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Correlating non-linear properties with spectral states of RXTE data: possible observational evidences for four different accretion modes around compact objects

Adegoke, Oluwashina and Dhang, Prasun and Mukhopadhyay, Banibrata and Ramadevi, M C and Bhattacharya, Debbijoy (2018) Correlating non-linear properties with spectral states of RXTE data: possible observational evidences for four different accretion modes around compact objects. In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 476 (2). pp. 1581-1595.

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Official URL: http://dx.doi.org/ 10.1093/mnras/sty263

Abstract

By analysing the time series of RXTE/PCA data, the non-linear variabilities of compact sources have been repeatedly established. Depending on the variation in temporal classes, compact sources exhibit different non-linear features. Sometimes they show low correlation/fractal dimension, but in other classes or intervals of time they exhibit stochastic nature. This could be because the accretion flow around a compact object is a non-linear general relativistic system involving magnetohydrodynamics. However, the more conventional way of addressing a compact source is the analysis of its spectral state. Therefore, the question arises: What is the connection of non-linearity to the underlying spectral properties of the flow when the non-linear properties are related to the associated transport mechanisms describing the geometry of the flow? This work is aimed at addressing this question. Based on the connection between observed spectral and non-linear (time series) properties of two X-ray binaries: GRS 1915+105 and Sco X-1, we attempt to diagnose the underlying accretion modes of the sources in terms of known accretion classes, namely, Keplerian disc, slim disc, advection dominated accretion flow and general advective accretion flow. We explore the possible transition of the sources from one accretion mode to others with time. We further argue that the accretion rate must play an important role in transition between these modes.

Item Type: Journal Article
Additional Information: Copy right for this article belong to OXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 16 May 2018 15:57
Last Modified: 16 May 2018 15:57
URI: http://eprints.iisc.ac.in/id/eprint/59862

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