International Ultraviolet Explorer (IUE) observations of the Seyfert 1 galaxies I ZW 1, II ZW 136, and MK 231

Details International Ultraviolet Explorer (IUE) observations of the Seyfert 1 galaxies I ZW 1, II ZW 136, and MK 231 International Ultraviolet Explorer (IUE) observations of the Seyfert 1 galaxies I ZW 1, II ZW 136, and MK 231

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157..279s&link_type=abstract

The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited

Astronomy and Astrophysics

Astronomy

16

Iue, Seyfert Galaxies, Ultraviolet Astronomy, Absorption Spectra, Atomic Collisions, Atomic Excitations, Emission Spectra, Interstellar Extinction, Iron, Lyman Alpha Radiation, Magnesium, Silicon

Scientific paper

Repeated observations of the Seyfert 1 galaxies I Zw 1, II Zw 136 and Mk 231, which all have very strong Fe II emission lines in the optical region, were made at low resolution with the International Ultraviolet Explorer satellite. The ultraviolet spectra of I Zw 1 and II 2w 136 are very similar: both are variable and show broad emmission features of Fe II (especially the UV multiplets 1, 33, 60, 62 and 63) as well as the emission lines usually strong in Seyferts and quasars e.g., Lyman alpha, Mg II, C III, C IV and N V. Nk 231 has a completely different ultraviolet spectrum : there is no evidence for variability and only low ionization lines of Mg II, Fe II and Lyman alpha are present both in emission and absorption; the strongest absorption lines all belong to the Z = 0.043 system, which is probably of stellar origin. The data strongly support the hypothesis that the optical Fe II emission lines are primarily due to collisional excitation and that resonance fluorescence makes only a minor contribution to the excitation of these lines.

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