On the multi-wavelength variability of Mrk 110 : two components acting at different timescales
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We present the first intensive continuum reverberation mapping study of the high accretion-rate Seyfert galaxy Mrk 110. The source was monitored almost daily for more than 200 days with the Swift X-ray and UV/optical telescopes, supported by ground-based observations from Las Cumbres Observatory, the Liverpool Telescope, and the Zowada Observatory, thus extending the wavelength coverage to 9100 Å. Mrk 110 was found to be significantly variable at all wavebands. Analysis of the intraband lags reveals two different behaviours, depending on the timescale. On timescales shorter than 10 days the lags, relative to the shortest UV waveband (∼1928 Å), increase with increasing wavelength up to a maximum of ∼2d lag for the longest waveband (∼9100 Å), consistent with the expectation from disc reverberation. On longer timescales, however, the g-band lags the Swift BAT hard X-rays by ∼10 days, with the z-band lagging the g-band by a similar amount, which cannot be explained in terms of simple reprocessing from the accretion disc. We interpret this result as an interplay between the emission from the accretion disc and diffuse continuum radiation from the broad line region.
Vincentelli , F M , McHardy , I , Cackett , E M , Barth , A J , Horne , K , Goad , M , Korista , K , Gelbord , J , Brandt , W , Edelson , R , Miller , J A , Pahari , M , Peterson , B M , Schmidt , T , Baldi , R D , Breedt , E , Santisteban , J V H , Romero-Colmenero , E , Ward , M & Williams , D R A 2021 , ' On the multi-wavelength variability of Mrk 110 : two components acting at different timescales ' , Monthly Notices of the Royal Astronomical Society . https://doi.org/10.1093/mnras/stab1033
Monthly Notices of the Royal Astronomical Society
Copyright © 2021 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/mnras/stab1033.
DescriptionFunding: F.M.V. and I.M.H. acknowledge support from STFC under grant ST/R000638/1. KH and JVHS acknowledge support from STFC grant ST/R000824/1.
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