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Discovery of two cyclotron resonance scattering features in X-ray pulsar cen X-3 by Insight-HXMT.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Mar2023, Vol. 519 Issue 4, p5402-5409. 8p. - Publication Year :
- 2023
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Abstract
- We present the results of the neutron star X-ray binary system Cen X-3 performed by Insight -HXMT with two observations during 2017 and 2018. During these two observations, the source reached a X-ray luminosity of ∼1038 erg s−1 from 2–105 keV. The analysis of the broadband X-ray spectrum reports the presence of two cyclotron resonance scattering features (CRSFs) with the fundamental line at ∼ 28 keV and the harmonic line at ∼47 keV. The multiple lines exist by fittings with different continuum models, like the absorbed negative and positive power-law with an exponential cutoff (NPEX) model and a power-law with high energy exponential cutoff model. This is the first time that both fundamental and harmonic lines are detected in Cen X-3. We also show evidence of two cyclotron lines in the phase-resolved spectrum of Cen X-3. The CRSF and continuum spectral parameters show evolution with the pulse profile, and the two line centroid energy ratio does not change significantly and locates in a narrow value range of 1.6−1.7 over the pulse phase. The implications of the discovering two cyclotron absorption features and phase-resolved spectral properties are discussed. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CYCLOTRON resonance
*X-ray binaries
*BINARY stars
*X-ray scattering
*PULSARS
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 519
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 161764467
- Full Text :
- https://doi.org/10.1093/mnras/stad048