Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. I. An 8 month campaign of monitoring NGC 5548 with IUE

The authors present emission-line and ultraviolet continuum observations of a type I Seyfert galaxy in which the time resolution is adequate for describing the character of variability. Using the IUE satellite, the nucleus of NGC 5548 was observed every 4 days for a period of 8 months. Its mean properties-continuum shape, line ratios-are not unusual for type I Seyfert galaxies, but it was found to be strongly variable. The ultraviolet continuum flux and broad emission line fluxes varied significantly, going through three large maxima and three deep minima. The great majority of all variations were well resolved in time. The data lend qualitative support to the view that photoionization by the nuclear continuum is responsible for driving the emission lines

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
Experimental/ astronomical spectra
galactic nuclei
Seyfert galaxies
ultraviolet astronomical observations/ UV
spectra
AD 1988 12 14 to 1989 08 07
broad-line region
active galactic nuclei
NGC 5548
IUE
emission-line
continuum
type I Seyfert galaxy
fluxes
photoionization
117 to 330 nm/ A9850R Active and peculiar galaxies A9580M Space ultraviolet astronomical observations A9850G Radiation and spectra of galaxies/ wavelength 1.17E-07 to 3.3E-07 m

In:Astrophysical Journal: American Astronomical Society366:1, s. 64-81810004-637X1538-4357

By the author/editor: Clavel, J.; Reichert, G. A.; Alloin, D.; Crenshaw, D. M.; Kriss, G.; Krolik, J. H.; show more...; Malkan, M. A.; Netzer, H.; Peterson, B. M.; Wamsteker, W.; Altamore, A.; Baribaud, T.; Barr, P.; Beck, S.; Binette, L.; Bromage, G. E.; Brosch, N.; Diaz, A. I.; Filippenko, A. V ...; Fricke, K.; Gaskell, C. M.; Giommi, P.; Glass, I. S.; Gondhalekar, P.; Hackney, R. L.; Halpern, J. P.; Hutter, D. J.; Jorsater, S.; Kinney, A. L.; Kollatschny, W.; Koratkar, A.; Korista, K. T.; Laor, A.; Lasota, J. P.; Leibowitz, E.; Maoz, D.; Martin, P. G.; Mazeh, T.; Meurs, E. J. A.; Nair, A. D.; O'Brien, P.; Pelat, D.; Perez, E.; Perola, G. C.; Ptak, R. L.; Rodriguez-Pascua ...; Rosenblatt, E. I ...; Sadun, A. C.; Santos-Lleo, M.; Shaw, R. A.; Smith, P. S.; Stirpe, G. M.; Stoner, R.; Sun, W. H.; Ulrich, M. -H; van Groningen, E ...; Zheng, W.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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