Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389..196o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 10, 1992, p. 196-207.
Astronomy and Astrophysics
Astronomy
83
Active Galactic Nuclei, Emission Spectra, Infrared Sources (Astronomy), Infrared Spectra, Seyfert Galaxies, Sky Surveys (Astronomy), Charge Coupled Devices, H Ii Regions, Infrared Astronomy, Near Infrared Radiation, Photoionization, Signal To Noise Ratios, Starburst Galaxies
Scientific paper
Observational results of a previous spectroscopic survey of Seyfert galaxies in the near-IR are presented, and the potential for using emission-line ratios in this spectral region as a classification diagnostic tool is examined. Near-IR CCD spectra, which cover the wavelength range of 7000-10,000 at a nominal resolution of about 12 A, of 15 additional Seyferts and two starburst galaxies are obtained. Relative emission-line intensities from these observations, in combination with measurements from previous studies and measurements of new, signal-to-noise ratio optical spectra of many of these objects, are used to study the diagnostic diagrams involving forbidden S III 9069, 9531/H-alpha, forbidden O II 7320, 7330/H-alpha, forbidden S II 6716, 6731/H-alpha, and forbidden O III 5007/H-beta. Comparisons are made in these diagrams between observational data from the active galaxies and published measurements of H II regionlike objects, as well as with predictions from simple one-component models calculated for the two types of objects.
Osterbrock Donald E.
Tran Hien D.
Veilleux Sylvain
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