X-ray polarimetry of the accreting pulsar GX 301-2

被引：19

作者：

Suleimanov, Valery F. ^{[1
]}

Forsblom, Sofia V. ^{[2
]}

Tsygankov, Sergey S. ^{[2
]}

Poutanen, Juri ^{[2
]}

Doroshenko, Victor ^{[1
]}

Doroshenko, Rosalia ^{[1
]}

Capitanio, Fiamma ^{[3
]}

Di Marco, Alessandro ^{[3
]}

Gonzalez-Caniulef, Denis ^{[4
]}

Heyl, Jeremy ^{[5
]}

La Monaca, Fabio ^{[3
]}

Lutovinov, Alexander A. ^{[6
]}

Molkov, Sergey V. ^{[6
]}

Malacaria, Christian ^{[7
]}

Mushtukov, Alexander A. ^{[8
]}

Shtykovsky, Andrey E. ^{[6
,9
]}

Agudo, Ivan ^{[10
]}

Antonelli, Lucio A. ^{[11
,12
]}

Bachetti, Matteo ^{[13
]}

Baldini, Luca ^{[14
,15
]}

Baumgartner, Wayne H. ^{[16
]}

Bellazzini, Ronaldo ^{[14
]}

Bianchi, Stefano ^{[17
]}

Bongiorno, Stephen D. ^{[16
]}

Bonino, Raffaella ^{[18
,19
]}

Brez, Alessandro ^{[14
]}

Bucciantini, Niccolo ^{[20
,21
,22
]}

Castellano, Simone ^{[14
]}

Cavazzuti, Elisabetta ^{[23
]}

Chen, Chien-Ting ^{[24
]}

Ciprini, Stefano ^{[12
,25
]}

Costa, Enrico ^{[3
]}

De Rosa, Alessandra ^{[3
]}

Del Monte, Ettore ^{[3
]}

Di Gesu, Laura ^{[23
]}

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

Donnarumma, Immacolata ^{[23
]}

Dovciak, Michal ^{[29
]}

Ehlert, Steven R. ^{[16
]}

Enoto, Teruaki ^{[30
]}

Evangelista, Yuri ^{[3
]}

Fabiani, Sergio ^{[3
]}

Ferrazzoli, Riccardo ^{[3
]}

Garcia, Javier A. ^{[31
]}

Gunji, Shuichi ^{[32
]}

Hayashida, Kiyoshi ^{[33
]}

Iwakiri, Wataru ^{[34
]}

Jorstad, Svetlana G. ^{[35
,36
]}

Kaaret, Philip ^{[16
]}

Karas, Vladimir ^{[29
]}

机构：

[1] Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany

[2] Univ Turku, Dept Phys & Astron, Turku 20014, Finland

[3] INAF Ist Astrofis & Planetol Spaziali, Via Fosso Cavaliere 100, I-00133 Rome, Italy

[4] UPS OMP, Inst Rech Astrophys & Planetol, CNRS, CNES, 9 Ave Colonel Roche,BP 44346, F-31028 Toulouse 4, France

[5] Univ British Columbia, Vancouver, BC V6T 1Z4, Canada

[6] Russian Acad Sci, Space Res Inst IKI, Prosoyuznaya Ul 84-32, Moscow 117997, Russia

[7] Int Space Sci Inst, Hallerstr 6, CH-3012 Bern, Switzerland

[8] Univ Oxford, Dept Phys, Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[9] Natl Res Univ Higher Sch Econ, Fac Phys, Myasnitskaya Ul 20, Moscow 101000, Russia

[10] CSIC, Inst Astrofisicade Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain

[11] INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone RM, RM, Italy

[12] Agenzia Spaziale Italiana, Space Sci Data Ctr, Via Politecn Snc, I-00133 Rome, Italy

[13] INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy

[14] Ist Nazl Fis Nucl, Sez Pisa, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[15] Univ Pisa, Dipartimento Fis, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[16] NASA, Marshall Space Flight Ctr, Huntsville, AL 35812 USA

[17] Univ Roma Tre, Dipartimento Matemat & Fis, Via Vasca Navale 84, I-00146 Rome, Italy

[18] Ist Nazl Fis Nucl, Sez Torino, Via Pietro Giuria 1, I-10125 Turin, Italy

[19] Univ Torino, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy

[20] INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy

[21] Univ Firenze, Dipartimento Fis & Astron, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy

[22] Ist Nazl Fis Nucl, Sez Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy

[23] Agenzia Spaziale Italiana, Via Politecn Snc, I-00133 Rome, Italy

[24] Univ Space Res Assoc, Inst Sci & Technol, Huntsville, AL 35805 USA

[25] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Via Ric Sci 1, I-00133 Rome, Italy

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

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

[28] Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France

[29] Czech Acad Sci, Astron Inst, Bocnn 2 1401-1, Prague 14100 4, Czech Republic

[30] RIKEN Cluster Pioneering Res, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[31] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[32] Yamagata Univ, 1-4-12 Kojirakawa Machi, Yamagata 9908560, Japan

[33] Osaka Univ, 1-1 Yamadaoka, Suita, Osaka 5650871, Japan

[34] Chiba Univ, Int Ctr Hadron Astrophys, Chiba 2638522, Japan

[35] Boston Univ, Inst Astrophys Res, 725 Commonwealth Ave, Boston, MA 02215 USA

[36] St Petersburg State Univ, Dept Astrophys, Univ Pr 28, St Petersburg 198504, Russia

[37] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA

[38] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA

[39] Washington Univ St Louis, Dept Phys, St Louis, MO 63130 USA

[40] Washington Univ St Louis, McDonnell Ctr Space Sci, St Louis, MO 63130 USA

[41] Finnish Ctr Astron ESO, Turku 20014, Finland

[42] Ist Nazl Fis Nucl, Sez Napoli, Str Comunale Cinthia, I-80126 Naples, Italy

[43] Univ Strasbourg, CNRS, Observ Astron Strasbourg, UMR 7550, F-67000 Strasbourg, France

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

[45] Nagoya Univ, Grad Sch Sci, Div Particle & Astrophys Sci, Furo Cho,Chikusa Ku, Nagoya, Aichi 4648602, Japan

[46] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 7398526, Japan

[47] Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA

[48] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[49] NASA, Ctr Res & Explorat Space Sci & Technol, GSFC, Greenbelt, MD 20771 USA

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

来源：

ASTRONOMY & ASTROPHYSICS | 2023年 / 678卷

基金：

俄罗斯科学基金会; 美国国家航空航天局; 芬兰科学院; 加拿大自然科学与工程研究理事会;

关键词：

magnetic fields; methods: observational; polarization; stars: neutron; X-rays: binaries; X-rays: individuals: GX 301-2; POLARIZATION; LUMINOSITY; STARS;

D O I：

10.1051/0004-6361/202346994

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The phase- and energy-resolved polarization measurements of accreting X-ray pulsars (XRPs) allow us to test different theoretical models of their emission, and they also provide an avenue to determine the emission region geometry. We present the results of the observations of the XRP GX 301-2 performed with the Imaging X-ray Polarimetry Explorer (IXPE). A persistent XRP, GX 301-2 has one of the longest spin periods known: similar to 680 s. A massive hyper-giant companion star Wray 977 supplies mass to the neutron star via powerful stellar winds. We did not detect significant polarization in the phase-averaged data when using spectro-polarimetric analysis, with the upper limit on the polarization degree (PD) of 2.3% (99% confidence level). Using the phase-resolved spectro-polarimetric analysis, we obtained a significant detection of polarization (above 99% confidence level) in two out of nine phase bins and a marginal detection in three bins, with a PD ranging between similar to 3% and similar to 10% and a polarization angle varying in a very wide range from similar to 0 degrees to similar to 160 degrees. Using the rotating vector model, we obtained constraints on the pulsar geometry using both phase-binned and unbinned analyses, finding excellent agreement. Finally, we discuss possible reasons for a low observed polarization in GX 301-2.

引用

页数：10

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