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Oblate Schwarzschild approximation for polarized radiation from rapidly rotating neutron stars
Tekijät: Vladislav Loktev, Tuomo Salmi, Joonas Nättilä, Juri Poutanen
Kustantaja: EDP SCIENCES S A
Julkaisuvuosi: 2020
Journal: Astronomy and Astrophysics
Tietokannassa oleva lehden nimi: ASTRONOMY & ASTROPHYSICS
Lehden akronyymi: ASTRON ASTROPHYS
Artikkelin numero: ARTN A84
Vuosikerta: 643
Sivujen määrä: 11
ISSN: 0004-6361
eISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/202039134
Verkko-osoite: https://www.aanda.org/articles/aa/abs/2020/11/aa39134-20/aa39134-20.html
Rinnakkaistallenteen osoite: https://arxiv.org/abs/2009.08852
We have developed a complete theory for the calculation of the observed Stokes parameters for radiation emitted from the surface of a rapidly rotating neutron star (NS) using the oblate Schwarzschild approximation. We accounted for the rotation of the polarization plane due to relativistic effects along the path from the stellar surface to the observer. The results were shown to agree with those obtained by performing full numerical general relativistic ray-tracing with the ARCMANCER code. We showed that the obtained polarization angle profiles may differ substantially from those derived for a spherical star. We demonstrated that assuming incorrect shape for the star can lead to biased constraints for NS parameters when fitting the polarization data. Using a simplified model, we also made a rough estimate of how accurately the geometrical parameters of an accreting NS can be determined using the X-ray polarization measurements of upcoming polarimeters like the Imaging X-ray Polarimeter Explorer or the enhanced X-ray Timing and Polarimetry mission.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
