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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
X-Ray and optical polarization aligned with the radio jet ejecta in GX 339-4
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
<a href="/en/project/GX21-06825X" target="_blank" >GX21-06825X: Accreting Black Holes in the new era of X-ray polarimetry missions</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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