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dc.contributor.authorVincentelli, F M
dc.contributor.authorMcHardy, I
dc.contributor.authorSantisteban, J V Hernández
dc.contributor.authorCackett, E M
dc.contributor.authorGelbord, J
dc.contributor.authorHorne, Keith
dc.contributor.authorMiller, J A
dc.contributor.authorLobban, A
dc.identifier.citationVincentelli , 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 .
dc.identifier.otherJisc: e0f2bb6574f745fc95d7ff1a70313aee
dc.identifier.otherORCID: /0000-0002-6733-5556/work/108919214
dc.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.en
dc.description.abstractWe 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.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society: Lettersen
dc.subjectGalaxies: activeen
dc.subjectGalaxies: individual: Mrk 110en
dc.subjectAccretion discsen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleThe luminosity-dependent contribution from the broad line region to the wavelength-dependent lags in Mrk 110en
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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