X-Ray and optical polarization aligned with the radio jet ejecta in GX 339-4

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00604208" target="_blank" >RIV/67985815:_____/25:00604208 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0365910" target="_blank" >https://hdl.handle.net/11104/0365910</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/2041-8213/ad9913" target="_blank" >10.3847/2041-8213/ad9913</a>

Jazyk výsledku

angličtina

Název v původním jazyce

X-Ray and optical polarization aligned with the radio jet ejecta in GX 339-4

Popis výsledku v původním jazyce

We present the first X-ray polarization measurements of GX 339-4. IXPE observed this source twice during its 2023-2024 outburst, once in the soft-intermediate state and again during a soft state. The observation taken during the intermediate state shows a significant (4 sigma) polarization degree PX = 1.3% +/- 0.3% and polarization angle theta X =74 degrees +/- 7 degrees only in the 3-8 keV band. FORS2 at the Very Large Telescope observed the source simultaneously, detecting optical polarization in the B, V, R, and I bands (between similar to 0.1% and similar to 0.7%), all roughly aligned with the X-ray polarization. We also detect a discrete jet knot from radio observations with the Australia Telescope Compact Array taken later in time, this knot would have been ejected from the system around the same time as the hard-to-soft X-ray state transition, and a bright radio flare occurred similar to 3 months earlier. The proper motion of the jet knot provides a direct measurement of the jet orientation angle on the plane of the sky at the time of the ejection. We find that both the X-ray and optical polarization angles are aligned with the direction of the ballistic jet.

Název v anglickém jazyce

X-Ray and optical polarization aligned with the radio jet ejecta in GX 339-4

Popis výsledku anglicky

We present the first X-ray polarization measurements of GX 339-4. IXPE observed this source twice during its 2023-2024 outburst, once in the soft-intermediate state and again during a soft state. The observation taken during the intermediate state shows a significant (4 sigma) polarization degree PX = 1.3% +/- 0.3% and polarization angle theta X =74 degrees +/- 7 degrees only in the 3-8 keV band. FORS2 at the Very Large Telescope observed the source simultaneously, detecting optical polarization in the B, V, R, and I bands (between similar to 0.1% and similar to 0.7%), all roughly aligned with the X-ray polarization. We also detect a discrete jet knot from radio observations with the Australia Telescope Compact Array taken later in time, this knot would have been ejected from the system around the same time as the hard-to-soft X-ray state transition, and a bright radio flare occurred similar to 3 months earlier. The proper motion of the jet knot provides a direct measurement of the jet orientation angle on the plane of the sky at the time of the ejection. We find that both the X-ray and optical polarization angles are aligned with the direction of the ballistic jet.

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

Astrophysical Journal Letters

ISSN

2041-8205

e-ISSN

2041-8213

Svazek periodika

978

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

L19

Kód UT WoS článku

001389218800001

EID výsledku v databázi Scopus

2-s2.0-85215871343