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Effects of Compton scattering on the neutron star radius constraints in rotation-powered millisecond pulsars
Tekijät: Salmi T, Suleimanov VF, Poutanen J
Kustantaja: EDP SCIENCES S A
Julkaisuvuosi: 2019
Journal: Astronomy and Astrophysics
Tietokannassa oleva lehden nimi: ASTRONOMY & ASTROPHYSICS
Lehden akronyymi: ASTRON ASTROPHYS
Artikkelin numero: ARTN A39
Vuosikerta: 627
Sivujen määrä: 6
ISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/201935442
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/41209693
The aim of this work is to study the possible effects and biases on the radius constraints for rotation-powered millisecond pulsars when using Thomson approximation to describe electron scattering in the atmosphere models, instead of using exact formulation for Compton scattering. We compare the differences between the two models in the energy spectrum and angular distribution of the emitted radiation. We also analyse a self-generated, synthetic, phase-resolved energy spectrum, based on Compton atmosphere and the most X-ray luminous, rotation-powered millisecond pulsars observed by the Neutron star Interior Composition ExploreR (NICER). We derive constraints for the neutron star parameters using both the Compton and Thomson models. The results show that the method works by reproducing the correct parameters with the Compton model. However, biases are found in both the size and the temperature of the emitting hotspot, when using the Thomson model. The constraints on the radius are still not significantly changed, and therefore the Thomson model seems to be adequate if we are interested only in the radius measurements using NICER.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
