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Broad emission line variability in the Seyfert 1 galaxies NGC 5548 and NGC 3783
1988 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 200, no 1-2, 9-1616 p.Article in journal (Refereed) Published
Abstract [en]

High quality spectra are presented for the Seyfert 1 galaxies NGC 5548 and NGC 3783. Halpha and Hbeta were observed at different epochs, with time intervals between 4 and 13 months. The spectra have been scaled to each other by normalizing the flux of the narrow lines. The difference spectra show that the broad emission lines have varied not only in flux, but also in shape. The authors compare their data with those published by Peterson (1987) and Peterson et al. (1987) and conclude that the supermassive binary scenario proposed by the latter is not unique. The observed variations can be interpreted in an accretion disk scenario. The whole data-set also provides evidence against models based on outflowing motion. The He II lambda4686 line discussed together with N III lambda4640 Bowen emission. A limit to the results is given by the long time intervals separating the observations, which do not allow the authors to set as strong constraints on the BLR as high quality, frequent monitoring of Seyfert 1 spectra would

Place, publisher, year, edition, pages
1988. Vol. 200, no 1-2, 9-1616 p.
Keyword [en]
Experimental/ astronomical spectra, Seyfert galaxies, visible astronomical observations/ AD 1985 to 1986, visible, Seyfert 1 galaxies, NGC 5548, NGC 3783, spectra, Halpha, Hbeta, broad emission lines, flux, shape, supermassive binary scenario, accretion disk scenario, outflowing motion, He II, N III, Bowen emission, 468.6 nm, 464 nm, N, He, H/ A9580J Photographic region astronomical observations A9850E Galactic structure, content and morphology A9850R Active and peculiar galaxies/ wavelength 4.686E-07 m, wavelength 4.64E-07 m/ N/el, He/el, H/el
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-197181ISI: 3220421OAI: oai:DiVA.org:uu-197181DiVA: diva2:611966
Available from: 2013-03-19 Created: 2013-03-18 Last updated: 2013-03-19

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