X-Ray polarimetry of the dipping accreting neutron star 4U 1624-49

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00584790" target="_blank" >RIV/67985815:_____/24:00584790 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0353668" target="_blank" >https://hdl.handle.net/11104/0353668</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ad235a" target="_blank" >10.3847/1538-4357/ad235a</a>

Jazyk výsledku

angličtina

Název v původním jazyce

X-Ray polarimetry of the dipping accreting neutron star 4U 1624-49

Popis výsledku v původním jazyce

We present the first X-ray polarimetric study of the dipping accreting neutron star 4U 1624-49 with the Imaging X-ray Polarimetry Explorer. We report a detection of polarization in the nondip time intervals with a confidence level of 99.99%. We find an average polarization degree (PD) of 3.1% +/- 0.7% and a polarization angle of 81 degrees +/- 6 degrees east of north in the 2-8 keV band. We report an upper limit on the PD of 22% during the X-ray dips with 95% confidence. The PD increases with energy, reaching from 3.0% +/- 0.9% in the 4-6 keV band to 6% +/- 2% in the 6-8 keV band. This indicates the polarization likely arises from Comptonization. The high PD observed is unlikely to be produced by Comptonization in the boundary layer or spreading layer alone. It can be produced by the addition of an extended geometrically thin slab corona covering part of the accretion disk, as assumed in previous models of dippers, and/or a reflection component from the accretion disk.

Název v anglickém jazyce

X-Ray polarimetry of the dipping accreting neutron star 4U 1624-49

Popis výsledku anglicky

We present the first X-ray polarimetric study of the dipping accreting neutron star 4U 1624-49 with the Imaging X-ray Polarimetry Explorer. We report a detection of polarization in the nondip time intervals with a confidence level of 99.99%. We find an average polarization degree (PD) of 3.1% +/- 0.7% and a polarization angle of 81 degrees +/- 6 degrees east of north in the 2-8 keV band. We report an upper limit on the PD of 22% during the X-ray dips with 95% confidence. The PD increases with energy, reaching from 3.0% +/- 0.9% in the 4-6 keV band to 6% +/- 2% in the 6-8 keV band. This indicates the polarization likely arises from Comptonization. The high PD observed is unlikely to be produced by Comptonization in the boundary layer or spreading layer alone. It can be produced by the addition of an extended geometrically thin slab corona covering part of the accretion disk, as assumed in previous models of dippers, and/or a reflection component from the accretion disk.

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

2024

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Svazek periodika

963

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

133

Kód UT WoS článku

001184955400001

EID výsledku v databázi Scopus

2-s2.0-85187521328