SRG/ART-XC, Swift, NICER, and NuSTAR study of different states of the transient X-ray pulsar MAXI J0903-531
Tsygankov SS, Molkov S, Doroshenko V, Mushtukov AA, Mereminskiy IA, Semena AN, Thalhammer P, Wilms J, Lutovinov AA (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 661
DOI: 10.1051/0004-6361/202141821
Abstract
The results of the broadband spectral and timing study of the recently discovered transient X-ray pulsar MAXI J0903-531 in a wide range of luminosities that differ by a factor of similar to 30 are reported. The observed X-ray spectrum in both states can be described as a classical pulsar-like spectrum consisting of a power law with a high-energy cutoff. We argue that the absence of the spectrum transformation to the two-hump structure that is expected at low fluxes indicates that the magnetic field of the neutron star is relatively weak below (2-3) x 10(12) G. This estimate is consistent with other indirect constraints and non-detection of any absorption features that might be interpreted as a cyclotron absorption line. The timing analysis of the NuSTAR data revealed only slight variations of a single-peaked pulse profile of the source as a function of the energy band and mass accretion rate. In both intensity states, the pulsed fraction increases from 40% to roughly 80% with the energy. Finally, we were also able to obtain the orbital solution for the binary system using data from the Fermi/GBM, NICER, and NuSTAR instruments.
Authors with CRIS profile
Philipp Thalhammer
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut
Jörn Wilms
Lehrstuhl für Astronomie und Astrophysik
Involved external institutions
Russian Federation (RU)How to cite
APA:
Tsygankov, S.S., Molkov, S., Doroshenko, V., Mushtukov, A.A., Mereminskiy, I.A., Semena, A.N.,... Lutovinov, A.A. (2022). SRG/ART-XC, Swift, NICER, and NuSTAR study of different states of the transient X-ray pulsar MAXI J0903-531. Astronomy & Astrophysics, 661. https://dx.doi.org/10.1051/0004-6361/202141821
MLA:
Tsygankov, Sergey S., et al. "SRG/ART-XC, Swift, NICER, and NuSTAR study of different states of the transient X-ray pulsar MAXI J0903-531." Astronomy & Astrophysics 661 (2022).
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