Pulse frequency fluctuations of persistent accretion powered pulsars

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2022-11-01

Author

Serim, D.
Serim, Muhammed Miraç
Baykal, Altan

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In this study, we examine the long-term torque noise fluctuations of persistent X-ray binaries Her X-1, Vela X-1, GX 301-2, Cen X-3, 4U 1538-53, OAO 1657-415, and 4U 1626-67 using the historical pulse frequency measurements provided by CGRO/BATSE and Fermi/GBM. We find that known disc-fed sources exhibit a 1/omega(2) red noise component in their power density spectra which is saturated over long time-scales. On the other hand, wind-fed sources form a clear white noise component, and the wind-fed sources with occasional transient disc formation imprint 1/omega type flicker noise. We discuss their long-term timing noise properties based on the models to describe the power density spectrum of pulse frequency derivative fluctuations in terms of monochromatic and coloured noise processes. Furthermore, we investigate the relation between measured timing noise strengths and other independently measured physical parameters. Despite the low number of sample sources, we suggest that the noise strengths of these sources are correlated with their luminosities and uncorrelated with their magnetic field strengths, implying that the dominant noise-generating mechanism is accretion.

Subject Keywords

accretion, accretion discs, methods: data analysis, pulsars: general, X-rays: binaries, X-RAY PULSAR, CYCLOTRON LINE ENERGY, NEUTRON-STAR MODEL, TIMING NOISE, SPIN-UP, SPECTRAL-ANALYSIS, CENTAURUS X-3, 4U 1626-67, PARAMETER-ESTIMATION, OPTICAL COUNTERPART

URI

https://hdl.handle.net/11511/101839

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

DOI

https://doi.org/10.1093/mnras/stac3076

Collections

Department of Physics, Article

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Citation Formats

D. Serim, M. M. Serim, and A. Baykal, “Pulse frequency fluctuations of persistent accretion powered pulsars,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 518, no. 1, pp. 1–12, 2022, Accessed: 00, 2023. [Online]. Available: https://hdl.handle.net/11511/101839.