Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-07-03
Astronomy and Astrophysics
Astrophysics
27 pages, 14 figures. Accepted by Astrophysical Journal
Scientific paper
10.1086/323234
We present results of an intensive two-month campaign of approximately daily spectrophotometric monitoring of the narrow-line Seyfert 1 galaxy Akn 564 with HST. The fractional variability amplitude of the continuum variations between 1365-3000 A is ~6%, about a factor 3 less than that found in typical Seyfert 1 galaxies over a similar period of time. However, large amplitude, short time-scale flaring behavior is evident, with trough-to-peak flux changes of about 18% in approximately 3 days. We present evidence for wavelength-dependent continuum time delays, with the variations at 3000 A lagging behind those at 1365 A by about 1 day. These delays may be interpreted as evidence for a stratified continuum reprocessing region, possibly an accretion-disk structure. The Lyman-alpha 1216 emission-line exhibits flux variations of about 1% amplitude.
Brandt Wiliam N.
Clavel Jean
Collier Stefan
Crenshaw Michael D.
Edelson Richard
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