X-ray pulsar XTE J1858+034: discovery of the cyclotron line and the revised optical identification

Abstract

We present results of a detailed investigation of the poorly studied X-ray pulsar XTE J1858+034 based on the data obtained with the NuSTAR observatory during the outburst of the source in 2019. The spectral analysis resulted in the discovery of a cyclotron absorption feature in the source spectrum at ~48 keV both in the pulse phase averaged and resolved spectra. Accurate X-ray localization of the source using the NuSTAR and Chandra observatories allowed us to accurately determine the position of the X-ray source and identify the optical companion of the pulsar. The analysis of the counterpart properties suggested that the system is likely a symbiotic binary hosting an X-ray pulsar and a late type companion star of K-M classes rather than Be X-ray binary as previously suggested.

arXiv comment12 pages, 12 figures, accepted by ApJ

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• Energy-resolved pulse profiles of accreting pulsars: Diagnostic tools for spectral features
• Catalog of the Galactic population of X-ray pulsars in High-mass X-ray binary systems
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