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




TekijätTsygankov 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

KustantajaIOP PUBLISHING LTD

Julkaisuvuosi2021

JournalAstrophysical Journal

Tietokannassa oleva lehden nimiASTROPHYSICAL JOURNAL

Lehden akronyymiASTROPHYS J

Artikkelin numeroARTN 154

Vuosikerta909

Numero2

Sivujen määrä10

ISSN0004-637X

eISSN1538-4357

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

Verkko-osoitehttps://iopscience.iop.org/article/10.3847/1538-4357/abddbd

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/53689812


Tiivistelmä
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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