X-Ray Polarized View of the Accretion Geometry in the X-Ray Binary Circinus X-1

被引：18

作者：

Rankin, John ^{[1
]}

La Monaca, Fabio ^{[1
,2
,3
]}

Di Marco, Alessandro ^{[1
]}

Poutanen, Juri ^{[4
]}

Bobrikova, Anna ^{[4
]}

Kravtsov, Vadim ^{[4
]}

Muleri, Fabio ^{[1
]}

Pilia, Maura ^{[5
]}

Veledina, Alexandra ^{[4
,6
,7
]}

Fender, Rob ^{[8
]}

Kaaret, Philip ^{[9
]}

Kim, Dawoon E. ^{[1
,2
,3
]}

Marinucci, Andrea ^{[10
]}

Marshall, Herman L. ^{[11
]}

Papitto, Alessandro ^{[12
]}

Tennant, Allyn F. ^{[9
]}

Tsygankov, Sergey S. ^{[4
]}

Weisskopf, Martin C. ^{[9
]}

Wu, Kinwah ^{[13
]}

Zane, Silvia ^{[13
]}

Ambrosino, Filippo ^{[12
]}

Farinelli, Ruben ^{[14
]}

Gnarini, Andrea ^{[15
]}

Agudo, Ivan ^{[16
]}

Antonelli, Lucio A. ^{[12
,17
]}

Bachetti, Matteo ^{[5
]}

Baldini, Luca ^{[18
,19
]}

Baumgartner, Wayne H. ^{[9
]}

Bellazzini, Ronaldo ^{[18
]}

Bianchi, Stefano ^{[15
]}

Bongiorno, Stephen D. ^{[9
]}

Bonino, Raffaella ^{[20
,21
]}

Brez, Alessandro ^{[18
]}

Bucciantini, Niccolo ^{[22
,23
,24
]}

Capitanio, Fiamma ^{[1
]}

Castellano, Simone ^{[18
]}

Cavazzuti, Elisabetta ^{[10
]}

Chen, Chien-Ting ^{[25
]}

Ciprini, Stefano ^{[17
,26
]}

Costa, Enrico ^{[1
]}

De Rosa, Alessandra ^{[1
]}

Del Monte, Ettore ^{[1
]}

Di Gesu, Laura ^{[10
]}

Di Lalla, Niccolo ^{[27
,28
]}

Donnarumma, Immacolata ^{[10
]}

Doroshenko, Victor ^{[29
]}

Dovciak, Michal ^{[30
]}

Ehlert, Steven R. ^{[9
]}

Enoto, Teruaki ^{[31
]}

Evangelista, Yuri ^{[1
]}

机构：

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

[2] Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy

[3] Univ Roma La Sapienza, Dipartimento Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy

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

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

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

[7] Stockholm Univ, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden

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

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

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

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

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

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

[14] INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via P Gobetti 101, I-40129 Bologna, Italy

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

[16] Inst Astrofis Andalucia CSIC, Glorieta Astron S-N, E-18008 Granada, Spain

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

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

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

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

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

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

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

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

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

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

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

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

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

[30] Czech Acad Sci, Astron Inst, Bocni II 1401-1, Prague 14100 4, Czech Republic

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

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

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

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

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

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

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

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

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

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

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

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

[43] Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy

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

[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] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

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

[49] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16801 USA

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

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2024年 / 961卷 / 01期

基金：

芬兰科学院; 国家重点研发计划; 中国国家自然科学基金;

关键词：

NEUTRON-STAR SURFACE; RELATIVISTIC OUTFLOW; MASS; POLARIMETRY; RADIATION; IXPE; GAS; JET; COMPTONIZATION; CONSTRAINTS;

D O I：

10.3847/2041-8213/ad1832

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cir X-1 is a neutron star X-ray binary characterized by strong variations in flux during its eccentric similar to 16.6 day orbit. There are also strong variations in the spectral state, and it has historically shown both atoll and Z state properties. We observed the source with the Imaging X-ray Polarimetry Explorer during two orbital segments, 6 days apart, for a total of 263 ks. We find an X-ray polarization degree in these segments of 1.6% +/- 0.3% and 1.4% +/- 0.3% at polarization angles of 37 degrees +/- 5 degrees and -12 degrees +/- 7 degrees, respectively. Thus, we observed a rotation of the polarization angle by 49 degrees +/- 8 degrees along the orbit. Because variations of accretion flow, and then of the hardness ratio, are expected during the orbit, we also studied the polarization binned in hardness ratio and found the polarization angle differing by 67 degrees +/- 11 degrees between the lowest and highest values of the hardness ratio. We discuss possible interpretations of this result that could indicate a possible misalignment between the symmetry axes of the accretion disk and the Comptonizing region caused by the misalignment of the neutron star's angular momentum with respect to the orbital one.

引用

页数：12

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