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http://hdl.handle.net/2289/7922| Title: | Discovery of quasi-periodic oscillations in the persistent X-ray emission of accreting binary X-ray pulsar LMC X-4 |
| Authors: | Rikame, Ketan Paul, Biswajit Pradhan, Pragati Paul, K.T. |
| Keywords: | stars: neutron pulsars: general, X-rays: binaries X-rays LMC X-4 |
| Issue Date: | 1-Jun-2022 |
| Publisher: | Royal Astronomical Society |
| Citation: | Monthly Notices of the Royal Astronomical Society, 2022, Vol. 512, p4792 |
| Abstract: | We report the discovery of quasi-periodic oscillations (QPOs) in the high-mass X-ray binary (HMXB) pulsar LMC X-4 in its non-flaring (persistent) state using observations with XMM–Newton. In addition to the 74 mHz coherent pulsations, the persistent emission light curve shows a QPO feature in the frequency range of 20–30 mHz. Quasi-periodic flares have been previously observed from LMC X-4 in observations made with Rossi X-ray Timing Explorer (RXTE). However, this is the first time QPOs have been observed in the persistent emission observations of LMC X-4. QPOs in X-ray binaries are generally thought to be related to the rotation of the inhomogeneous matter distribution in the inner accretion disc. In HMXBs such as LMC X-4 where the compact object is a neutron star with a high magnetic field, the radius of the inner accretion disc is determined by the mass accretion rate and the magnetic moment of the neutron star. In such systems, the QPO feature, along with the pulse period and X-ray luminosity measurement, helps us to constrain the magnetic field strength of the neutron star. We use considerations of magnetospheric accretion to have an approximate value of the magnetic field strength of the neutron star in LMC X-4. |
| Description: | Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations) |
| URI: | http://hdl.handle.net/2289/7922 |
| ISSN: | 0035-8711 1365-2966 (Online) |
| Alternative Location: | https://ui.adsabs.harvard.edu/abs/2022MNRAS.512.4792R/abstract https://arxiv.org/abs/2203.07981 https://doi.org/10.1093/mnras/stac729 |
| Copyright: | 2022 The Author(s) |
| Appears in Collections: | Research Papers (A&A) |
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|---|---|---|---|---|
| 2022_MNRAS_Vol.512_p4792.pdf Restricted Access | Restricted Access | 640.57 kB | Adobe PDF | View/Open Request a copy |
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