Ultraviolet Lines and Gas Composition in NGC 1068 |
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Authors: | Hagai Netzer |
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Institution: | 1. School of Physics and Astronomy and the Wise Observatory Tel Aviv University, Tel Aviv, 69978, Israel
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Abstract: | Recent ultraviolet and X-ray observations suggest that the Fe/O ratio in the NLR gas in NGC 1068 is abnormally high. The X-ray analysis, which is presented elsewhere, suggests a large Fe/H and the data shown and discussed here, in particular the extremely weak O III] λ1663 line, argue for small O/N and O/C. Models to support this claim are shown and discussed. They include improved reddening estimates, dusty and dust-free calculations, and abnormal abundances. The anomalous composition makes NGC 1068 unique among Seyfert galaxies and an unusual laboratory for investigating metal enrichment and depletion. |
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