X-Ray Pulsar XTE J1858+034: Discovery of the Cyclotron Line and the Revised Optical Identification
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 2021
- DOI:
- 10.3847/1538-4357/abddbd
- arXiv:
- arXiv:2101.07030
- Bibcode:
- 2021ApJ...909..154T
- Keywords:
-
- Accretion;
- Stellar accretion disks;
- Magnetic fields;
- Binary pulsars;
- Neutron stars;
- High mass x-ray binary stars;
- X-ray binary stars;
- 14;
- 1579;
- 994;
- 153;
- 1108;
- 733;
- 1811;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 12 pages, 12 figures, accepted by ApJ