The X-Ray Pulsar XTE J1858+034 Observed with NuSTAR and Fermi/GBM: Spectral and Timing Characterization plus a Cyclotron Line

被引：7

作者：

Malacaria, C. ^{[1
,2
]}

Kretschmar, P. ^{[3
]}

Madsen, K. K. ^{[4
,5
,6
,7
]}

Wilson-Hodge, C. A. ^{[8
]}

Coley, Joel B. ^{[4
,9
,10
]}

Jenke, P. ^{[11
]}

Lutovinov, Alexander A. ^{[12
]}

Pottschmidt, K. ^{[4
,6
,7
,10
]}

Tsygankov, Sergey S. ^{[12
,13
]}

Wilms, J. ^{[14
,15
]}

机构：

[1] NASA, Marshall Space Flight Ctr, NSSTC, 320 Sparkman Dr, Huntsville, AL 35805 USA

[2] Univ Space Res Assoc, Sci & Technol Inst, 320 Sparkman Dr, Huntsville, AL 35805 USA

[3] European Space Agcy ESA, European Space Astron Ctr ESAC, Camino Bajo Castillo S-N, E-28692 Madrid, Spain

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

[5] NASA, Goddard Space Flight Ctr, Xray Astrophys Lab, Greenbelt, MD 20771 USA

[6] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA

[7] Univ Maryland Baltimore Cty, Ctr Space Sci & Technol, Baltimore, MD 21250 USA

[8] NASA, ST Astrophys Branch 12, Marshall Space Flight Ctr, Huntsville, AL 35812 USA

[9] Howard Univ, Dept Phys & Astron, Washington, DC 20059 USA

[10] NASA, Goddard Space Flight Ctr, Astroparticle Phys Lab, Greenbelt, MD 20771 USA

[11] Univ Alabama Huntsville UAH, Ctr Space Plasma & Aeron Res CSPAR, 301 Sparkman Dr, Huntsville, AL 35899 USA

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

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

[14] Friedrich Alexander Univ Erlangen Nurnberg, Remeis Observ, Sternwartstr 7, D-96049 Bamberg, Germany

[15] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Sternwartstr 7, D-96049 Bamberg, Germany

来源：

ASTROPHYSICAL JOURNAL | 2021年 / 909卷 / 02期

基金：

俄罗斯科学基金会;

关键词：

X-ray binary stars; Neutron stars; Pulsars; Accretion; Stellar accretion disks; Magnetic fields; COMPTONIZATION; ACCRETION; ABSORPTION; EMISSION; PERIOD; BULK;

D O I：

10.3847/1538-4357/abddbc

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Accreting X-ray pulsars (XRPs) undergo luminous X-ray outbursts during which the spectral and timing behavior of the neutron star can be studied in detail. We analyze a NuSTAR observation of the XRP XTE J1858+034 during its outburst in 2019. The spectrum is fit with a phenomenological, a semiempirical, and a physical spectral model. A candidate cyclotron line is found at 48 keV, implying a magnetic field of 5.4 x 10(12) G at the site of emission. This is also supported by the physical best-fit model. We propose an orbital period of about 81 days based on the visual inspection of the X-ray outburst recurrence time. Based on Fermi/GBM data, the standard disk accretion-torque theory allowed us to infer a distance of 10.9 1.0 kpc. Pulse profiles are single-peaked and show a pulsed fraction that is strongly energy-dependent at least up to 40 keV.

引用

页数：7

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