous polarimetric measurements were also performed in the radio with the Australia Telescope Compact Array. The IXPE observations of 4U 1820-303 were coordinated with Swift X-ray Telescope, Neutron Star Interior Composition Explorer, and Nuclear Spectroscopic Telescope Array aiming to obtain an accurate X-ray spectral model covering a broad energy interval. The source shows a significant polarization above 4 keV, with a polarization degree of 2.0% & PLUSMN, 0.5% and a polarization angle of 55 & DEG, & PLUSMN, 7 & DEG, in the 4-7 keV energy range, and a polarization degree of 10% & PLUSMN, 2% and a polarization angle of67 & DEG, & PLUSMN, 7 & DEG, in the 7-8 keV energy bin. This polarization also shows a clear energy trend with polarization degree increasing with energy and a hint for a position-angle change of & SIME, 90 & DEG, at 96% CL around 4 keV. The spectro-polarimetric fit indicates that the accretion disk is polarized orthogonally to the hard spectral component, which is presumably produced in the boundary/spreading layer. We do not detect linear polarization from the radio counterpart, with a 3 & sigma, upper limit of 50% at 7.25 GHz.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal Letters

ISSN

2041-8205

e-ISSN

2041-8213

Svazek periodika

953

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

L22

Kód UT WoS článku

001053502200001

EID výsledku v databázi Scopus

2-s2.0-85169325138