- UV Continuum Variability as a Probe of AGN Physics

Details - UV Continuum Variability as a Probe of AGN Physics - UV Continuum Variability as a Probe of AGN Physics

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6721w&link_type=abstract

HST Proposal ID #6721

Physics

Hst Proposal Id #6721 Agn

Scientific paper

We will use the FOS in RAPID mode with the G160L and PRISMdispersers to obtain high--speed (90s time resolution),exactly simultaneous UV through optical spectrophotometry ofthe rapid variations in the Seyfert galaxy NGC7469. Our goalsare to determine the time delay between the UV & opticalcontinua, to detect a high--frequency cutoff in the powerspectrum, to determine the wavelength dependency of the rapidvariations, and to determine if the spectrum of the flickeringis timescale--dependent. AGN continuum models make differentpredictions about the correlation between the UV & opticalvariations and therefore are easily distinguished, providedthe variations are resolved. Previous observations of Seyfertsshow variability on very short timescales (<<1 day), but theirtime resolution was too poor to fully resolve the fluctuationsand place tight limits on the UV--optical delay. Because ourtime resolution will extend beyond the limit of the fastesttheoretically expected variations, we will be able to placeextremely powerful constraints on the physical conditions inthe AGN continuum--producing region. We will coordinate ourobservations with the AGN Watch IUE+XTE Campaign alreadyscheduled to observe NGC7469, giving simultaneous X-raycoverage. This will allow us to extend our UV--opticalanalysis into the hard X-rays. We will have two orders ofmagnitude finer time resolution than IUE.

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