Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0404c&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #04.04; Bulletin of the American Astronomical Society, Vol. 25, p.790
Other
Scientific paper
Ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 have been obtained with the Faint Object Spectrograph (FOS) on the Hubble Space Telescope. The observations were made at a time when the UV continuum and broad emission lines were at their lowest ever observed level. The high resolution of the spectra (R = 1000), and the low continuum and broad-line flux levels allow for a clean separation of the broad and narrow components of Lalpha , C IV lambda 1549, and C III] lambda 1909. Relative to the other UV narrow lines, C IV is much stronger in NGC 5548 than in Seyfert 2 galaxies observed with IUE, which indicates that the average ionization parameter is higher in the narrow-line region (NLR) of NGC 5548. The narrow component of Mg II lambda 2798 is very weak in NGC 5548, which suggests that the NLR clouds are fully ionized and lack substantial ``transition zones'' that produce the majority of this line in Seyfert 2 galaxies. Thus, it appears the the NLR clouds in NGC 5548 experience a higher level of ionizing flux, on average, than those in Seyfert 2 galaxies.
Boggess Albert
Crenshaw Michael D.
Wu Congjun
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