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publication

Simultaneous multifrequency observations of the Seyfert 1 galaxy NGC4051: Constant optical-infrared emission observed during large-amplitude X-ray variability

C. Done, M. Ward, A. Fabian, H. Kunieda, S. Tsuruta, A. Lawrence, M. Smith, and W. Wamsteker

Abstract

Simultaneous infrared, optical, ultraviolet, and X-ray observations of the low-luminosity Seyfert 1 galaxy, NGC 4051 are reported. A new method of reduction was developed to correct the optical flux for atmospheric variations due to seeing and extinction. The X-ray flux varied by factors of up to 2 on time-scales of tens of minutes, while the optical flux remained steady to within 1 percent. The results rule out all models, including Compton scattering and synchrotron models, in which a single electron population is responsible for the formation of both the infrared-to-optical and the X-ray spectra. The optical emission region must be an order of magnitude larger than, or completely separate from, the X-ray source.

 
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