Adegoke, Oluwashina and Rakshit, Suvendu and Mukhopadhyay, Banibrata (2016) Spectral and time series analyses of the Seyfert 1 AGN: Zw 229.015. In: Monthly Notices of the Royal Astronomical Society, 466 (4). pp. 3951-3960. ISSN 0035-8711
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Abstract
We analyse the spectra of the archival XMM-Newton data of the Seyfert 1 AGN Zw 229.015 in the energy range 0.3-10.0 keV. When fitted with a simple power law, the spectrum shows signatures of weak soft excess below 1.0 keV. We find that both thermal Comptonization and relativistically blurred reflection models provide the most acceptable spectral fits with plausible physical explanations to the origin of the soft excess than do multicolour disc blackbody and smeared wind absorption models. This motivated us to study the variability properties of the soft and the hard X-ray emissions from the source and the relationship between them to put further constraints on the above models. Our analysis reveals that the variation in the 3.0-10.0 keV band lags that in the 0.3-1.0 keV by 600+−290280 s, while the lag between the 1.0-10.0 keV and 0.3-1.0 keV is 980+−500500 s. This implies that the X-ray emissions are possibly emanating from different regions within the system. From these values, we estimate the X-ray emission region to be within 20Rg of the central supermassive black hole (where Rg = GM/c2, M is the mass of black hole, G Newton's gravitational constant and c the speed of light). Furthermore, we use XMM-Newton and Kepler photometric light curves of the source to search for possible non-linear signature in the flux variability. We find evidence that the variability in the system may be dominated by stochasticity rather than deterministic chaos which has implications for the dynamics of the accretion system.
| Item Type: | Journal Article |
|---|---|
| Publication: | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Oxford University Press |
| Additional Information: | The copyright of this article belongs to the authors. |
| Keywords: | Galaxies: active; Galaxies: individual: Zw 229.015; Galaxies: Seyfert; X-rays: galaxies |
| Department/Centre: | Division of Physical & Mathematical Sciences > Astronomy and Astrophysics Programme |
| Date Deposited: | 02 Jun 2022 06:29 |
| Last Modified: | 02 Jun 2022 06:29 |
| URI: | https://eprints.iisc.ac.in/id/eprint/73061 |
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