Počet záznamů: 1
Dramatic drop in the X-ray polarization of Swift J1727.8-1613 in the soft spectral state
- 1.
SYSNO ASEP 0586062 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Dramatic drop in the X-ray polarization of Swift J1727.8-1613 in the soft spectral state Tvůrce(i) Svoboda, Jiří (ASU-R) RID, ORCID
Dovčiak, Michal (ASU-R) RID, ORCID
Steiner, J.F. (US)
Kaaret, P. (US)
Podgorný, Jakub (ASU-R)
Brigitte, Maimouna (ASU-R)
Datta, Sudeb Ranjan (ASU-R)Celkový počet autorů 37 Číslo článku L35 Zdroj.dok. Astrophysical Journal Letters. - : Institute of Physics Publishing - ISSN 2041-8205
Roč. 966, č. 2 (2024)Poč.str. 9 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova black hole physics ; X-ray astronomy ; polarimetry Obor OECD Astronomy (including astrophysics,space science) CEP GX21-06825X GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora ASU-R - RVO:67985815 UT WOS 001215805800001 EID SCOPUS 85193022270 DOI https://doi.org/10.3847/2041-8213/ad402e Anotace Black hole X-ray binaries exhibit different spectral and timing properties in different accretion states. The X-ray outburst of a recently discovered and extraordinarily bright source, Swift J1727.8-1613, has enabled the first investigation of how the X-ray polarization properties of a source evolve with spectral state. The 2-8 keV polarization degree was previously measured by the Imaging X-ray Polarimetry Explorer (IXPE) to be approximate to 4% in the hard and hard intermediate states. Here we present new IXPE results taken in the soft state, with the X-ray flux dominated by the thermal accretion disk emission. We find that the polarization degree has dropped dramatically to less than or similar to 1%. This result indicates that the measured X-ray polarization is largely sensitive to the accretion state and the polarization fraction is significantly higher in the hard state when the X-ray emission is dominated by upscattered radiation in the X-ray corona. The combined polarization measurements in the soft and hard states disfavor a very high or low inclination of the system. Pracoviště Astronomický ústav Kontakt Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2025 Elektronická adresa https://hdl.handle.net/11104/0353686
Počet záznamů: 1