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Effects of Compton scattering on the neutron star radius constraints in rotation-powered millisecond pulsars
Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku 20014, Finland..
Univ Tubingen, Kepler Ctr Astro & Particle Phys, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany.;Kazan Volga Reg Fed Univ, Astron Dept, Kremlyovskaya Str 18, Kazan 420008, Russia.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 627, article id A39Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
EDP SCIENCES S A , 2019. Vol. 627, article id A39
Keywords [en]
stars: atmospheres, stars: neutron, X-rays: binaries, X-rays: stars
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-255438DOI: 10.1051/0004-6361/201935442ISI: 000473253700013Scopus ID: 2-s2.0-85068370643OAI: oai:DiVA.org:kth-255438DiVA, id: diva2:1344255
Note

QC 20190820

Available from: 2019-08-20 Created: 2019-08-20 Last updated: 2019-08-20Bibliographically approved

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Poutanen, Juri

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