X-Ray Pulsar XTE J1858+034: Discovery of the Cyclotron Line and the Revised Optical Identification

Author:

Tsygankov Sergey S.ORCID,Lutovinov Alexander A.ORCID,Molkov Sergey V.ORCID,Djupvik Anlaug A.ORCID,Karasev Dmitri I.,Doroshenko VictorORCID,Mushtukov Alexander A.ORCID,Malacaria ChristianORCID,Kretschmar PeterORCID,Poutanen JuriORCID

Abstract

Abstract We present the results of a detailed investigation of the poorly studied X-ray pulsar (XRP) 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 in both 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 XRP and a late-type companion star of the K-M classes rather than a Be X-ray binary as previously suggested.

Funder

Russian Science Foundation

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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