Karak, Bidya Binay and Dutta, Jayanta and Mukhopadhyay, Banibrata
(2010)
*Search for chaos in neutron star systems: Is Cyg X-3 a black hole?*
In: Astrophysical Journal, 708
(1).
pp. 862-867.

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## Abstract

The accretion disk around a compact object is a nonlinear general relativistic system involving magnetohydrodynamics. Naturally, the question arises whether such a system is chaotic (deterministic) or stochastic (random) which might be related to the associated transport properties whose origin is still not confirmed. Earlier, the black hole system GRS 1915+105 was shown to be low-dimensional chaos in certain temporal classes. However, so far such nonlinear phenomena have not been studied fairly well for neutron stars which are unique for their magnetosphere and kHz quasi-periodic oscillation (QPO). On the other hand, it was argued that the QPO is a result of nonlinear magnetohydrodynamic effects in accretion disks. If a neutron star exhibits chaotic signature, then what is the chaotic/correlation dimension? We analyze RXTE/PCA data of neutron stars Sco X-1 and Cyg X-2, along with the black hole Cyg X-1 and the unknown source Cyg X-3, and show that while Sco X-1 and Cyg X-2 are low dimensional chaotic systems, Cyg X-1 and Cyg X-3 are stochastic sources. Based on our analysis, we argue that Cyg X-3 may be a black hole.

Item Type: | Journal Article |
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Related URLs: | |

Additional Information: | Copyright for this article belongs to Institute of Physics. |

Keywords: | accretion, accretion disks; stars: neutron; X-rays: binaries; X-rays: individual (Sco X-1, Cyg X-1, 2, 3) |

Department/Centre: | Division of Physical & Mathematical Sciences > Physics |

Date Deposited: | 05 Jan 2010 11:35 |

Last Modified: | 19 Sep 2010 05:54 |

URI: | http://eprints.iisc.ernet.in/id/eprint/25341 |

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