Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...272...25v&link_type=abstract
Astronomy and Astrophysics, Vol.272, NO. 1/MAYI, P. 25, 1993
Astronomy and Astrophysics
Astrophysics
12
Scientific paper
High resolution spectroscopy is presented of three Seyfert-1 galaxies - I Zw 1, Akn 564 and Mkn 231. The spectra cover the optical wavelength region and the regions with the Ca II triplet and the [Ca II] lines. The broad lines in I Zw 1 and Akn 564 are relatively narrow (FWHM < 1000 km s^-1^), and it is found that in both objects the Ca II triplet lines are considerably broader than the Balmer lines. These lines are formed at large column densities in the line emitting region, and it is demonstrated that electron scattering by thermal electrons in the broad line clouds may explain the larger widths of the Ca II lines. I Zw 1 has three emission line regions - in addition to the broad line region there are two kinematically separated narrow line regions - a high excitation region with relatively broad lines (FWHM ~ 1100 km s^-1^), blue shifted with regard to the systemic velocity by ~700 km s^-1^,and a region with very low excitation at the systemic velocity and much narrower lines (FWHM ~ 400 km s^-1^). The few diagnostic lines available for this region indicate an extremely high density (n_H_~ 10^8^ cm^-3^) and a low ionization parameter (log U_1_ < - 3.5). The Fe II lines in the optical part of the I Zw 1 spectrum are analysed in detail. Multiplets 35 and 36 are definitely present in emission, but m25 is absent, implying that the latter has no influence on the Hβ profile.
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