Determination of X-ray pulsar geometry with IXPE polarimetry

被引：47

作者：

Doroshenko, Victor ^{[1
]}

Poutanen, Juri ^{[2
,3
]}

Tsygankov, Sergey S. ^{[2
,3
]}

Suleimanov, Valery F. ^{[1
]}

Bachetti, Matteo ^{[4
]}

Caiazzo, Ilaria ^{[5
]}

Costa, Enrico ^{[6
]}

Di Marco, Alessandro ^{[6
]}

Heyl, Jeremy ^{[7
]}

La Monaca, Fabio ^{[6
]}

Muleri, Fabio ^{[6
]}

Mushtukov, Alexander A. ^{[8
,9
]}

Pavlov, George G. ^{[10
]}

Ramsey, Brian D. ^{[11
]}

Rankin, John ^{[6
]}

Santangelo, Andrea ^{[1
]}

Soffitta, Paolo ^{[6
]}

Staubert, Ruediger ^{[1
]}

Weisskopf, Martin C. ^{[11
]}

Zane, Silvia ^{[12
]}

Agudo, Ivan ^{[13
]}

Antonelli, Lucio A. ^{[14
,15
]}

Baldini, Luca ^{[16
,17
]}

Baumgartner, Wayne H. ^{[11
]}

Bellazzini, Ronaldo ^{[16
]}

Bianchi, Stefano ^{[18
]}

Bongiorno, Stephen D. ^{[11
]}

Bonino, Raffaella ^{[19
,20
]}

Brez, Alessandro ^{[16
]}

Bucciantini, Niccolo ^{[21
,22
,23
]}

Capitanio, Fiamma ^{[6
]}

Castellano, Simone ^{[16
]}

Cavazzuti, Elisabetta ^{[24
]}

Ciprini, Stefano ^{[15
,25
]}

De Rosa, Alessandra ^{[6
]}

Del Monte, Ettore ^{[6
]}

Di Gesu, Laura ^{[24
]}

Di Lalla, Niccolo ^{[26
,27
]}

Donnarumma, Immacolata ^{[24
]}

Dovciak, Michal ^{[28
]}

Ehlert, Steven R. ^{[11
]}

Enoto, Teruaki ^{[29
]}

Evangelista, Yuri ^{[6
]}

Fabiani, Sergio ^{[6
]}

Ferrazzoli, Riccardo ^{[6
]}

Garcia, Javier A. ^{[30
]}

Gunji, Shuichi ^{[31
]}

Hayashida, Kiyoshi ^{[32
]}

Iwakiri, Wataru ^{[33
]}

Jorstad, Svetlana G. ^{[34
,35
]}

机构：

[1] Univ Tubingen, Inst Astron & Astrophys, Tubingen, Germany

[2] Univ Turku, Dept Phys & Astron, Turku, Finland

[3] Russian Acad Sci, Space Res Inst, Moscow, Russia

[4] INAF Osservatorio Astron Cagliari, Selargius, CA, Italy

[5] Wafter Burke Inst Theoret Phys, TAPIR, Pasadena, CA USA

[6] INAF Ist Astrofis & Planetol Spaziali, Rome, Italy

[7] Univ British Columbia, Vancouver, BC, Canada

[8] Univ Oxford, Dept Phys, Astrophys, Oxford, England

[9] Leiden Univ, Leiden Observ, Leiden, Netherlands

[10] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA

[11] NASA Marshall Space Flight Ctr, Huntsville, AL USA

[12] Univ Coll London, Mullard Space Sci Lab, Dorking, Surrey, England

[13] Inst Astrofis Andalucia CSIC, Glorieta Astron S-N, Granada, Spain

[14] INAF Osservatorio Astron Roma, Monte Porzio Catone, RM, Italy

[15] Agenzia Spaziale Italiana, Space Sci Data Ctr, Rome, Italy

[16] Ist Nazl Fis Nucl, Sez Pisa, Pisa, Italy

[17] Univ Pisa, Dipartimento Fis, Pisa, Italy

[18] Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy

[19] Ist Nazl Fis Nucl, Sez Torino, Turin, Italy

[20] Univ Torino, Dipartimento Fis, Turin, Italy

[21] INAF Osservatorio Astrofis Arcetri, Florence, Italy

[22] Univ Firenze, Dipartimento Fis & Astron, Sesto Fiorentino, FI, Italy

[23] Ist Nazl Fis Nucl, Sez Firenze, Sesto Fiorentino, FI, Italy

[24] ASI Agenzia Spaziale Italiana, Rome, Italy

[25] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy

[26] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[27] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[28] Czech Acad Sci, Astron Inst, Prague 4, Czech Republic

[29] RIKEN Cluster Pioneering Res, Wako, Saitama, Japan

[30] CALTECH, Pasadena, CA USA

[31] Yamagata Univ, Yamagata, Japan

[32] Osaka Univ, Suita, Osaka, Japan

[33] Chuo Univ, Fac Sci & Engn, Dept Phys, Bunkyo Ku, Tokyo, Japan

[34] Boston Univ, Inst Astrophys Res, Boston, MA 02215 USA

[35] St Petersburg State Univ, Dept Astrophys, St Petersburg, Russia

[36] Washington Univ, Phys Dept, St Louis, MO USA

[37] Washington Univ, McDonnell Ctr Space Sci, St Louis, MO USA

[38] Univ Turku, Finnish Ctr Astron, ESO, Turku, Finland

[39] Univ Strasbourg, Observ Astron Strasbourg, CNRS, Strasbourg, France

[40] MIT, MIT Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[41] Nagoya Univ, Div Particle & Astrophys Sci, Grad Sch Sci, Chikusa Ku, Furo Cho, Nagoya, Aichi, Japan

[42] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima, Japan

[43] Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong, Peoples R China

[44] Harvard & Smithsonian, Ctr Astrophys, Cambridge, MA USA

[45] Max Planck Inst Astrophys, Garching, Germany

[46] INAF Osservatorio Astron Brera, Merate, LC, Italy

[47] Univ Padua, Dipartimento Fis & Astron, Padua, Italy

[48] Univ Roma Tor Vergata, Dipartimento Fis, Rome, Italy

[49] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[50] Univ Amsterdam, Anton Pannekoek Inst Astron, Amsterdam, Netherlands

来源：

NATURE ASTRONOMY | 2022年 / 6卷 / 12期

基金：

俄罗斯科学基金会; 芬兰科学院;

关键词：

FREE PRECESSION; POLARIZATION; EVOLUTION; X-1; HERCULES-X-1; BINARY; MODELS; MASS; PROFILES; PHASE;

D O I：

10.1038/s41550-022-01799-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using observations of X-ray pulsar Hercules X-1 by the Imaging X-ray Polarimetry Explorer we report a highly significant (>17 sigma) detection of the polarization signal from an accreting neutron star. The observed degree of linear polarization of similar to 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 similar to 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 / +

页数：13

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