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SMC X-3: the closest ultraluminous X-ray source powered by a neutron star with non-dipole magnetic field
Astronomy and Astrophysics. 2017. Vol. 605. P. А39/1–А39/8.
Lutovinov A.
Aims: The magnetic field of accreting neutron stars determines their overall behavior including the maximum possible luminosity. Some models require an above-average magnetic field strength (≳1013 G) in order to explain super-Eddington mass accretion rate in the recently discovered class of pulsating ultraluminous X-ray sources (ULX). The peak luminosity of SMC X-3 during its major outburst in 2016-2017 reached 2.5 × 1039 erg s-1 comparable to that in ULXs thus making this source the nearest ULX-pulsar. Determination of the magnetic field of SMC X-3 is the main goal of this paper.
Methods: SMC X-3 belongs to the class of transient X-ray pulsars with Be optical companions, and exhibited a giant outburst in July 2016-March 2017. The source has been observed over the entire outburst with the Swift/XRT and Fermi/GBM telescopes, as well as the NuSTAR observatory. Collected data allowed us to estimate the magnetic field strength of the neutron star in SMC X-3 using several independent methods.
Results: Spin evolution of the source during and between the outbursts, and the luminosity of the transition to the so-called propeller regime in the range of (0.3-7) × 1035 erg s-1 imply a relatively weak dipole field of (1-5) × 1012 G. On the other hand, there is also evidence for a much stronger field in the immediate vicinity of the neutron star surface. In particular, transition from super- to sub-critical accretion regime associated with the cease of the accretion column and very high peak luminosity favor a field that is an order of magnitude stronger. This discrepancy makes SMC X-3 a good candidate for possessing significant non-dipolar components of the field, and an intermediate source between classical X-ray pulsars and accreting magnetars which may constitute an appreciable fraction of ULX population.
Аксенов О. И., Fuks A., Aronin A., Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques 2024 Vol. 18 No. 1 P. 8–13
Added: June 1, 2024
Fuks A., Аксенов О. И., Aronin A., Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques 2024 Vol. 18 No. 1 P. 8–13
Added: May 31, 2024
Denis A. Grachev, Mikhailov E., Zhikhareva E., Open Astronomy 2023 Vol. 32 No. 1 Article 2022021
Magnetic fields of various astrophysical objects
are described using the dynamo mechanism. Corresponding
equations in the three-dimensional case are quite difficult
to be solved. So, the two-dimensional models can be useful
for such problems. For galactic and accretion discs, it is
convenient to use the no-z approximation. The initial conditions
for the magnetic field have a special interest. It
seems that the ...
Added: March 9, 2023
Biryukov A., Abolmasov P., Monthly Notices of the Royal Astronomical Society 2021 Vol. 505 No. 2 P. 1775–1786
The rotation of a magnetized accreting neutron star (NS) in a binary system is described by its spin period and two angles: spin inclination α with respect to the orbital momentum and magnetic angle χ between the spin and the magnetic moment. Magnetospheric accretion spins the NS up and adjusts its rotation axis, decreasing α ...
Added: October 31, 2022
Stepanova I. E., Gudkova T. V., Salnikov A. M. et al., Inverse Problems in Science and Engineering 2022 Vol. 30 No. 1 P. 41–60
A new three-staged technique based on various versions of the linear integral representation method (S-, F- and R-approximations) is applied to solve the problem of analytical modelling of the magnetic field on the surface of Mars. At the first step, we build an analytical approximation from the given data set (in local or regional cases). ...
Added: October 28, 2022
Gorban A., Мольков С. В., Цыганков С. С. et al., Письма в Астрономический журнал 2022 Т. 48 № 4 С. 279–289
The results of the broadband spectral and timing study of the transient X-ray pulsar GRO J2058+42 in a wide energy range at a low luminosity Lx ≃ 2.5 × 10^36 erg s^−1 are reported. The data revealed that the pulse profile and pulse fraction of the source are significantly changed in comparison with previous NuSTAR ...
Added: June 16, 2022
S.I. Popel, Golub' A. P., Kassem A. I. et al., Physics of Plasmas 2022 Vol. 29 No. 1 Article 013701
The influence of the magnetic field of the Earth’s magnetotail on dusty plasmas above the sunlit surface of the Moon is studied. For this purpose, a physical-mathematical model for a self-consistent description of dust grains and photoelectrons in the presence of the magnetic field is developed. Trajectories of motion of dust grains above the lunar surface are considered. ...
Added: January 19, 2022
Gorban A., Мольков С. В., Цыганков С. С. et al., Письма в Астрономический журнал 2021 Т. 47 № 6 С. 416–427
We present the results of our spectral and timing analysis of the emission from the transient X-ray pulsar XTE J1946+274 based on the simultaneous NuSTAR and Swift/XRT observations in the broad energy range 0.3–79 keV carried out in June 2018 during a bright outburst. Our spectral analysis has confirmed the presence of a cyclotron absorption ...
Added: November 18, 2021
Mikhailov E. A., Elistratov S. A., Grachev D., Computational Mathematics and Modeling 2021 Vol. 32 No. 1 P. 45–51
We investigate a stochastic model of the galactic dynamo in the planar approximation, assuming that turbulent diffusivity is a renewal process. For linear and nonlinear modifications of this model, numerical methods are applied to construct statistical moments and correlation tensors of the magnetic field. ...
Added: October 31, 2021
Sazonov S., Kulkarni S., Monthly Notices of the Royal Astronomical Society 2021 Vol. 508 No. 3 P. 3820–3847
We present the first sample of tidal disruption events (TDEs) discovered during the SRG all-sky survey. These 13 events were selected among X-ray transients detected in the 0° < l < 180° hemisphere by eROSITA during its second sky survey (2020 June 10 to December 14) and confirmed by optical follow-up observations. The most distant ...
Added: October 27, 2021
Sazonov S., New Astronomy Reviews 2020 Vol. 88 P. 101536
Seventeen years of hard X-ray observations with the instruments of the INTEGRAL observatory, with a focus on the Milky Way and in particular on the Galactic Centre region, have provided a unique database for exploration of the Galactic population of low-mass X-ray binaries (LMXBs). Our understanding of the diverse energetic phenomena associated with accretion of ...
Added: November 16, 2020
Sazonov S., Monthly Notices of the Royal Astronomical Society 2019 Vol. 489 No. 1 P. 1127–1138
There is a hope that looking into the early Universe with next-generation telescopes, one will be able to observe the early accretion growth of supermassive black holes (BHs) when their masses were ∼104-106 M☉. According to the standard accretion theory, the bulk of the gravitational potential energy released by radiatively efficient accretion of matter on to ...
Added: August 6, 2020
Kechiev L., М.: Грифон, 2019.
На основе обобщения отечественного и мирового опыта рассматривается комплекс вопросов, связанных с разработкой эффективных экранов для радиоэлектронной аппаратуры (РЭА), работающей в широком частотном диапазоне. Защита РЭА от воздействия электромагнитных полей представлена комплексно: от концепции экранирования до методики расчета неоднородных экранов; от металлических материалов до перспективных композитных и наноматериалов, применяемых при экранировании. В пособии рассматривается концепция ...
Added: October 21, 2019
Lutovinov A., Monthly Notices of the Royal Astronomical Society 2019 Vol. 482 No. 1 P. 1392–1405
We report a discovery of low-frequency quasi-periodic oscillation at 0.3-0.7 Hz in the power spectra of the accreting black hole GRS 1739-278 in the hard-intermediate state during its 2014 outburst based on the NuSTAR and Swift/XRT data. The QPO frequency strongly evolved with the source flux during the NuSTAR observation. The source spectrum became softer ...
Added: February 7, 2019
Makarov A. A., Physical Review A: Atomic, Molecular, and Optical physics 2015 Vol. 92 No. 5 P. 053840 – 053840
Absorption spectrum of a system of two closely spaced identical atoms displays, at certain preparation, a dip that can be much narrower than the natural linewidth. This preparation includes (i) application of a strong magnetic field at an angle α, that is very close to the magic angle α0 = arccos √(1/ 3) ≈ 54.7◦, with ...
Added: November 12, 2018
В. И. Юдсон, А. А. Макаров, Письма в Журнал экспериментальной и теоретической физики 2017 Т. 105 № 3 С. 193–197
A method is proposed for the creation of an entangled metastable (subradiance) excited state in a system of two closely spaced identical atoms. The system of unexcited atoms is first placed in a magnetic field that is directed at a magic angle of \alpha_0= arccos(1/ 3) ≈ 54.7° to the line connecting the atoms and ...
Added: November 12, 2018
Redchenko E. S., A. A. Makarov, V. I. Yudson, Physical Review A: Atomic, Molecular, and Optical physics 2018 Vol. 97 No. 4 P. 043812-1–043812-15
Spontaneous emission spectra of two initially excited closely spaced identical atoms are very sensitive to the strength and the direction of the applied magnetic field. We consider the relevant schemes that ensure the determination of the mutual spatial orientation of the atoms and the distance between them by entirely optical means. A corresponding theoretical description ...
Added: November 12, 2018
Lutovinov A., Monthly Notices of the Royal Astronomical Society: Letters 2018 Vol. 479 No. 1 P. L134–L138
We report on the monitoring of the final stage of the outburst from the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124, which reached ˜40 Eddington luminosities. The main aim of the monitoring program with the Swift/XRT telescope was to measure the magnetic field of the neutron star using the luminosity of transition to the `propeller' ...
Added: November 1, 2018
Shapoval S., Le Mouël J. -., Shnirman M. G. et al., Astronomy and Astrophysics 2018 Vol. 618 P. A183-1–A183-13
The hypothesis stating that the distribution of sunspot groups versus their size ($\varphi$) follows a power law in the domain of small groups was recently highlighted but rejected in favor of a Weibull distribution. In this paper we re-consider this question, and are led to the opposite conclusion. We suggest a new definition of group ...
Added: October 26, 2018
Lipunova G. V., Malanchev K., Shakura N. I., , in: Accretion Flows in Astrophysics.: Springer International Publishing, 2018. Ch. 1 P. 1–106.
Accretion discs are powerful energy factories in our Universe. They effectively transform the potential energy of gravitational interaction to emission, thereby unraveling the physics of distant objects. This is possible due to the presence of viscosity, driven by turbulent motions in accretion discs. In this chapter, we describe the equations for disc accretion in the ...
Added: October 26, 2018
Shakura N. I., Lipunova G. V., Malanchev K. et al., Springer International Publishing, 2018.
This book highlights selected topics of standard and modern theory of accretion onto black holes and magnetized neutron stars. The structure of stationary standard discs and non-stationary viscous processes in accretion discs are discussed to the highest degree of accuracy analytic theory can provide, including relativistic effects in flat and warped discs around black holes. ...
Added: October 26, 2018
Oknyansky V., Malanchev Konstantin L., Gaskell C. M., , in: Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe (NLS1-2018), 9-13 April 2018, Padova Botanical Garden, ItalyIssue 328: Proceedings of Science.: Trieste: Scuola Internazionale Superiore di Studi Avanzati (SISSA), 2018. Ch. 12 P. 1–6.
Two major challenges to unification schemes for active galactic nuclei (AGN) activity are the existence of Narrow-Line Seyfert 1s (NLS1s) and the existence of changing-look (CL) AGNs. AGNs can drastically change their spectral appearance in the optical (changing their Seyfert type) and/or in the X-ray region. We illustrate the CL phenomenon with our multi-wavelength monitoring ...
Added: October 26, 2018
Malanchev K., Journal of Physics: Conference Series 2016 Vol. 675 No. 3 P. 1–4
We describe phenomenon of X-ray Novae in a model of non-stationary accretion α-disk with account for irradiation and vertical convection in outer disk region. We extended the commonly used disk vertical structure model by adding viscous turbulent energy generation in mixing length theory. This model was used to simulate both optical and X-ray light curves ...
Added: February 1, 2018