تقرير
Revisiting the Continuum Reverberation Lags in the AGN PKS 0558-504
| العنوان: | Revisiting the Continuum Reverberation Lags in the AGN PKS 0558-504 |
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| المؤلفون: | González-Buitrago, D. H., Santisteban, J. V. Hernández, Barth, A. J., Jimenez-Bailón, E., Li, Yan-Rong, García-Díaz, Ma. T., Vargas, A. Lopez, Herrera-Endoqui, M. |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | We present a revised analysis of the photometric reverberation mapping campaign of the narrow-line Seyfert 1 galaxy PKS 0558-504 carried out with the Swift Observatory during 2008--2010. Previously, Gliozzi et al.\ found using the Discrete Correlation Function (DCF) method that the short-wavelength continuum variations lagged behind variations at longer wavelengths, the opposite of the trend expected for thermal reprocessing of X-rays by the accretion disc, and they interpreted their results as evidence against the reprocessing model. We carried out new DCF measurements that demonstrate that the inverted lag-wavelength relationship found by Gliozzi et al.\ resulted from their having interchanged the order of the driving and responding light curves when measuring the lags. To determine the inter-band lags and uncertainties more accurately, we carried out new measurements with four independent methods. These give consistent results showing time delays increasing as a function of wavelength, as expected for the disc reprocessing scenario. The slope of the re-analysed delay spectrum appears to be roughly compatible with the predicted $\tau \propto \lambda^{4/3}$ relationship for reprocessing by an optically thick and geometrically thin accretion disc, although the data points exhibit a large scatter about the fitted power-law trend. Comment: 12 pages, 7 figures, 2 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stac1945 |
| URL الوصول: | http://arxiv.org/abs/2207.02474 |
| رقم الأكسشن: | edsarx.2207.02474 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stac1945 |
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