Other
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..145f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 145-160.
Other
22
Astronomical Spectroscopy, Line Spectra, Optical Emission Spectroscopy, Seyfert Galaxies, Ultraviolet Spectra, Visible Spectrum, Active Galactic Nuclei, Astronomical Models, Line Shape, Nebulae, Spectral Energy Distribution, Spectrum Analysis
Scientific paper
The high-ionization Seyfert I galaxy III Zw 77 has been simultaneously observed over the satellite ultraviolet to near-IR spectral regions. As in other AGN, the continuous energy distribution shows a roughly power-law decline across much of the optical region and a flatter-than-unity spectral index in the near-UV. The equivalent widths of the Balmer lines and Ly-alpha are very similar to those found in other AGN. The UV-to-optical emission-line spectrum for narrow lines is fairly similar to those deduced for Seyfert 2 galaxies. A surprising result is the detection of the semiforbidden O III 1661, 1666 A doublet with an intensity indicating high temperatures more suggestive of shock heating than photoionization equilibrium. An interpretation in terms of a multicomponent photoionized structure is proposed in which dense regions produce the UV lines and the lower density regions produce the optical lines.
Ferland Gary J.
Osterbrock Donald E.
No associations
LandOfFree
The ultraviolet and optical emission-line spectrum of III ZW 77 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The ultraviolet and optical emission-line spectrum of III ZW 77, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The ultraviolet and optical emission-line spectrum of III ZW 77 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-789572