IXPE Observations of the Quintessential Wind-accreting X-Ray Pulsar Vela X-1

被引：22

作者：

Forsblom, Sofia ^{[1
]}

Poutanen, Juri S. ^{[1
,2
]}

Tsygankov, Sergey ^{[1
,2
]}

Bachetti, Matteo ^{[3
]}

Marco, Alessandro Di ^{[4
]}

Doroshenko, Victor ^{[5
]}

Heyl, Jeremy ^{[6
]}

Monaca, Fabio La ^{[4
]}

Malacaria, Christian L. ^{[7
]}

Marshall, Herman ^{[8
,9
]}

Muleri, Fabio A. ^{[4
]}

Mushtukov, Alexander ^{[10
,11
]}

Pilia, Maura ^{[3
]}

Rogantini, Daniele F. ^{[8
,9
]}

Suleimanov, Valery ^{[5
]}

Taverna, Roberto ^{[12
]}

Xie, Fei ^{[4
,13
]}

Agudo, Ivan A. ^{[14
]}

Antonelli, Lucio ^{[15
,16
]}

Baldini, Luca H. ^{[17
,18
]}

Baumgartner, Wayne

Bellazzini, Ronaldo

Bianchi, Stefano D. ^{[16
,19
]}

Bongiorno, Stephen

Bonino, Raffaella ^{[20
]}

Brez, Alessandro

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

Capitanio, Fiamma ^{[4
]}

Castellano, Simone

Cavazzuti, Elisabetta ^{[24
]}

Chen, Chien-Ting ^{[25
]}

Ciprini, Stefano

Costa, Enrico ^{[4
]}

De Rosa, Alessandra ^{[4
]}

Del Monte, Ettore ^{[4
]}

Di Gesu, Laura ^{[24
]}

Di Lalla, Niccolo ^{[26
]}

Donnarumma, Immacolata ^{[24
]}

Dovciak, Michal R. ^{[27
]}

Ehlert, Steven

Enoto, Teruaki ^{[28
]}

Evangelista, Yuri ^{[4
]}

Fabiani, Sergio ^{[4
]}

Ferrazzoli, Riccardo A. ^{[4
]}

Garcia, Javier ^{[29
]}

Gunji, Shuichi ^{[30
]}

Hayashida, Kiyoshi ^{[31
]}

Iwakiri, Wataru G. ^{[32
]}

Jorstad, Svetlana ^{[33
,34
]}

Kaaret, Philip ^{[35
]}

机构：

[1] Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland

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

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

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

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

[6] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

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

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

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

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

[11] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

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

[13] Guangxi Univ, Sch Phys Sci & Technol, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China

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

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

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

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

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

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

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

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

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

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

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

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

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

[27] Czech Acad Sci, Astron Inst, Bocni 21401-1, Prague 4, Czech Republic

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

[29] CALTECH, Pasadena, CA 91125 USA

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

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

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

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

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

[35] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

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

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

[38] Univ Turku, Finnish Ctr Astron, ESO, FI-20014 Turku, Finland

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

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

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

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

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

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

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

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

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

[48] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[49] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85741 Garching, Germany

[50] INAF Osservatorio Astron Brera, Via E Bianchi 46, I-23807 Merate, LC, Italy

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2023年 / 947卷 / 02期

基金：

芬兰科学院; 美国国家航空航天局;

关键词：

CYCLOTRON LINE ENERGY; INTERVAL ESTIMATION; POLARIZATION; DISCOVERY; EMISSION; SPECTRA; ASTROPY; POINT; MASS;

D O I：

10.3847/2041-8213/acc391

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The radiation from accreting X-ray pulsars was expected to be highly polarized, with some estimates for the polarization degree of up to 80%. However, phase-resolved and energy-resolved polarimetry of X-ray pulsars is required in order to test different models and to shed light on the emission processes and the geometry of the emission region. Here we present the first results of the observations of the accreting X-ray pulsar Vela X-1 performed with the Imaging X-ray Polarimetry Explorer. Vela X-1 is considered to be the archetypal example of a wind-accreting, high-mass X-ray binary system, consisting of a highly magnetized neutron star accreting matter from its supergiant stellar companion. The spectropolarimetric analysis of the phase-averaged data for Vela X-1 reveals a polarization degree (PD) of 2.3% +/- 0.4% at the polarization angle (PA) of -47.degrees 3 +/- 5.degrees 4. A low PD is consistent with the results obtained for other X-ray pulsars and is likely related to the inverse temperature structure of the neutron star atmosphere. The energy-resolved analysis shows the PD above 5 keV reaching 6%-10% and a similar to 90 degrees difference in the PA compared to the data in the 2-3 keV range. The phase-resolved spectropolarimetric analysis finds a PD in the range 0%-9% with the PA varying between -80 degrees and 40 degrees.

引用

页数：10

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