NuSTAR detection of a cyclotron line in the supergiant fast X-ray transient IGR J17544-2619

被引：38

作者：

Bhalerao, Varun ^{[1
]}

Romano, Patrizia ^{[2
]}

Tomsick, John ^{[3
]}

Natalucci, Lorenzo ^{[4
]}

Smith, David M. ^{[5
,6
]}

Bellm, Eric ^{[7
]}

Boggs, Steven E. ^{[3
]}

Chakrabarty, Deepto ^{[8
]}

Christensen, Finn E. ^{[9
]}

Craig, William W. ^{[3
,10
]}

Fuerst, Felix ^{[7
]}

Hailey, Charles J. ^{[11
]}

Harrison, Fiona A. ^{[7
]}

Krivonos, Roman A. ^{[3
]}

Lu, Ting-Ni ^{[7
,12
]}

Madsen, Kristin ^{[7
]}

Stern, Daniel ^{[13
]}

Younes, George ^{[14
]}

Zhang, William ^{[15
]}

机构：

[1] Inter Univ Ctr Astron & Astrophys, Pune 411007, Maharashtra, India

[2] Ist Astrofis Spaziale & Fis Cosm, INAF, I-90146 Palermo, Italy

[3] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[4] INAF IAPS, Ist Nazl Astrofis, I-00133 Rome, Italy

[5] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

[6] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

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

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

[9] Tech Univ Denmark, Natl Space Inst, DTU Space, DK-2800 Lyngby, Denmark

[10] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[11] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

[12] Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan

[13] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[14] NSSTC, USRA, Huntsville, AL 35801 USA

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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 447卷 / 03期

基金：

美国国家航空航天局;

关键词：

X-rays: binaries; X-rays: individual: IGR J17544-2619; XTE J1739-302; INTEGRAL OBSERVATIONS; SWIFT OBSERVATIONS; NEUTRON-STAR; OUTBURST; ABSORPTION; BINARIES; WINDS;

D O I：

10.1093/mnras/stu2495

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present NuSTAR spectral and timing studies of the supergiant fast X-ray transient (SFXT) IGR J17544-2619. The spectrum is well described by an similar to 1 keV blackbody and a hard continuum component, as expected from an accreting X-ray pulsar. We detect a cyclotron line at 17 keV, confirming that the compact object in IGR J17544-2619 is indeed a neutron star. This is the first measurement of the magnetic field in an SFXT. The inferred magnetic field strength, B = (1.45 +/- 0.03) x 10(12) G (1 + z) is typical of neutron stars in X-ray binaries, and rules out a magnetar nature for the compact object. We do not find any significant pulsations in the source on time-scales of 1-2000 s.

引用

页码：2274 / 2281

页数：8

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