A1 Journal article – refereed
X-Ray Pulsar XTE J1858+034: Discovery of the Cyclotron Line and the Revised Optical Identification
List of Authors: Tsygankov Sergey S., Lutovinov Alexander A., Molkov Sergey V., Djupvik Anlaug A., Karasev Dmitri I., Doroshenko Victor, Mushtukov Alexander A., Malacaria Christian, Kretschmar Peter, Poutanen Juri
Publisher: IOP PUBLISHING LTD
Publication year: 2021
Journal: Astrophysical Journal
Journal name in source: ASTROPHYSICAL JOURNAL
Journal acronym: ASTROPHYS J
Volume number: 909
Issue number: 2
Number of pages: 10
ISSN: 0004-637X
eISSN: 1538-4357
DOI: http://dx.doi.org/10.3847/1538-4357/abddbd
URL: https://iopscience.iop.org/article/10.3847/1538-4357/abddbd
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 similar to ~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.
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