NASA/IPAC EXTRAGALACTIC DATABASE
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For refcode 1996MNRAS.283..777S:
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Copyright by Royal Astronomical Society. 1996MNRAS.283..777S Forbidden Fe emission from active galaxies Chris Simpson, Duncan A. Forbes, Amanda C. Baker and Martin J. Ward Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA Lick Observatory, University of California, Santa Cruz CA 95064, USA Institute of Astronomy, Madingley Road, Cambridge CB3 011A Astrophysics, Oxford University Keble Road, Oxford OXl 3RII Accepted 1996 July 1. Received 1996 June 25; in original form 1996 March 4 ABSTRACT We present intermediate-resolution (~400 km s^-1^) near-infrared spectra for eight Seyfert and three starburst galaxies, covering the [Fe II] 1.257-micron and Pa{beta} lines. We combine these data with those in the literature to investigate the origin of the forbidden Fe + emission in active galaxies, which is still under debate. In a study of 26 active galaxies, Forbes & Ward provided evidence that [Fe II] emission in starburst galaxies is shock-excited by supernova remnants. Interestingly, the Seyfert galaxies in their sample also appeared to have shock-excited [Fe II] emission, although the radio jets were believed to be responsible. Analysis of our sample of 46 objects provides some support for the finding by Forbes & Ward that [Fe II] is more tightly correlated with radio power than the hydrogen recombination emission. However, we argue that the observed line ratios are inconsistent with the substantial grain destruction that is an inevitable consequence of shocks. Together with the fact that the dispersion in the [Fe II] -radio correlation is still fairly large, we deduce that photoionization of material with normal ISM abundances must be the dominant excitation mechanism, although we suggest that a significant contribution (20 per cent) of the [Fe II] emission may be shock-excited. Key words: galaxies: active - galaxies: nuclei - galaxies: Seyfert - galaxies: starburst - infrared: galaxies - radio continuum: galaxies.
Retrieve 45 NED objects in this reference.
Please click here for ADS abstract

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