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Measuring the Magnetic Field Strength of a Transient X-ray Pulsar 4U 1901+03 by Its Variability on Different Time Scales




TekijätMereminskiy, I. A.; Semena, A. N.; Lutovinov, A. A.; Tsygankov, S. S.; Molkov, S. V.; Karasev, D. I.

KustantajaPleiades Publishing Ltd

KustannuspaikkaNEW YORK

Julkaisuvuosi2025

JournalAstronomy Letters / Pis'ma v Astronomicheskii Zhurnal

Tietokannassa oleva lehden nimiAstronomy Letters

Lehden akronyymiASTRON LETT+

Vuosikerta50

Numero10

Aloitussivu600

Lopetussivu607

Sivujen määrä8

ISSN1063-7737

eISSN1562-6873

DOIhttps://doi.org/10.1134/S1063773724700506

Verkko-osoitehttps://doi.org/10.1134/s1063773724700506


Tiivistelmä
By combining data from several X-ray telescopes (Swift/XRT, NICER, Chandra) we reconstructed a profile of the 2019 outburst of accreting X-ray pulsar 4U 1901+03 from its peak down to the return to the "low" state. Softening of the X-ray spectrum and disappearance of the pulsations at a later stages of the outburst tentatively indicates that the source transitioned to the "propeller" state at luminosity about 10(36) erg s(-1), which corresponds to a magnetic field strength of B less than or similar to 10(12) G at the neutron star surface. We also investigated the fast X-ray variability that was observed during the peak of 2003 outburst. The shape of the power spectrum could be described with a broken power law, with a break frequency of 7.5 Hz. Assuming that this frequency corresponds to a viscous frequency at a magnetospheric boundary we estimated magnetic field strength as B approximate to 7 x 10(11) G, which is similar to the estimate obtained from observed transition to the "propeller" regime.


Julkaisussa olevat rahoitustiedot
This study was supported by the Ministry of Science and Higher Education of the Russian Federation (grant no. 075-15-2024-647).


Last updated on 2025-12-03 at 10:59