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Metallicity of the high-redshift Universe traced by radio galaxies

  • K. Matsuoka (a1), T. Nagao, R. Maiolino, A. Marconi and Y. Taniguchi...

Abstract

We investigate the metallicity of the narrow line regions (NLRs) of high-z radio galaxies (HzRGs), using new deep optical spectra of 9 HzRGs obtained with FORS2 on VLT and data from the literature. To estimate the metallicity of NLRs we focus on the Civ/Heii and Ciii]/Civ flux ratios. Based on comparison between the observed emission-line flux ratios and the prediction of our photoionization model calculations, we find no significant metallicity evolution in NLRs of HzRGs, up to z ~ 4. We discuss the possibility that massive galaxies had almost completed the major epoch of the star formation in the very high-z universe (z > 5).

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References

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Ferland, G. J., Korista, K. T., Verner, D. A., et al. 1998, PASP, 110, 761
Maiolino, R., Nagao, T., Grazian, A., et al. 2008, A&A, 488, 463
Matsuoka, K., Nagao, T., Maiolino, R., et al. 2009, A&A, 503, 721
Nagao, T., Maiolino, R., & Marconi, A. 2006, A&A, 447, 863
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