Spectral and timing properties of the accreting millisecond X-ray pulsar IGR J17498-2921 during its 2023 outburst

被引：1

作者：

Illiano, G. ^{[1
,2
,3
]}

Papitto, A. ^{[1
]}

Marino, A. ^{[4
,5
]}

Strohmayer, T. E. ^{[6
,7
]}

Sanna, A. ^{[8
]}

Di Salvo, T. ^{[9
]}

La Placa, R. ^{[1
]}

Ambrosino, F. ^{[1
]}

Zanon, A. Miraval ^{[10
]}

Zelati, F. Coti ^{[4
,5
,11
]}

Ballocco, C. ^{[1
,3
]}

Malacaria, C. ^{[1
]}

Ghedina, A. ^{[12
]}

Cecconi, M. ^{[12
]}

Gonzales, M. ^{[12
]}

Leone, F. ^{[13
,14
]}

机构：

[1] INAF Osservatorio Astron Roma, Via Frascati 33, I-00076 Monte Porzio Catone, RM, Italy

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

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

[4] CSIC, Inst Space Sci ICE, Campus UAB,Carrer Can Magrans S-N, E-08193 Barcelona, Spain

[5] Inst Estudis Espacials Catalunya IEEC, E-08860 Castelldefels, Barcelona, Spain

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

[7] NASA Goddard Space Flight Ctr, Joint Space Sci Inst, Greenbelt, MD 20771 USA

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

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

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

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

[12] Fdn Galileo Galilei INAF, La Palma, Spain

[13] Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, Via S Sofia 78, I-95123 Catania, Italy

[14] INAF Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 691卷

基金：

欧洲研究理事会;

关键词：

accretion; accretion disks; stars: neutron; pulsars: individual: IGR J17498-2921; X-rays: binaries; SAX J1808.4-3658; BROAD-BAND; XMM-NEWTON; SRGA J144459.2-604207; MAGNETIC-FIELDS; HOT-SPOTS; SPIN-DOWN; REFLECTION; DISCOVERY; SPECTROSCOPY;

D O I：

10.1051/0004-6361/202451703

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a comprehensive study of the spectral properties of the accreting millisecond X-ray pulsar IGR J17498-2921 during its 2023 outburst. Similar to other accreting millisecond X-ray pulsars, the broadband spectral emission observed quasi-simultaneously by NICER and NuSTAR is well described by an absorbed Comptonized emission with an electron temperature of similar to 17 keV plus a disk reflection component. The broadening of the disk reflection spectral features, such as a prominent iron emission line at 6.4-6.7 keV, is consistent with the relativistic motion of matter in a disk truncated at similar to 21 R-g from the source, near the Keplerian corotation radius. From the high-cadence monitoring data obtained with NICER, we observed that the evolution of the photon index and the temperature of seed photons tracks variations in the X-ray flux. This is particularly evident close to a sudden similar to-0.25 cycle jump in the pulse phase, which occurs immediately following an X-ray flux flare and a drop in the pulse amplitude below the 3 sigma detection threshold. We also report on the non-detection of optical pulsations with TNG/SiFAP2 from the highly absorbed optical counterpart.

引用

页数：14

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