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Intensive Spectroscopic Monitoring of NGC 5548 with HST and IUE

Published online by Cambridge University Press:  19 July 2016

B.M. Peterson  and
K.T. Korista
B.M. Peterson
Affiliation:
Department of Astronomy, The Ohio State University, Columbus, Ohio, USA
K.T. Korista
Affiliation:
Space Telescope Science Institute, Baltimore, Maryland, USA

Abstract

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We present preliminary results on a combined HST/IUE/ground-based monitoring campaign on the Seyfert 1 galaxy NGC 5548 undertaken by the International AGN Watch in order to answer questions that require both high temporal resolution (one day) and high signal-to-noise ratios. Our preliminary conclusions are (1) the ultraviolet and optical continuum variations are simultaneous to within a day (2) the He II λ1640 variations lag behind the continuum by about 1.7 days, and (3) the velocity field of the C IV-emitting region is not characterized by bulk by radial motion, but the higher velocity gas seems to originate closer to the continuum source than the lower velocity gas.

Keywords

Spectroscopyvariabilitymultiwavelength observations
Type
Variability
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 177 - 180
Copyright
Copyright © Kluwer 1994 

References

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