The 2019 super-Eddington outburst of RXJ0209.6-7427: detection of pulsations and constraints on the magnetic field strength

被引：48

作者：

Vasilopoulos, G. ^{[1
]}

Ray, P. S. ^{[2
]}

Gendreau, K. C. ^{[3
]}

Jenke, P. A. ^{[4
]}

Jaisawal, G. K. ^{[5
]}

Wilson-Hodge, C. A. ^{[6
]}

Strohmayer, T. E. ^{[7
,8
]}

Altamirano, D. ^{[9
]}

Iwakiri, W. B. ^{[10
]}

Wolff, M. T. ^{[2
]}

Guillot, S. ^{[11
]}

Malacaria, C. ^{[6
,12
]}

Stevens, A. L. ^{[13
,14
]}

机构：

[1] Yale Univ, Dept Astron, POB 208101, New Haven, CT 06520 USA

[2] US Naval Res Lab, Space Sci Div, Washington, DC 20375 USA

[3] NASA, Goddard Space Flight Ctr, XRay Astrophys Lab, Greenbelt, MD 20771 USA

[4] Univ Alabama, Huntsville, AL 35805 USA

[5] Tech Univ Denmark, Natl Space Inst, Elektrovej 327-328, DK-2800 Lyngby, Denmark

[6] NASA, Marshall Space Flight Ctr, Astrophys Branch, Huntsville, AL 35812 USA

[7] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Code 916, Greenbelt, MD 20771 USA

[8] NASA, Goddard Space Flight Ctr, Joint Space Sci Inst, Code 916, Greenbelt, MD 20771 USA

[9] Univ Southampton, Sch Phys & Astron, Univ Rd, Southampton SO17 1BJ, Hants, England

[10] Chuo Univ, Fac Sci & Engn, Dept Phys, Bunkyo Ku, 1-13-27 Kasuga, Tokyo 1128551, Japan

[11] CNRS, IRAP, 9 Ave Colonel Roche,BP 44346, F-31028 Toulouse 4, France

[12] Univ Space Res Assoc, NSSTC, 320 Sparkman Dr, Huntsville, AL 35805 USA

[13] Michigan State Univ, Dept Phys & Astron, 567 Wilson Rd, E Lansing, MI 48824 USA

[14] Univ Michigan, Dept Astron, 1085 South Univ Ave, Ann Arbor, MI 48109 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 494卷 / 04期

关键词：

stars: neutron; pulsars: individual: RX J0209.6-7427; galaxies: individual: SMC; X-rays: binaries; X-RAY SOURCE; SMALL-MAGELLANIC-CLOUD; NGC; 300; ULX1; ACCRETING PULSAR; NEUTRON-STARS; BINARY PULSAR; COHERENT PULSATIONS; DISCOVERY; IDENTIFICATION; LUMINOSITY;

D O I：

10.1093/mnras/staa991

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In 2019 November, MAXI detected an X-ray outburst from the known Be X-ray binary system RXJ0209.6-7427 located in the outer wing of the Small Magellanic Cloud. We followed the outburst of the system with NICER, which led to the discovery of X-ray pulsations with a period of 9.3 s. We analysed simultaneous X-ray data obtained with NuSTAR and NICER, allowing us to characterize the spectrum and provide an accurate estimate of its bolometric luminosity. During the outburst, the maximum broad-band X-ray luminosity of the system reached (1-2) x 10(39) erg s(-1), thus exceeding by about one order of magnitude the Eddington limit for a typical 1.4 M-circle dot mass neutron star (NS). Monitoring observations with Fermi/GBM and NICER allowed us to study the spin evolution of the NS and compare it with standard accretion torque models. We found that theNSmagnetic field should be of the order of 3x10(12) G. We conclude that RXJ0209.6-7427 exhibited one of the brightest outbursts observed from a Be X-ray binary pulsar in the Magellanic Clouds, reaching similar luminosity level to the 2016 outburst of SMCX-3. Despite the super-Eddington luminosity of RXJ0209.6-7427, the NS appears to have only a moderate magnetic field strength.

引用

页码：5350 / 5359

页数：10

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