Variability of the optical spectrum of NGC 5548 and evidence for a multiple-component broad-line region

Details Variability of the optical spectrum of NGC 5548 and evidence for a multiple-component broad-line region Variability of the optical spectrum of NGC 5548 and evidence for a multiple-component broad-line region

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312...79p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 1, 1987, p. 79-90.

Astronomy and Astrophysics

Astrophysics

63

Astronomical Photometry, Balmer Series, Galactic Radiation, Seyfert Galaxies, Spectrophotometry, Continuous Spectra, Galactic Structure, H Beta Line, Line Spectra, Molecular Clouds

Scientific paper

In an attempt to determine the kinematics of the broad-line region in the Seyfert 1 galaxy NGC 5548, optical spectra have been obtained since 1980 to search for continuum flux, broad-line flux, and broad-line profile variability. The continuum and Balmer-line fluxes vary in a correlated fashion, with some evidence for a small time delay between them. The size of the broad-line region is estimated to be of order 30 light days, although this is rather uncertain. Over a five-month period in 1984, the continuum and Balmer-line fluxes increased without any change in the line profile. From this observation, it is concluded that broad-line cloud velocities are independent of position in the line-emitting region. Additional broad-line components were detected throughout 1985, and it is argued that these components arise in a region physically distinct from the rest of the broad-line region.

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