Study of the X-ray Pulsar IGR J21343+4738 Based on NuSTAR, Swift, and SRG Data

We present the results of our study of the X-ray pulsar IGR J21343+4738 based on NuSTAR, Swift, and SRG observations in the wide energy range 0.3–79 keV. The absence of absorption features in the energy spectra of the source, both averaged and phase-resolved ones, has allowed us to estimate the upper and lower limits on the magnetic field of the neutron star in the binary system, B<2.5× 10^11 and B>3.4× 10^12 G, respectively. Our spectral and timing analyses have shown that IGR J21343+4738 has all properties of a quasi-persistent X-ray pulsar with a pulsation period of 322.71±0.04 s and a luminosity L_x≃ 3.3× 10^35 erg s ^-1 . Our analysis of the long-term variability of the object in X-rays has confirmed the possible orbital period of the binary system ∼34.3 days previously detected in the optical range.