SRG/ART-XC, Swift, NICER, and NuSTAR study of different states of the transient X-ray pulsar MAXI J0903-531
| Autor: | Joern Wilms, Victor Doroshenko, Sergey V. Molkov, Alexander A. Mushtukov, A. Semena, Sergey S. Tsygankov, P. Thalhammer, Alexander A. Lutovinov, Ilya A. Mereminskiy |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Accretion
Astrophysics::High Energy Astrophysical Phenomena Cyclotron FOS: Physical sciences Astrophysics 7. Clean energy 01 natural sciences Astrophysics - high energy astrophysical phenomena Spectral line law.invention Pulsar law 0103 physical sciences Radiative transfer Stars - neutron Absorption (electromagnetic radiation) 010303 astronomy & astrophysics High Energy Astrophysical Phenomena (astro-ph.HE) Physics 010308 nuclear & particles physics Astronomy and Astrophysics X-rays - binaries Magnetic field Neutron star Space and Planetary Science Magnetic fields Accretion disks Pulsars - individual - MAXI J0903-531 X-ray pulsar Fermi Gamma-ray Space Telescope |
| Zdroj: | Astronomy & Astrophysics, 661:A45 |
| Popis: | 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 differing by a factor of ~30 are reported. The observed X-ray spectrum in both states can be described as a classical pulsar-like spectrum consisting of the power-law with the high-energy cutoff. We argue that absence of the spectrum transformation to the two-hump structure expected at low fluxes points to a relatively weak magnetic field of the neutron star below (2-3)$\times10^{12}$ G. This estimate is consistent with other indirect constraints and non-detection of any absorption features which can be interpreted as a cyclotron absorption line. 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. Accepted to A&A for publication in the Special Issue: The Early Data Release of eROSITA and Mikhail Pavlinsky ART-XC on the SRG Mission. 8 pages, 6 figures |
| Databáze: | OpenAIRE |
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