Multiwavelength Monitoring of the Narrow‐Line Seyfert 1 Galaxy Arakelian 564. II. Ultraviolet Continuum and Emission‐Line Variability | Zendy

S. Collier | Zendy; D. M. Crenshaw | Zendy; B. M. Peterson | Zendy; W. N. Brandt | Zendy; J. Clavel | Zendy; Rick Edelson | Zendy; I. M. George | Zendy; K. Horne | Zendy; G. A. Kriss | Zendy; S. Mathur | Zendy; H. Netzer | Zendy; P. T. O’Brien | Zendy; Richard W. Pogge | Zendy; K. A. Pounds | Zendy; P. Romano | Zendy; Ohad Shemmer | Zendy; T. J. Turner | Zendy; W. Wamsteker | Zendy

Open Access

Multiwavelength Monitoring of the Narrow‐Line Seyfert 1 Galaxy Arakelian 564. II. Ultraviolet Continuum and Emission‐Line Variability

Author(s) -

S. Collier,

D. M. Crenshaw,

B. M. Peterson,

W. N. Brandt,

J. Clavel,

Rick Edelson,

I. M. George,

K. Horne,

G. A. Kriss,

S. Mathur,

H. Netzer,

P. T. O’Brien,

Richard W. Pogge,

K. A. Pounds,

P. Romano,

Ohad Shemmer,

T. J. Turner,

W. Wamsteker

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/323234

Subject(s) - physics , astrophysics , amplitude , galaxy , eddington luminosity , black hole (networking) , virial theorem , emission spectrum , virial mass , flux (metallurgy) , astronomy , luminosity , spectral line , optics , computer network , routing protocol , routing (electronic design automation) , materials science , computer science , metallurgy , link state routing protocol

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.

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