Variations of cyclotron resonant scattering features in Vela X-1 revealed with Insight-HXMT
Abstract
We present a detailed study of the high-mass X-ray binary Vela X-1, using observations performed by Insight-HXMT in 2019 and 2020, concentrating on timing analysis and spectral studies including pulse phase-resolved spectroscopy. The cyclotron line energy is found to be ~21-27 and 43-50 keV for the fundamental and first harmonic, respectively. We present the evolution of spectral parameters and find that the two line centroid energy ratio E2/E1 evolved from ~2 before MJD 58900 to ~1.7 after that. The harmonic cyclotron line energy has no relation to the luminosity but the fundamental line energy shows a positive correlation with X-ray luminosity, suggesting that Vela X-1 is located in the sub-critical accreting regime. In addition, the pulse phase-resolved spectroscopy in Vela X-1 is performed. Both the cyclotron resonant scattering feature and continuum parameters show strong variability over the pulse phase with the ratio of two line energies about 2 near the peak phases and down to ~1.6 around off-peak phases. Long-term significant variations of the absorption column density and its evolution over the pulse phase may imply the existence of the clumpy wind structure near the neutron star.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 2022
- DOI:
- 10.1093/mnras/stac1520
- arXiv:
- arXiv:2206.00179
- Bibcode:
- 2022MNRAS.514.2805L
- Keywords:
-
- stars: magnetic field;
- stars: neutron;
- pulsars: individual: Vela X-1;
- X-rays: binaries;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 10 pages, MNRAS in press