ISO spectroscopy of Seyfert galaxies: fine structure line diagnostics in seven galaxies

Details ISO spectroscopy of Seyfert galaxies: fine structure line diagnostics in seven galaxies ISO spectroscopy of Seyfert galaxies: fine structure line diagnostics in seven galaxies

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456..261s&link_type=abstract

ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP

Physics

4

Infrared: Galaxies, Lines, Galaxies: Seyfert, Active Nuclei, Starburst, Ism, Galaxies: Individual: 3C 120, Mkn 3, Mkn 6, Mkn 463, Mkn 573, Ic 4329A, I Zw 92

Scientific paper

We present the results of Infrared Space Observatory (ISO) spectroscopic observations of seven Seyfert galaxies collected for the ISO Core Programme. For the galaxies 3C 120, MKN 573, MKN 3, MKN 6 and I ZW 92 we have observed low and high ionization lines with the LWS and SWS spectrometers in partial scan grating mode. MKN 463 and IC 4329A have been observed only with the LWS. Line ratio diagrams are used to separate the nonthermal activity produced in the Narrow Line Regions of the nuclei from the emission originating in starbursts and photodissociation regions. Using standard photoionization models, we fit the observed infrared high ionization fine-structure lines of the NLR of MKN 3, MKN 573 and 3C 120 and estimate the main photoionization model parameters. The lower ionization and neutral fine-structure lines are stronger than predicted by these photoionization models, suggesting that an additional contribution from photodissociation regions (PDR) and HII regions is present. However with the exception of NGC 1068 and Cen A, whose low excitation line ratios resemble those of starburst galaxies, the AGN are characterized by lower [CII]/[OI] ratios, suggesting unusual PDR or XDR conditions.

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