Correlating the non-linear time series and spectral properties of IGR J17091-3624: Is it similar to GRS 1915+105?

Adegoke, O and Mukhopadhyay, B and Misra, R (2020) Correlating the non-linear time series and spectral properties of IGR J17091-3624: Is it similar to GRS 1915+105? In: Monthly Notices of the Royal Astronomical Society, 492 (3). pp. 4033-4042.

PDF MON_NOT_ROY_AST_SOC_3_4033-4042_2020.pdf - Published Version Restricted to Registered users only Download (2MB)

Abstract

Using the correlation integral method, we explore the non-linear properties of IGR J17091- 3624 by comparing the underlying behaviour to GRS 1915+105. We find that while GRS 1915+105 is known to reveal a combination of fractal (or even chaotic) and stochastic behaviours depending on its temporal class, IGR J17091-3624 mostly shows stochastic behaviour. Therefore, although several observations find that IGR J17091-3624 is similar to GRS 1915+105, and that they have temporal classes in common, the underlying non-linear time series analyses offer a different view. Nevertheless, the ratio of the Poisson noise to rms variation for IGR J17091-3624 turns out to be high, suggesting that it is dominated by Poisson noise. Hence it might plausibly lead to the suppression of its non-linear properties, if there is any. Indeed, IGR J17091-3624 is a very faint source compared with GRS 1915+105. However, by increasing the time bin, some of the temporal classes of IGR J17091-3624 show deviation from stochasticity, indicating the plausibility of a higher fractal dimension. Along with spectral analysis, overall IGR J17091-3624 seems to reveal three different accretion classes: Slim, Keplerian and advective accretion discs. © 2020 The Author(s).

Item Type:	Journal Article
Publication:	Monthly Notices of the Royal Astronomical Society
Publisher:	Oxford University Press
Additional Information:	Copy right for this article belongs to Oxford University Press
Keywords:	accretion, accretion discs – black hole physics – X-rays: individual: IGR J17091– 3624 – X-rays: individual: GRS 1915+105.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	01 Jan 2021 10:36
Last Modified:	01 Jan 2021 10:36
URI:	http://eprints.iisc.ac.in/id/eprint/65502

Actions (login required)

View Item