Complex variations in X-ray polarization in the X-ray pulsar LS V+44 17/RX J0440.9+4431

被引：22

作者：

Doroshenko, Victor ^{[1
]}

Poutanen, Juri ^{[2
]}

Heyl, Jeremy ^{[3
]}

Tsygankov, Sergey S. ^{[2
]}

Caiazzo, Ilaria ^{[4
]}

Turolla, Roberto ^{[5
,6
]}

Veledina, Alexandra ^{[2
,7
,8
]}

Weisskopf, Martin C. ^{[9
]}

Forsblom, Sofia V. ^{[2
]}

Gonzalez-Caniulef, Denis ^{[10
]}

Loktev, Vladislav ^{[2
]}

Malacaria, Christian ^{[11
]}

Mushtukov, Alexander A. ^{[12
]}

Suleimanov, Valery F. ^{[1
]}

Lutovinov, Alexander A. ^{[13
]}

Mereminskiy, Ilya A. ^{[13
]}

Molkov, Sergey V. ^{[13
]}

Salganik, Alexander ^{[13
,14
]}

Santangelo, Andrea ^{[1
]}

Berdyugin, Andrei V. ^{[2
]}

Kravtsov, Vadim ^{[2
]}

Nitindala, Anagha P. ^{[2
]}

Agudo, Ivan ^{[15
]}

Antonelli, Lucio A. ^{[16
,17
]}

Bachetti, Matteo ^{[18
]}

Baldini, Luca ^{[19
,20
]}

Baumgartner, Wayne H. ^{[9
]}

Bellazzini, Ronaldo ^{[19
]}

Bianchi, Stefano ^{[21
]}

Bongiorno, Stephen D. ^{[9
]}

Bonino, Raffaella ^{[22
,23
]}

Brez, Alessandro ^{[19
]}

Bucciantini, Niccolo ^{[24
,25
,26
]}

Capitanio, Fiamma ^{[30
]}

Castellano, Simone ^{[19
]}

Cavazzuti, Elisabetta ^{[27
]}

Chen, Chien-Ting ^{[28
]}

Ciprini, Stefano ^{[17
,26
]}

Costa, Enrico ^{[30
]}

De Rosa, Alessandra ^{[30
]}

Del Monte, Ettore ^{[30
]}

Di Gesu, Laura ^{[27
]}

Di Lalla, Niccolo ^{[31
,32
]}

Di Marco, Alessandro ^{[30
]}

Donnarumma, Immacolata ^{[27
]}

Dovciak, Michal ^{[33
]}

Ehlert, Steven R. ^{[9
]}

Enoto, Teruaki ^{[34
]}

Evangelista, Yuri ^{[30
]}

Fabiani, Sergio ^{[30
]}

机构：

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

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

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

[4] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

[5] Univ Padua, Dipartimento Fis & Astron, Via Marzolo 8, I-35131 Padua, Italy

[6] Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England

[7] KTH Royal Inst Technol, NORDITA, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden

[8] Stockholm Univ, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden

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

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

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

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

[13] Russian Acad Sci, Space Res Inst IKI, Profsoyuznaya Str 84-32, Moscow 117997, Russia

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[33] Czech Acad Sci, Astron Inst, Bocni 2 1401-1, Prague 141004, Czech Republic

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

[35] CALTECH, Pasadena, CA 91125 USA

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

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

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

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

[40] Univ New Hampshire, Dept Phys & Astron, Durham, NH 03824 USA

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

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

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

[44] Univ Turku, Finnish Ctr Astron ESO, Turku 20014, Finland

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

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

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

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

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

[50] Univ Maryland, Baltimore, MD 21250 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2023年 / 677卷

基金：

芬兰科学院; 美国国家航空航天局; 加拿大自然科学与工程研究理事会;

关键词：

accretion; accretion disks; magnetic fields; pulsars: individual: RX J0440.9+4431; stars: neutron; X-rays: binaries; RX J0440.9+4431; BINARY; DISCOVERY; VARIABILITY;

D O I：

10.1051/0004-6361/202347088

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on Imaging X-ray polarimetry explorer (IXPE) observations of the Be-transient X-ray pulsar LS V +44 17/RX J0440.9+4431 made at two luminosity levels during the giant outburst in January-February 2023. Considering the observed spectral variability and changes in the pulse profiles, the source was likely caught in supercritical and subcritical states with significantly different emission-region geometry, associated with the presence of accretion columns and hot spots, respectively. We focus here on the pulse-phase-resolved polarimetric analysis and find that the observed dependencies of the polarization degree and polarization angle (PA) on the pulse phase are indeed drastically different for the two observations. The observed differences, if interpreted within the framework of the rotating vector model (RVM), imply dramatic variations in the spin axis inclination, the position angle, and the magnetic colatitude by tens of degrees within the space of just a few days. We suggest that the apparent changes in the observed PA phase dependence are predominantly related to the presence of an unpulsed polarized component in addition to the polarized radiation associated with the pulsar itself. We then show that the observed PA phase dependence in both observations can be explained with a single set of RVM parameters defining the pulsar's geometry. We also suggest that the additional polarized component is likely produced by scattering of the pulsar radiation in the equatorial disk wind.

引用

页数：10

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