An analysis of the spectra of 3 Seyfert-1 galaxies with strong Ca II emission
1993 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 272, no 1, 25-3636 p.Article in journal (Refereed) Published
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 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; 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)
Place, publisher, year, edition, pages
1993. Vol. 272, no 1, 25-3636 p.
Experimental/ astronomical spectra, galactic nuclei, Markarian galaxies, red shift, Seyfert galaxies, visible astronomical observations/ galaxies optical spectra, visible, near-IR, forbidden Ca II lines, Markarian 231, Ca II IR triplet, emission lines velocity widths, AD 1982 10 to 1988 09, Fe II lines, emission lines blueshift, galaxies redshifts, Seyfert-1 galaxies, strong Ca II emission, I Zw 1, Akn 564, Mkn 231, optical wavelength region, Ca II triplet lines, column densities, line emitting region, electron scattering, thermal electrons, broad line clouds, emission line regions, broad line region, kinematically separated narrow line regions, high excitation region, systemic velocity, 351 to 948 nm, 1100 km/s, 400 km/s, -700 km/s, 849.8 to 866.2 nm, 729.1 to 732.5 nm, galaxies Ca + emission lines, Fe + lines / A9850R Active and peculiar galaxies A9850G Radiation and spectra of galaxies A9850E Galactic structure, content and morphology A9580J Photographic region astronomical observations A9850H Red shift, distances, and spatial distribution of galaxies/ wavelength 3.51E-07 to 9.48E-07 m, velocity 1.1E+06 m/s, velocity 4.0E+05 m/s, velocity -7.0E+05 m/s, wavelength 8.498E-07 to 8.662E-07 m, wavelength 7.291E-07 to 7.325E-07 m/ Ca/el, Fe/el
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-197171ISI: 4438253OAI: oai:DiVA.org:uu-197171DiVA: diva2:611951