Pulse frequency fluctuations of persistent accretion powered pulsars

Download

index.pdf

Date

2022-11-01

Author

Serim, D.
Serim, Muhammed Miraç
Baykal, Altan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

111
views

45
downloads

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

Suggestions

OpenMETU
Core

Frequency Resolved Spectroscopy of XB 1323-619 and EXO 0748-676 Balman, Şölen (2009-09-11) We present the frequency resolved energy spectra (FRS) of the low-mass X-ray binary dipper XB 1323-619 and EXO 0748-676 using archival XMM-Newton observations. The FRS of XB 1323-619 is well described by a single blackbody component with kT in a range 1.2-1.6 keV. We attribute this to an existing boundary layer, the likely source of the soft emission, supported by radiation pressure. We detect a different form of FRS for the frequency ranges 0.9-6 Hz and 8-30 Hz which is modeled best with a power law and a ...
Timing studies of X Persei and the discovery of its transient quasi-periodic oscillation feature Acuner, Z.; İNAM, SITKI ÇAĞDAŞ; Sahiner, S.; Serim, Muhammed Miraç; Baykal, Altan; Swank, J. (2014-10-11) We present a timing analysis of X Persei (X Per) using observations made between 1998 and 2010 with the Proportional Counter Array (PCA) onboard the Rossi X-ray Timing Explorer (RXTE) and with the INTEGRAL Soft Gamma-Ray Imager (ISGRI). All pulse arrival times obtained from the RXTE-PCA observations are phase-connected and a timing solution is obtained using these arrival times. We update the long-term pulse frequency history of the source by measuring its pulse frequencies using RXTE-PCA and ISGRI data. Fr...
Timing and spectral analysis of 2S 1417-624 during its 2018 outburst Serim, Muhammed Miraç; Ozudogru, O. C.; Donmez, C. K.; Sahiner, S.; Serim, D.; Baykal, Altan; Inam, S. C. (2022-02-01) We investigate timing and spectral characteristics of the transient X-ray pulsar 2S 1417-624 during its 2018 outburst with NICER follow up observations. We describe the spectra with high-energy cut-off and partial covering fraction absorption (PCFA) model and present flux-dependent spectral changes of the source during the 2018 outburst. Utilizing the correlation-mode switching of the spectral model parameters, we confirm the previously reported sub-critical to critical regime transitions and we argue that ...
X-ray flux and pulse frequency changes of three high mass X-ray binary pulsars: Vela X-1, GX 301-2 and OAO 1657-415 Inam, SC; Baykal, Altan (2000-01-01) Using archival BATSE (Burst and Transient Source Experiment) 20-50 keV band X-ray flux and pulse frequency time series, we look for correlations between torque, luminosity and specific angular momentum for three high mass X-ray binary pulsars Vela X-1, GX 301-2 and OAO 1657-415. Our results show that there is no correlation between pulse frequency derivative and flux which may be an indication of the absence of stable prograde accretion disk. From the strong correlation of specific angular momentum and torq...
Modelling of quasi-periodic oscillations with wave packets Alpar, MA; Yilmaz, A (1997-01-01) Model dispersion relations are introduced to explore power spectra of the normal-branch (NB) and horizontal-branch (HB) quasi-periodic oscillations (QPOs; for reviews see Van der Klis (1989)[ARA&A, 27, 517], (1992) [Proc. of NATO ASI X-Ray Binaries and Recycled Pulsars, eds. E.P.J. Van den Heuvel & S.A. Rappaport, Kluwer, Dordrecht], (1995)[Proc, of NATO ASI The Lives of the Neutron Stars, eds. M.A. Alpar, Omit Kiziloglu, & J. van Paradijs, Kluwer, Dordrecht]) of low mass X-ray binaries (LMXBs) in terms of ...

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.