2018
DOI: 10.1093/mnras/sty1983
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Abstract: 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 … Show more

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Cited by 95 publications
(136 citation statements)
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“…4). Such lags favor the X-ray reprocessing scenario at accretion disk and have been reported in many AGNs where UV is found to be lagging behind X-ray emission as expected in the reprocessing scenario (e.g., Buisson et al 2017;McHardy et al 2014McHardy et al , 2018. Additional support for this comes from the general variability trend of OJ 287 where multi-wavelength variations are normally simultaneous on short timescales (Kushwaha et al 2018a(Kushwaha et al , 2013 with lag reported only when an additional emission component was competing with its general emission (Kushwaha et al 2018b).…”
Section: Radio-quiet Agn/disk Based Modelsmentioning
confidence: 61%
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“…4). Such lags favor the X-ray reprocessing scenario at accretion disk and have been reported in many AGNs where UV is found to be lagging behind X-ray emission as expected in the reprocessing scenario (e.g., Buisson et al 2017;McHardy et al 2014McHardy et al , 2018. Additional support for this comes from the general variability trend of OJ 287 where multi-wavelength variations are normally simultaneous on short timescales (Kushwaha et al 2018a(Kushwaha et al , 2013 with lag reported only when an additional emission component was competing with its general emission (Kushwaha et al 2018b).…”
Section: Radio-quiet Agn/disk Based Modelsmentioning
confidence: 61%
“…3(b)). In this scenario, a likely possibility is that the disk may be illuminated by the base of the jet McHardy et al 2014McHardy et al , 2018. We found clear indications of lagging of UVW1 band emission with respect to the hard X-ray emission (∼ 3 and ∼ 16 days, see Fig.…”
Section: Radio-quiet Agn/disk Based Modelsmentioning
confidence: 72%
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“…Variations in different bands are well coordinated. Changes of short-wavelength emission lead those of long-wavelength emission (e.g., Sergeev et al 2005;Fausnaugh et al 2016;Jiang et al 2017;Homayouni et al 2019;Cackett et al 2018;Kokubo 2018;McHardy et al 2018;Mudd et al 2018;Yu et al 2018;Edelson et al 2019). Current observations have a broad diversity of measured time lags beyond the SSD theory: some AGNs have time lags that are about three times larger than the flux-weighted light-travel time delays of the SSD theory.…”
Section: Agn Uv/optical Fractional Variability Amplitude In-mentioning
confidence: 98%
“…Low spin (also low accretion rate and large BH mass) may lead to the deficit of the UV photons and nonlinear relation between L ion and L 5100 (Wang et al 2014b;Czerny et al 2019). And the L 5100 variation shows a little lag with respect to the L ion variation in the RM of accretion disks (Edelson et al 2015;McHardy et al 2018;Cackett et al 2018, e.g.,). About Condition (3), the size of accretion disk, although small, has been successfully measured and is not infinitesimal (Edelson et al 2015;McHardy et al 2018;Cackett et al 2018).…”
Section: Introductionmentioning
confidence: 99%