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Dust reverberation mapping of Z229–15

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dc.contributor.author Mandal, A. K
dc.contributor.author Rakshit, S
dc.contributor.author Stalin, C. S
dc.contributor.author Wylezalek, D
dc.contributor.author Patig, M. K
dc.contributor.author Sagar, R
dc.contributor.author Mathew, B
dc.contributor.author Muneer, S
dc.contributor.author Pal, I
dc.date.accessioned 2021-02-14T06:02:18Z
dc.date.available 2021-02-14T06:02:18Z
dc.date.issued 2021-03
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 501, No. 3, pp. 3905–3915 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://hdl.handle.net/2248/7625
dc.description Restricted Access © The Royal Astronomical Society https://doi.org/10.1093/mnras/staa3828 en_US
dc.description.abstract We report results of the dust reverberation mapping (DRM) on the Seyfert 1 galaxy Z229–15 at z = 0.0273. Quasi-simultaneous photometric observations for a total of 48 epochs were acquired during the period 2017 July to 2018 December in B, V, J, H and Ks bands. The calculated spectral index (α) between B and V bands for each epoch was used to correct for the accretion disc (AD) component present in the infrared light curves. The observed α ranges between −0.99 and 1.03. Using cross-correlation function analysis we found significant time delays between the optical V and the AD corrected J, H and Ks light curves. The lags in the rest frame of the source are 12.52+10.00 −9.55 d (between V and J), 15.63+5.05 −5.11 d (between V and H) and 20.36+5.82 −5.68 d (between V and Ks). Given the large error bars, these lags are consistent with each other. However, considering the lag between V and Ks bands to represent the inner edge of the dust torus, the torus in Z229–15 lies at a distance of 0.017 pc from the central ionizing continuum. This is smaller than that expected from the radius luminosity (R−L) relationship known from DRM. Using a constant α = 0.1 to account for the AD component, as is normally done in DRM, the deduced radius (0.025 pc) lies close to the expected R−L relation. However, usage of constant α in DRM is disfavoured as the α of the ionizing continuum changes with the flux of the source en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject galaxies: active en_US
dc.subject galaxies: individual: Z229-15 en_US
dc.subject galaxies: Seyfert en_US
dc.title Dust reverberation mapping of Z229–15 en_US
dc.type Article en_US

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