The spectrum of III ZW 77 - an unusual, high-ionization Seyfert 1 galaxy

Details The spectrum of III ZW 77 - an unusual, high-ionization Seyfert 1 galaxy The spectrum of III ZW 77 - an unusual, high-ionization Seyfert 1 galaxy

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..696o&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, June 15, 1981, p. 696-707. Research supported by the University of California

Astronomy and Astrophysics

Astrophysics

99

Astronomical Photometry, Emission Spectra, Galactic Radiation, Line Spectra, Seyfert Galaxies, Astronomical Spectroscopy, Continuous Spectra, H Lines, Helium, Iron, Oxygen, Red Shift, Resonance Lines, Spectral Line Width

Scientific paper

An observational study is conducted of the spectrum of III Zw 77. Spectral data were obtained of the galaxy with the image-tube image-dissector scanner developed by Robinson and Wampler (1972) and the Cassegrain spectrograph and peripherals developed to match it by Miller et al. (1976), on the 3 m Shane telescope of the Lick Observatory. It appears that most of the observed spectral features observed and measured in III Zw 77 can be understood on the basis of photoionization by a featureless continuum extending to high energies, well over 300 eV at least. The most likely interpretation is that the internal reddening is small and that the temperature in the regions that produce most of the stronger, narrow emission lines is of order T approximately 25,000 K. There is a general decrease in internal velocity dispersion from lines of high ionization to low, probably indicating a decrease of velocity dispersion with increasing distance from the ionization source.

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