X-ray/UV/optical variability of NGC 4593 with Swift: Reprocessing of X-rays by an extended reprocessor
| Autor: | Elmé Breedt, Bradley M. Peterson, S. Connolly, I. M. McHardy, Shai Kaspi, Kirk T. Korista, P. Arévalo, Mayukh Pahari, Martin Ward, Gulab C. Dewangan, Martin Elvis, Phil Uttley, Christopher S. Kochanek, Chris Done, N. Gehrels, Hum Chand, P. Lira, Dimitrios Emmanoulopoulos, N. Brandt, Edward M. Cackett, J. M. Gelbord, Marianne Vestergaard, A. R. Rao, Michael Fausnaugh, M. R. Goad, I. E. Papadakis, Ranieri D. Baldi, Keith Horne |
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| Přispěvatelé: | Science & Technology Facilities Council, University of St Andrews. School of Physics and Astronomy, High Energy Astrophys. & Astropart. Phys (API, FNWI) |
| Rok vydání: | 2017 |
| Předmět: |
individual: NGC4593 [Galaxies]
Seyfert [Galaxies] Active galactic nucleus active [Galaxies] FOS: Physical sciences Astrophysics 01 natural sciences symbols.namesake 0103 physical sciences QB Astronomy 010303 astronomy & astrophysics Wavelength band QC QB Physics High Energy Astrophysical Phenomena (astro-ph.HE) 010308 nuclear & particles physics Scattering X-ray Balmer series Astronomy and Astrophysics 3rd-DAS Light curve Galaxy galaxies [Ultraviolet] galaxies [X-rays] QC Physics Space and Planetary Science Reprocessor symbols Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Monthly notices of the Royal Astronomical Society, 2018, Vol.480(3), pp.2881-2897 [Peer Reviewed Journal] Monthly Notices of the Royal Astronomical Society, 480(3), 2881-2897. Oxford University Press |
| ISSN: | 0035-8711 |
| DOI: | 10.48550/arxiv.1712.04852 |
| Popis: | We report the results of intensive X-ray, UV and optical monitoring of the Seyfert 1 galaxy NGC 4593 with Swift. There is no intrinsic flux-related spectral change in the the variable components in any band with small apparent variations due only to contamination by a second constant component, possibly a (hard) reflection component in the X-rays and the (red) host galaxy in the UV/optical bands. Relative to the shortest wavelength band, UVW2, the lags of the other UV and optical bands are mostly in agreement with the predictions of reprocessing of high energy emission from an accretion disc. The U-band lag is, however, far larger than expected, almost certainly because of reprocessed Balmer continuum emission from the more distant broad line region gas. The UVW2 band is well correlated with the X-rays but lags by ~6x more than expected if the UVW2 results from reprocessing of X-rays on the accretion disc. However, if the lightcurves are filtered to remove variations on timescales >5d, the lag approaches the expectation from disc reprocessing. MEMEcho analysis shows that direct X-rays can be the driver of most of the variations in the UV/optical bands as long as the response functions for those bands all have long tails (up to 10d) in addition to a strong peak (from disc reprocessing) at short lag ( 18 pages, 17 figures. Submitted to Monthly Notices of the Royal Astronomical Society |
| Databáze: | OpenAIRE |
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