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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
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1991 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 366, no 1, 64-8181 p.Article in journal (Refereed) Published
Abstract [en]

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

Place, publisher, year, edition, pages
1991. Vol. 366, no 1, 64-8181 p.
Keyword [en]
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
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-197176DOI: 10.1086/169540ISI: 3834155OAI: oai:DiVA.org:uu-197176DiVA: diva2:611962
Available from: 2013-03-19 Created: 2013-03-18 Last updated: 2013-03-19

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