NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar

被引：27

作者：

Sanna, A. ^{[1
]}

Ferrigno, C. ^{[2
]}

Ray, P. S. ^{[3
]}

Ducci, L. ^{[4
]}

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

Enoto, T. ^{[6
,7
]}

Bozzo, E. ^{[2
]}

Altamirano, D. ^{[8
]}

Di Salvo, T. ^{[9
]}

Strohmayer, T. E. ^{[10
]}

Papitto, A. ^{[11
]}

Riggio, A. ^{[1
]}

Burderi, L. ^{[1
]}

Bult, P. M. ^{[10
]}

Bogdanov, S. ^{[12
]}

Gambino, A. F. ^{[9
]}

Marino, A. ^{[9
,13
,14
]}

Iaria, R. ^{[9
]}

Arzoumanian, Z. ^{[10
]}

Chakrabarty, D. ^{[15
]}

Gendreau, K. C. ^{[10
]}

Guillot, S. ^{[16
,17
]}

Markwardt, C. ^{[10
]}

Wolff, M. T. ^{[3
]}

机构：

[1] Univ Cagliari, Dipartimento Fis, SP Monserrato Sestu Km 0-7, I-09042 Monserrato, Italy

[2] Univ Geneva, Dept Astron, ISDC, Chemin Ecogia 16, CH-1290 Versoix, Switzerland

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

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

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

[6] Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto, Kyoto 6068502, Japan

[7] Kyoto Univ, Hakubi Ctr Adv Res, Sakyo Ku, Yoshida Ushinomiya Cho, Kyoto 6068302, Japan

[8] Univ Southampton, Phys & Astron, Southampton SO17 1BJ, Hants, England

[9] Univ Palermo, Dipartimento Fis & Chim, Via Archirafi 36, I-90123 Palermo, Italy

[10] NASA, Astrophys Sci Div, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[11] Osserv Astron Roma, INAF, Via Frascati 33, I-00044 Rome, Italy

[12] Columbia Univ, Columbia Astrophys Lab, 550 West 120th St, New York, NY 10027 USA

[13] IASF Palermo, INAF, Via Ugo La Malfa 153, I-90146 Palermo, Italy

[14] Univ Toulouse, IRAP, CNRS, UPS,CNES, Toulouse, France

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

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

[17] Univ Toulouse, CNES, UPS, OMP, F-31028 Toulouse, France

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 617卷

关键词：

accretion; accretion disks; stars: low-mass; pulsars: general; stars: neutron; X-rays: binaries; 2015; OUTBURST; TIMING PROPERTIES; SAX J1808.4-3658; AQUILA X-1; XMM-NEWTON; J1748.9-2021; PULSATIONS; DISCOVERY; STARS; MASS;

D O I：

10.1051/0004-6361/201834160

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of similar to 8.8 h and a projected semi-major axis of similar to 1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42 M-circle dot, obtained assuming a neutron star mass of 1.4 M-circle dot and an inclination angle lower than 60 degrees, as suggested by the absence of eclipses or dips in the light curve of the source. The broadband energy spectrum, obtained by combining NuSTAR, Swift, and INTEGRAL observations, is dominated by Comptonisation of soft thermal seed photons with a temperature of similar to 0.7 keV by electrons heated to 21 keV. We also detect black-body-like thermal direct emission that is compatible with an emission region of a few kilometers and a temperature compatible with the seed source of Comptonisation. A weak Gaussian line centred on the iron K alpha complex can be interpreted as a signature of disc reflection. A similar spectrum characterises the NICER spectra, which was measured when the outburst faded.

引用

页数：5

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