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1978•The Astrophysical JournalRequires access

Optical spectra of radio galaxies

Steven A. Grandi, Donald E. Osterbrock

Open publisher page 60 citations

Abstract

Based on Lick image-tube-image-dissector scans of 35 radio galaxies known to have emission lines, a high degree of association is found between the spectroscopic classification 'broad-line' and the morphological classification 'N.' Relative line intensities are presented for nine broad-line radio galaxies (BLRG). These data, combined with previously published results, illustrate three spectroscopic differences between BLRG and Seyfert 1 galaxies: BLRG have much weaker Fe II emission, steeper H-alpha/H-beta ratios, and larger 5007-A forbidden O III/H-beta ratios than Seyfert 1 galaxies.

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What this paper is about

Based on Lick image-tube-image-dissector scans of 35 radio galaxies known to have emission lines, a high degree of association is found between the spectroscopic classification 'broad-line' and the morphological classification 'N.' Relative line intensities are presented for nine broad-line radio galaxies (BLRG). These data, combined with previously published results, illustrate three spectroscopic differences between BLRG and Seyfert 1 galaxies: BLRG have much weaker Fe II emission, steeper H-alpha/H-beta ratios, and larger 5007-A forbidden O III/H-beta ratios than Seyfert 1 galaxies.

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Available abstract

Based on Lick image-tube-image-dissector scans of 35 radio galaxies known to have emission lines, a high degree of association is found between the spectroscopic classification 'broad-line' and the morphological classification 'N.' Relative line intensities are presented for nine broad-line radio galaxies (BLRG). These data, combined with previously published results, illustrate three spectroscopic differences between BLRG and Seyfert 1 galaxies: BLRG have much weaker Fe II emission, steeper H-alpha/H-beta ratios, and larger 5007-A forbidden O III/H-beta ratios than Seyfert 1 galaxies.

Key concepts: Physics, Astrophysics, Galaxy, Radio galaxy, Doubly ionized oxygen, Luminous infrared galaxy, Spectral line, Emission spectrum

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