IUE and visual spectrophotometry of Markarian 9, Markarian 10, and 3C 390.3

Details IUE and visual spectrophotometry of Markarian 9, Markarian 10, and 3C 390.3 IUE and visual spectrophotometry of Markarian 9, Markarian 10, and 3C 390.3

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..445o&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 15, 1981, p. 445-452.

Astronomy and Astrophysics

Astrophysics

28

Astronomical Photometry, Interstellar Extinction, Line Spectra, Seyfert Galaxies, Ultraviolet Spectra, Visual Photometry, Continuous Spectra, Cosmic Dust, H Alpha Line, H Beta Line, Iue, Lyman Spectra, Photoionization, Quasars, Spectrophotometry

Scientific paper

Ultraviolet spectra from IUE are combined with visual spectra for the three type I Seyfert galaxies Mrk 9, Mrk 10, and 3C 390.3. The 2175 A interstellar feature is measured well enough in Mrk 9 to indicate that the extinction corresponding to E(B-V) = 0.14 + or - 0.04 is in the galaxy. Mrk 10 displays evidence for 2175 A absorption and also yields E(B-V) = 0.14 + or - 0.07, while the continuum for 3C 390.3 is too weak to positively detect the feature. It is found, after correcting for reddening, that the line-intensity ratio L(alpha)/H(beta) ranges from 8 to 18, while that for H(alpha)/H(beta) goes from 2.1 to 5.4. It is noted that the He II 1640/4686 line ratio is uncertain but appears to be consistent with the recombination value of about 8. If photoionization is assumed, a comparison of the strengths of L(alpha) and H(beta) with the UV ionizing flux suggests that H(beta) is enhanced rather than L(alpha) depressed. When a comparison is made with similar ratios in quasars, L(alpha) is found to be much stronger and H(beta) slightly stronger in Seyferts than in quasars.

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