A1 Refereed original research article in a scientific journal

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




AuthorsTsygankov 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

PublisherIOP PUBLISHING LTD

Publication year2021

JournalAstrophysical Journal

Journal name in sourceASTROPHYSICAL JOURNAL

Journal acronymASTROPHYS J

Article numberARTN 154

Volume909

Issue2

Number of pages10

ISSN0004-637X

eISSN1538-4357

DOIhttps://doi.org/10.3847/1538-4357/abddbd

Web address https://iopscience.iop.org/article/10.3847/1538-4357/abddbd

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/53689812


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 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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Last updated on 2024-26-11 at 15:55