IXPE observation confirms a high spin in the accreting black hole 4U 1957+115
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00586061" target="_blank" >RIV/67985815:_____/24:00586061 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/24:10494059
Result on the web
<a href="https://hdl.handle.net/11104/0354009" target="_blank" >https://hdl.handle.net/11104/0354009</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202348277" target="_blank" >10.1051/0004-6361/202348277</a>
Alternative languages
Result language
angličtina
Original language name
IXPE observation confirms a high spin in the accreting black hole 4U 1957+115
Original language description
We present the results of the first X-ray polarimetric observation of the low-mass X-ray binary 4U 1957+115, performed with the Imaging X-ray Polarimetry Explorer in May 2023. The binary system has been in a high-soft spectral state since its discovery and is thought to host a black hole. The similar to 571 ks observation reveals a linear polarisation degree of 1.9% +/- 0.6% and a polarisation angle of41.(degrees)8 +/- 7.(degrees)9 in the 2-8 keV energy range. Spectral modelling is consistent with the dominant contribution coming from the standard accretion disc, while polarimetric data suggest a significant role of returning radiation: photons that are bent by strong gravity effects and forced to return to the disc surface, where they can be reflected before eventually reaching the observer. In this setting, we find that models with a black hole spin lower than 0.96 and an inclination lower than 50(degrees) are disfavoured.
Czech name
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Czech description
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Classification
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)
Result continuities
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
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
684
Issue of the periodical within the volume
April
Country of publishing house
FR - FRANCE
Number of pages
12
Pages from-to
A95
UT code for WoS article
001202252600001
EID of the result in the Scopus database
2-s2.0-85190657282