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The photoionization mechanism of LINERs - Stellar and nonstellarWe 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.
Document ID
19940036499
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ho, Luis C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Filippenko, Alexei V.
(California Univ. Berkeley, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Publication Information
Publication: Astrophysics and Space Science
Volume: 205
Issue: 1
ISSN: 0004-640X
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NSF AST-89-57063
CONTRACT_GRANT: NAG5-1800
CONTRACT_GRANT: NSF AST-90-03829
Distribution Limits
Public
Copyright
Other
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