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arXiv 0811.2085astro-ph
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VIMOS VLT深巡天中星系的物理性质及其演化。II。将质量-金属丰度关系扩展到z=0.89-1.24的范围

Physical properties of galaxies and their evolution in the VIMOS VLT Deep Survey. II. Extending the mass-metallicity relation to the range z=0.89-1.24

E. Perez-Montero, T. Contini, F. Lamareille, J. Brinchmann, C. J. Walcher, S. Charlot, M. Bolzonella, L. Pozzetti, D. Bottini, B. Garilli, V. Le Brun, O. Le Fev… 展开作者

E. Perez-Montero, T. Contini, F. Lamareille, J. Brinchmann, C. J. Walcher, S. Charlot, M. Bolzonella, L. Pozzetti, D. Bottini, B. Garilli, V. Le Brun, O. Le Fevre, D. Maccagni, R. Scaramella, M. Scodeggio, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnouts, S. Bardelli, A. Cappi, P. Ciliegi, S. Foucaud, P. Franzetti, I. Gavignaud, L. Guzzo, O. Ilbert, A. Iovino, H. J. McCracken, B. Marano, C. Marinoni, A. Mazure, B. Meneux, R. Merighi, S. Paltani, R. Pello, A. Pollo, M. Radovich, D. Vergani, G. Zamorani, E. Zucca

摘要:

目标。本文是对VIMOS VLT深度巡天(VVDS)中恒星质量与气相金属丰度关系研究的继续。在这项工作中,我们扩展到红移= 1.24的42个恒星形成星系的平均红移值为0.99的样本的金属丰度的测定。方法.对于一个选定的样本的发射线星系,我们使用的诊断图和经验校准的基础上[OII]发射线的经验关系的[OIII]和[NeIII]发射线的强度和理论之间的比例巴耳末复合发射线,以确定恒星形成的星系,并推导出它们的金属丰度。我们用一组恒星星族合成模型拟合整个光谱能量分布,得到恒星质量。结果这些新方法使我们能够将质量-金属丰度关系扩展到更高的红移。我们表明,金属丰度测定与更成熟的强线方法是一致的。两者合计,这使我们能够研究的质量-金属丰度关系的演变z = 1.24与系统的不确定性的良好控制。我们发现的星系的平均金属丰度的红移的演变非常相似的文献中报道的:对于一个给定的恒星质量,星系在z = 1,平均而言,金属丰度= 0.3德克斯低于星系在当地的宇宙。然而,我们没有看到红移z = 0.7(论文I)和z = 1.0(本文)之间有任何显着的金属丰度演化。我们还发现,在较低的红移下,最大质量的星系的质量-金属丰度关系与论文I中报道的一样平坦,但在z = 0.7和z = 1.0之间,斜率再次没有明显的演变。

英文摘要:

Aims. We present a continuation of our study about the relation between stellar mass and gas-phase metallicity in the VIMOS VLT Deep Survey (VVDS). In this work we extend the determination of metallicities up to redshift = 1.24 for a sample of 42 star-forming galaxies with a mean redshift value of 0.99. Methods. For a selected sample of emission-line galaxies, we use both diagnostic diagrams and empirical calibrations based on [OII] emission lines along with the empirical relation between the intensities of the [OIII] and [NeIII] emission lines and the theoretical ratios between Balmer recombination emission lines to identify star-forming galaxies and to derive their metallicities. We derive stellar masses by fitting the whole spectral energy distribution with a set of stellar population synthesis models. Results. These new methods allow us to extend the mass-metallicity relation to higher redshift. We show that the metallicity determinations are consistent with more established strong-line methods. Taken together this allows us to study the evolution of the mass-metallicity relation up to z = 1.24 with good control of systematic uncertainties. We find an evolution with redshift of the average metallicity of galaxies very similar to those reported in the literature: for a given stellar mass, galaxies at z = 1 have, on average, a metallicity = 0.3 dex lower than galaxies in the local universe. However we do not see any significant metallicity evolution between redshifts z = 0.7 (Paper I) and z = 1.0 (this paper). We find also the same flattening of the mass-metallicity relation for the most massive galaxies as reported in Paper I at lower redshifts, but again no apparent evolution of the slope is seen between z = 0.7 and z = 1.0.

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