Emission-line variations and broad-line region kinematics of NGC 5548

Details Emission-line variations and broad-line region kinematics of NGC 5548 Emission-line variations and broad-line region kinematics of NGC 5548

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..132r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 10, 1990, p. 132-148. Research supported by NASA.

Astronomy and Astrophysics

Astrophysics

16

Emission Spectra, Error Analysis, Seyfert Galaxies, Spectral Line Width, Astronomical Spectroscopy, Galactic Nuclei, H Lines, Variability

Scientific paper

Sixteen spectroscopic observations of the Seyfert galaxy NGC 5548 were made between March 1979 and June 1984 at Palomar and Steward Observatories. Broad-line flux variations correlated with nonstellar continuum changes were measured. H-beta, H-gamma, and He II 4686A all respond rapidly to continuum variations providing strong evidence for photoionization by a central continuum source. Additionally, H-beta profile variations have occurred during the 1900 day monitoring period. These profile variations also correlate with changes in the continuum, but lag behind by about 90 days or less. A kinematic model that incorporates radial outflow and an internal line opacity source is proposed to explain qualitatively the observed H-beta profile variations.

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