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- W2072547438 abstract "view Abstract Citations (134) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A spectrophotometric classification of low-redshift quasars and active galactic nuclei. Steiner, J. E. Abstract A spectrometric classification for quasars and active galactic nuclei which is based on intrinsic properties is proposed. The objects are separated into three groups: Class A objects with Fe II, Class B objects without Fe II and with Balmer lines broader than forbidden lines, and Class C objects without Fe II and with Balmer lines and forbidden lines of the same width. The properties are studied using parameters such as line ratio, line width, luminosities, and radio and X-ray properties. It is found that the spectrophotometric classification scheme based on intrinsic properties is possible, while Class A objects may provide a useful constraint to the cosmological parameter q0. Publication: The Astrophysical Journal Pub Date: November 1981 DOI: 10.1086/159394 Bibcode: 1981ApJ...250..469S Keywords: Active Galactic Nuclei; Astronomical Photometry; Quasars; Red Shift; Spectrophotometry; Balmer Series; Cosmology; Emission Spectra; Galactic Structure; Iron; Metal Ions; Radio Spectra; Stellar Luminosity; X Ray Spectra; Astrophysics full text sources ADS | data products SIMBAD (147) NED (137)" @default.
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- W2072547438 date "1981-11-01" @default.
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- W2072547438 title "A spectrophotometric classification of low-redshift quasars and active galactic nuclei" @default.
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