The photoionization mechanism of LINERs - Stellar and nonstellar

Details The photoionization mechanism of LINERs - Stellar and nonstellar The photoionization mechanism of LINERs - Stellar and nonstellar

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.205...19h&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 205, no. 1, p. 19-27.

Astronomy and Astrophysics

Astronomy

5

Active Galactic Nuclei, Nuclear Radiation, Photoionization, Stellar Radiation, Visible Spectrum, O Stars, X Ray Astronomy

Scientific paper

We present high quality spectroscopic observations of a sample of 14 LINERs. Starlight removal is achieved by the subtraction of a suitable absorption-line 'template' galaxy, allowing accurate measurements of emission lines. We use these line fluxes to examine the possible excitation mechanisms of LINERs. We suggest that LINERs with weak forbidden O I 6300-A emission may be H II regions photoionized by unusually hot O-type stars. LINERs with forbidden O I/H-alpha approximately greater than 1/6 may be powered by photoionization from a nonstellar continuum. This is supported by the detection of broad H-alpha emission, a correlation between line width and critical density, and pointlike X-ray emission in several of these objects.

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