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07 February 2025
 
  » arxiv » astro-ph/0107059

 Article overview



Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Akn 564. II. Ultraviolet Continuum and Emission-line Variability
S. Collier ; D.M. Crenshaw ; B.M. Peterson ; W.N. Brandt ; J. Clavel ; R. Edelson ; I.M. George ; K. Horne ; G.A. Kriss ; S. Mathur ; H. Netzer ; P.T. O’Brien ; R.W. Pogge ; K.A. Pounds ; P. Romano ; O. Shemmer ; T.J. Turner ; W. Wamsteker ;
Date 3 Jul 2001
Subject astro-ph
AbstractWe 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.
Source arXiv, astro-ph/0107059
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