An analysis of the spectra of 3 Seyfert-1 galaxies with strong Ca II emission

• 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)

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

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

Publikations- och innehållstyp

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