IXPE Observations of the Quintessential Wind-accreting X-Ray Pulsar Vela X-1
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00572125" target="_blank" >RIV/67985815:_____/23:00572125 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0342978" target="_blank" >https://hdl.handle.net/11104/0342978</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/2041-8213/acc391" target="_blank" >10.3847/2041-8213/acc391</a>
Alternative languages
Result language
angličtina
Original language name
IXPE Observations of the Quintessential Wind-accreting X-Ray Pulsar Vela X-1
Original language description
The radiation from accreting X-ray pulsars was expected to be highly polarized, with some estimates for the polarization degree of up to 80%. However, phase-resolved and energy-resolved polarimetry of X-ray pulsars is required in order to test different models and to shed light on the emission processes and the geometry of the emission region. Here we present the first results of the observations of the accreting X-ray pulsar Vela X-1 performed with the Imaging X-ray Polarimetry Explorer. Vela X-1 is considered to be the archetypal example of a wind-accreting, high-mass X-ray binary system, consisting of a highly magnetized neutron star accreting matter from its supergiant stellar companion. The spectropolarimetric analysis of the phase-averaged data for Vela X-1 reveals a polarization degree (PD) of 2.3% +/- 0.4% at the polarization angle (PA) of47.degrees 3 +/- 5.degrees 4. A low PD is consistent with the results obtained for other X-ray pulsars and is likely related to the inverse temperature structure of the neutron star atmosphere. The energy-resolved analysis shows the PD above 5 keV reaching 6%-10% and a similar to 90 degrees difference in the PA compared to the data in the 2-3 keV range. The phase-resolved spectropolarimetric analysis finds a PD in the range 0%-9% with the PA varying between80 degrees and 40 degrees.
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
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal Letters
ISSN
2041-8205
e-ISSN
2041-8213
Volume of the periodical
947
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
L20
UT code for WoS article
000976739200001
EID of the result in the Scopus database
2-s2.0-85158131320