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


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.

Downloadable publication

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.




Last updated on 2021-24-06 at 08:25