Electronic Resource
Springer
Astrophysics and space science
205 (1993), S. 19-27
ISSN:
1572-946X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We present high quality spectroscopic observations of a sample of 14 low ionization nuclear emission-line regions (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 [O I] λ 6300 emission ([O I]/Hα 〈 1/6) may beH II regions photoionized by unusually hot O-type stars. LINERs with [O I]/Hα 〈 1/6 may be powered by photoionization from a nonstellar continuum. This is supported by the detection of broad hα emission, a correlation between line width and critical density, and point-like X-ray emission in several of these objects.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00657952
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