Publication: A Spectroscopic and Photometric Study of Short-Timescale Variability in NGC 5548
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2001
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Dietrich, M., C. F. Bender, D. J. Bergmann, T. E. Bills, N. G. Bochkarev, A. Burenkov, C. M. Gaskell, D. D. Gutzmer, R. Grove, M. E. Hiller, John P. Huchra, E. S. Klimek, C. Lund, N. Merkulova, S. Pebley, M. A. Poulsen, V. I. Pronik, S. G. Sergeev, E. A. Sergeeva, A. I. Shapovalova, V. V. Vlasyuk, and Belinda Wilkes. 2001. A spectroscopic photometric study of short-timescale variability in NGC 5548. Astronomy and Astrophysics 371: 79-92.
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Abstract
Results of a ground-based optical monitoring campaign on NGC 5548 in June 1998 are presented. The broad-band fluxes (U, B, V), and the spectrophotometric optical continuum flux F wavelength (5100 Å) monotonically decreased in flux while the broad-band R and I fluxes and the integrated emission-line fluxes of H alpha and H beta remained constant to within 5% . On June 22, a short continuum flare was detected in the broad band fluxes. It had an amplitude of about ~18% and it lasted only ~ 90 min. The broad band fluxes and the optical continuum F wavelength (5100 Å) appear to vary simultaneously with the EUV variations. No reliable delay was detected for the broad optical emission lines in response to the EUVE variations. Narrow H beta emission features predicted as a signature of an accretion disk were not detected during this campaign. However, there is marginal evidence for a faint feature at wavelength ~ 4962Åwith FWHM ~ 6 Åredshifted by delta v 1100kms-1 km s-1 with respect to H beta (narrow).
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