NGC 7213 - A key to the nature of liners?

Details NGC 7213 - A key to the nature of liners? NGC 7213 - A key to the nature of liners?

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..458f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. 458-474.

Astronomy and Astrophysics

Astrophysics

213

Emission Spectra, Galactic Nuclei, Interstellar Gas, Optical Emission Spectroscopy, Seyfert Galaxies, Spectrophotometry, Balmer Series, Hydrogen Clouds, Ionized Gases, Photoionization, Shock Heating, Spectral Line Width, Spectrum Analysis

Scientific paper

New optical spectra show that the nucleus of the S0 galaxy NGC 7213 resembles those of type 1 Seyferts: emission lines such as [Ne V] λ3426, He II λ4686, and broad Hα are visible, and a nonstellar component accounts for a substantial portion of the continuum at blue and ultraviolet wavelengths. Many of the emission-line intensity ratios suggest heating due to shocks, since they are similar to those in "Liners". After subtracting the stellar continuum careful measurements of various emission lines are presented and a number of important physical parameters are derived. The Seyfert characteristics of NGC 7213 are reviewed, and its shock features are reconciled with photoionization models. The arguments may apply to classical Liners as well. Finally, theoretical models are explored that can help explain the relationships discovered among the emission lines.

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