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Spectrophotometric properties of galaxies at intermediate redshifts (z ~ 0.2--1.0) II. The Luminosity -- Metallicity relation

We present the gas-phase oxygen abundance (O/H) for a sample of 131 star-forming galaxies at intermediate redshifts (\(0.2

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Published in:	arXiv.org 2005-11
Main Authors:	Lamareille, Fabrice, Contini, Thierry, Brinchmann, Jarle, Jean-François Le Borgne, Charlot, Stéphane, Richard, Johan
Format:	Article
Language:	English
Subjects:	Astronomical models Data reduction Empirical analysis Galaxies Ionization Line spectra Local group (astronomy) Luminosity Metallicity Parameter uncertainty Photometry Red shift Spectral classification Spectrophotometry Star formation Statistical methods Universe
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creator	Lamareille, Fabrice Contini, Thierry Brinchmann, Jarle Jean-François Le Borgne Charlot, Stéphane Richard, Johan
description	We present the gas-phase oxygen abundance (O/H) for a sample of 131 star-forming galaxies at intermediate redshifts (\(0.2
doi_str_mv	10.48550/arxiv.0511135
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The Luminosity -- Metallicity relation</title><source>Publicly Available Content (ProQuest)</source><creator>Lamareille, Fabrice ; Contini, Thierry ; Brinchmann, Jarle ; Jean-François Le Borgne ; Charlot, Stéphane ; Richard, Johan</creator><creatorcontrib>Lamareille, Fabrice ; Contini, Thierry ; Brinchmann, Jarle ; Jean-François Le Borgne ; Charlot, Stéphane ; Richard, Johan</creatorcontrib><description>We present the gas-phase oxygen abundance (O/H) for a sample of 131 star-forming galaxies at intermediate redshifts ($0.2<z<1.0$). The sample selection, the spectroscopic observations (mainly with VLT/FORS) and associated data reduction, the photometric properties, the emission-line measurements, and the spectral classification are fully described in a companion paper (Paper I). We use two methods to estimate the O/H abundance ratio: the {} "standard" $R\_{\mathrm{23}}$ method which is based on empirical calibrations, and the CL01 method which is based on grids of photo-ionization models and on the fitting of emission lines. For most galaxies, we have been able to solve the problem of the metallicity degeneracy between the high- and low-metallicity branches of the O/H vs. $R\_{\mathrm{23}}$ relationship using various secondary indicators. The luminosity -- metallicity ($L-Z$) relation has been derived in the $B$- and $R$-bands, with metallicities derived with the two methods ($R\_{\mathrm{23}}$ and CL01). In the analysis, we first consider our sample alone and then a larger one which includes other samples of intermediate-redshift galaxies drawn from the literature. The derived $L-Z$ relations at intermediate redshifts are very similar (same slope) to the $L-Z$ relation obtained for the local universe. Our sample alone only shows a small evolution of the $L-Z$ relation with redshift up to $z\sim1.0$. We only find statistical variations consistent with the uncertainty in the derived parameters. Including other samples of intermediate-redshift galaxies, we find however that galaxies at $z\sim1$ appear to be metal-deficient by a factor of $\sim3$ compared with galaxies in the local universe. 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The luminosity -- metallicity ($L-Z$) relation has been derived in the $B$- and $R$-bands, with metallicities derived with the two methods ($R\_{\mathrm{23}}$ and CL01). In the analysis, we first consider our sample alone and then a larger one which includes other samples of intermediate-redshift galaxies drawn from the literature. The derived $L-Z$ relations at intermediate redshifts are very similar (same slope) to the $L-Z$ relation obtained for the local universe. Our sample alone only shows a small evolution of the $L-Z$ relation with redshift up to $z\sim1.0$. We only find statistical variations consistent with the uncertainty in the derived parameters. Including other samples of intermediate-redshift galaxies, we find however that galaxies at $z\sim1$ appear to be metal-deficient by a factor of $\sim3$ compared with galaxies in the local universe. 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subjects	Astronomical models Data reduction Empirical analysis Galaxies Ionization Line spectra Local group (astronomy) Luminosity Metallicity Parameter uncertainty Photometry Red shift Spectral classification Spectrophotometry Star formation Statistical methods Universe
title	Spectrophotometric properties of galaxies at intermediate redshifts (z ~ 0.2--1.0) II. The Luminosity -- Metallicity relation
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