Chemical evolution of high-redshift radio galaxies

被引：0

作者：

Matsuoka, K. ^{[1
]}

Nagao, T. ^{[1
,2
]}

Maiolino, R. ^{[3
]}

Marconi, A. ^{[4
]}

Taniguchi, Y. ^{[2
]}

机构：

[1] Graduate School of Science and Engineering, Ehime University, 2-5 Bunkyo-cho, Matsuyama 790-8577, Japan

[2] Research Center for Space and Cosmic Evolution, 2-5 Bunkyo-cho, Matsuyama 790-8577, Japan

[3] INAF - Osservatorio Astrofisico di Roma, Via di Frascati 33, 00040 Monte Porzio Catone, Italy

[4] Dipartimento di Astronomia e Scienza Dello Spazio, Universita Degli Studi di Firenze, Largo E. Fermi 2, 50125 Firenze, Italy

来源：

Astronomy and Astrophysics | 2009年 / 503卷 / 03期

关键词：

We present new deep optical spectra of 9 high-z radio galaxies (HzRGs) at z > 2.7 obtained with FORS2 on VLT. These rest-frame ultraviolet spectra are used to infer the metallicity of the narrow-line regions (NLRs) in order to investigate the chemical evolution of galaxies in the high-z universe. We focus mainly on the Civ/He ii and C iii]/Civ flux ratios that are sensitive to both the gas metallicity and ionization parameter. Although the Nv emission has been widely used to infer the gas metallicity; it is often too weak to be measured accurately for NLRs. In combining our new spectra with data from the literature; we examine the possible redshift evolution of the NLR metallicity for 57 HzRGs at 1 z 4. Based on the comparison between the observed emission-line flux ratios and the results of our photoionization model calculations; we find no significant metallicity evolution in NLRs of HzRGs; up to z ∼ 4. Our results imply that massive galaxies had almost completed their chemical evolution at much higher redshift (z > 5). Finally; although we detect strong Nv emission lines in 5 HzRGs at z > 2.7; we point out that high Nv/He ii ratios are not indicative of high metallicities but correspond to high ionization parameters of gas clouds in NLRs. © ESO 2009;

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摘要：

Journal article (JA)

引用

页码：721 / 730

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