Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344701g&link_type=abstract
American Astronomical Society, AAS Meeting #213, #447.01; Bulletin of the American Astronomical Society, Vol. 41, p.333
Other
Scientific paper
We have defined the largest and most homogenous sample of galaxies with strong forbidden high-ionization emission lines (FHILs). These lines, with ionization potentials $\gtrsim 100$ eV respond to a portion of the spectrum that is often difficult to observe directly, thereby providing constraints on the EUV--soft X-ray continuum. We combine measurements of [Fe VII] 6087, [Fe X] 6374, and [Fe XI] 7892 Å line fluxes and profiles with models of lower-ionization lines (both narrow and broad) and with X-ray data (available for about half of our sample). We demonstrate many correlations, including the close relationship between the highest-ionization lines and soft X-ray flux. We use these data to make numerous inferences about the structure of the FHIL-emitting region and discuss what information these lines may convey about the high-energy continuum. Among our conclusions, we find evidence for a stratified outflow of FHIL-emitting clouds, in which the [Fe X] and [Fe XI] clouds are sufficiently close to the central engine that they can be obscured by the torus and the [Fe VII]-emitting clouds are extended on much larger scales; that the flux of [Fe X] is directly correlated with the 250 eV continuum and the [Fe X]/[Fe VII] and [Fe X]/[O III] flux ratios provide evidence of an X-ray soft excess; and that prominent FHIL emission is much more common amongst narrow-lined Seyfert 1s than amongst other Seyfert types (NLS1s comprise nearly 20\% of our sample). It is clear that the FHILs are sensitive diagnostics of the geometry on scales between the broad and traditional narrow line regions, and also of the ionizing continuum in the soft X-ray band to which they respond most strongly.
Gelbord Jonathan
Mullaney James R.
Ward Martin J.
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