The luminosity-dependent contribution from the broad line region to the wavelength-dependent lags in Mrk 110
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We have measured the wavelength-dependent lags between the X-ray, UV and optical bands in the high accretion rate (L/LEdd≈40 per cent) Active Galactic Nucleus Mrk 110 during two intensive monitoring campaigns in February and September 2019. We divide the observations into three intervals with different X-ray luminosities. The first interval, already published in Vincentelli et al. (2021), has the lowest X-ray luminosity and did not exhibit the U-band excess positive lag, or the X-ray excess negative lag that is seen in most AGN. However, these excess lags are seen in the two subsequent intervals of higher X-ray luminosity. Although the data are limited, the excess lags appear to scale with X-ray luminosity. Our modelling shows that lags expected from reprocessing of X-rays by the accretion disc vary hardly at all with increasing luminosity. Therefore, as the U-band excess almost certainly arises from Balmer continuum emission from the broad line region (BLR), we attribute these lag changes to changes in the contribution from the BLR. The change is easily explained by the usual increase in the inner radius of the BLR with increasing ionising luminosity.
Vincentelli , F M , McHardy , I , Santisteban , J V H , Cackett , E M , Gelbord , J , Horne , K , Miller , J A & Lobban , A 2022 , ' The luminosity-dependent contribution from the broad line region to the wavelength-dependent lags in Mrk 110 ' , Monthly Notices of the Royal Astronomical Society: Letters , vol. Advance Article . https://doi.org/10.1093/mnrasl/slac009
Monthly Notices of the Royal Astronomical Society: Letters
Copyright © 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnrasl/slac009.
DescriptionFunding: FMV and IMH were supported for this work by the STFC grant ST/R000638/1. JVHS and KDH acknowledges support from STFC grant ST/R000824/1. EMC & JM gratefully acknowledge support from the NSF through grant AST-1909199.
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