Observations shed more light on the properties of the galaxy Markarian 817 arxiv
The AGN STORM 2 campaign is a large, multiwavelength reverberation mapping project designed to trace out the structure of Mrk 817 from the inner accretion disk to the broad emission line region and out to the dusty torus. As part of this campaign, Swift performed daily monitoring of Mrk 817 for approximately 15 months, obtaining observations in X-rays and six UV/optical filters.
Combining the Swift UV/optical light curves with Hubble UV continuum light curves, we measure interband continuum lags, $\tau$, that increase with increasing wavelength roughly following $\tau \propto \lambda^{4/3}$, the dependence expected for a geometrically thin, optically thick, centrally illuminated disk.
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