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An analysis of the ...
An analysis of the spectra of 3 Seyfert-1 galaxies with strong Ca II emission
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van Groningen, E. (författare)
- 1993
- 1993
- Engelska.
-
Ingår i: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 272:1, s. 25-3636
- Relaterad länk:
-
https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- 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
- ref (ämneskategori)
- art (ämneskategori)
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