First characterization of a new High Mass X-ray Binary in LMC eRASSU J050810.4660653 with SRG/ART-XC, NuSTAR and Swift
arXiv:2206.03395 · doi:10.1093/mnras/stac1608
Abstract
We report results of the first detailed spectral and temporal studies of the recently discovered Be/X-ray binary eRASSU J050810.4660653 in LMC based on the data from the SRG/ART-XC, NuSTAR and Swift/XRT instruments obtained in December 2021 - May 2022 in a wide energy range of 0.5-79 keV. Pulsations with the period of s were found in the source light curve with the pulsed fraction monotonically increasing with the energy. An estimate of the orbital period of days was obtained based on the long-term monitoring of the system. The source spectrum can be well approximated with a power-law model modified by an exponential cutoff at high energies. The pulse phase-resolved spectroscopy shows a strong variation of spectral parameters depending on the phase of a neutron star rotation. We have not found any features connected with the cyclotron absorption line both in the phase-averaged and phase-resolved spectra of eRASSU J050810.4660653. However, the neutron star magnetic field was estimated around several G using different indirect methods. Discovered variations of the hardness ratio over the pulse phase is discussed in terms of physical and geometrical properties of the emitting region.
arXiv commentAccepted for publication in MNRAS. 8 pages, 6 figures, 2 tables
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