Determination of X-ray pulsar geometry with IXPE polarimetry

被引：0

作者：

Victor Doroshenko

Juri Poutanen

Sergey S. Tsygankov

Valery F. Suleimanov

Matteo Bachetti

Ilaria Caiazzo

Enrico Costa

Alessandro Di Marco

Jeremy Heyl

Fabio La Monaca

Fabio Muleri

Alexander A. Mushtukov

George G. Pavlov

Brian D. Ramsey

John Rankin

Andrea Santangelo

Paolo Soffitta

Rüdiger Staubert

Martin C. Weisskopf

Silvia Zane

Iván Agudo

Lucio A. Antonelli

Luca Baldini

Wayne H. Baumgartner

Ronaldo Bellazzini

Stefano Bianchi

Stephen D. Bongiorno

Raffaella Bonino

Alessandro Brez

Niccolò Bucciantini

Fiamma Capitanio

Simone Castellano

Elisabetta Cavazzuti

Stefano Ciprini

Alessandra De Rosa

Ettore Del Monte

Laura Di Gesu

Niccolò Di Lalla

Immacolata Donnarumma

Michal Dovčiak

Steven R. Ehlert

Teruaki Enoto

Yuri Evangelista

Sergio Fabiani

Riccardo Ferrazzoli

Javier A. Garcia

Shuichi Gunji

Kiyoshi Hayashida

Wataru Iwakiri

Svetlana G. Jorstad

机构：

[1] Universität Tübingen,Institut für Astronomie und Astrophysik

[2] University of Turku,Department of Physics and Astronomy

[3] Space Research Institute of the Russian Academy of Sciences,TAPIR

[4] INAF Osservatorio Astronomico di Cagliari,Astrophysics, Department of Physics

[5] Walter Burke Institute for Theoretical Physics,Leiden Observatory

[6] INAF Istituto di Astrofisica e Planetologia Spaziali,Department of Astronomy and Astrophysics

[7] University of British Columbia,Mullard Space Science Laboratory

[8] University of Oxford,Instituto de Astrofísica de Andalucía

[9] Leiden University,CSIC

[10] Pennsylvania State University,Space Science Data Center

[11] NASA Marshall Space Flight Center,Dipartimento di Fisica

[12] University College London,Dipartimento di Matematica e Fisica

[13] Glorieta de la Astronomía s/n,Dipartimento di Fisica

[14] INAF Osservatorio Astronomico di Roma,Dipartimento di Fisica e Astronomia

[15] Agenzia Spaziale Italiana,Department of Physics and Kavli Institute for Particle Astrophysics and Cosmology

[16] Istituto Nazionale di Fisica Nucleare,Department of Physics, Faculty of Science and Engineering

[17] Sezione di Pisa,Institute for Astrophysical Research

[18] Università di Pisa,Department of Astrophysics

[19] Università degli Studi Roma Tre,Physics Department and McDonnell Center for the Space Sciences

[20] Istituto Nazionale di Fisica Nucleare,Finnish Centre for Astronomy with ESO

[21] Sezione di Torino,Graduate School of Science, Division of Particle and Astrophysical Science

[22] Università degli Studi di Torino,Hiroshima Astrophysical Science Center

[23] INAF Osservatorio Astrofisico di Arcetri,Department of Physics

[24] Università degli Studi di Firenze,Center for Astrophysics

[25] Istituto Nazionale di Fisica Nucleare,Dipartimento di Fisica e Astronomia

[26] Sezione di Firenze,Dipartimento di Fisica

[27] ASI -Agenzia Spaziale Italiana,Department of Astronomy

[28] Istituto Nazionale di Fisica Nucleare,Anton Pannekoek Institute for Astronomy & GRAPPA

[29] Sezione di Roma Tor Vergata,Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology

[30] Stanford University,undefined

[31] Astronomical Institute of the Czech Academy of Sciences,undefined

[32] RIKEN Cluster for Pioneering Research,undefined

[33] California Institute of Technology,undefined

[34] Yamagata University,undefined

[35] Osaka University,undefined

[36] Chuo University,undefined

[37] Boston University,undefined

[38] St. Petersburg State University,undefined

[39] Washington University in St. Louis,undefined

[40] University of Turku,undefined

[41] Université de Strasbourg,undefined

[42] CNRS,undefined

[43] Observatoire Astronomique de Strasbourg,undefined

[44] MIT Kavli Institute for Astrophysics and Space Research,undefined

[45] Massachusetts Institute of Technology,undefined

[46] Nagoya University,undefined

[47] Furo-cho,undefined

[48] Chikusa-ku,undefined

[49] Hiroshima University,undefined

[50] The University of Hong Kong,undefined

来源：

Nature Astronomy | 2022年 / 6卷

关键词：

D O I：

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中图分类号：

学科分类号：

摘要：

Using observations of X-ray pulsar Hercules X-1 by the Imaging X-ray Polarimetry Explorer we report a highly significant (>17σ) detection of the polarization signal from an accreting neutron star. The observed degree of linear polarization of ~10% is far below theoretical expectations for this object, and stays low throughout the spin cycle of the pulsar. Both the degree and angle of polarization exhibit variability with the pulse phase, allowing us to measure the pulsar spin position angle 57(2) deg and the magnetic obliquity 12(4) deg, which is an essential step towards detailed modelling of the intrinsic emission of X-ray pulsars. Combining our results with the optical polarimetric data, we find that the spin axis of the neutron star and the angular momentum of the binary orbit are misaligned by at least ~20 deg, which is a strong argument in support of the models explaining the stability of the observed superorbital variability with the precession of the neutron star.

引用

页码：1433 / 1443

页数：10

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