SIMBAD references

2010ApJ...725.2270P - Astrophys. J., 725, 2270-2280 (2010/December-3)

The mid-infrared high-ionization lines from active galactic nuclei and star-forming galaxies.


Abstract (from CDS):

We used Spitzer/Infrared Spectrograph spectroscopic data on 426 galaxies including quasars, Seyferts, LINERs, and H II galaxies to investigate the relationship among the mid-IR emission lines. There is a tight linear correlation between the [Ne V]14.3 µm and 24.3 µm (97.1 eV) and the [O IV]25.9 µm (54.9 eV) high-ionization emission lines. The correlation also holds for these high-ionization emission lines and the [Ne III]15.56 µm (41 eV) emission line, although only for active galaxies. We used these correlations to calculate the [Ne III] excess due to star formation in Seyfert galaxies. We also estimated the [O IV] luminosity due to star formation in active galaxies and determined that it dominates the [O IV] emission only if the contribution of the active nucleus to the total luminosity is below 5%. We find that the active galactic nucleus dominates the [O IV] emission in most Seyfert galaxies, whereas star formation adequately explains the observed [O IV] emission in optically classified H II galaxies. Finally, we computed photoionization models to determine the physical conditions of the narrow-line region where these high-ionization lines originate. The estimated ionization parameter range is -2.8 < log U < -2.5 and the total hydrogen column density range is 20 < log nH(/cm2) < 21.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: starburst - infrared: galaxies

VizieR on-line data: <Available at CDS (J/ApJ/725/2270): table1.dat>

Simbad objects: 438

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