Gas-phase metallicity of 27 galaxies at intermediate redshift

L. Morelli; V. Calvi; A. Cardullo; A. Pizzella; E. M. Corsini; E. Dalla Bontà

doi:doi:10.1051/0004-6361/201219316

Issue		A&A Volume 544, August 2012


Article Number		A74
Number of page(s)		6
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361/201219316
Published online		31 July 2012

A&A 544, A74 (2012)

Research Note

Gas-phase metallicity of 27 galaxies at intermediate redshift^⋆,^⋆⋆

L. Morelli¹^,2, V. Calvi¹^,3, A. Cardullo¹, A. Pizzella¹^,2, E. M. Corsini¹^,2 and E. Dalla Bontà¹^,2

¹ Dipartimento di Fisica e Astronomia “G. Galilei"Università di Padova, vicolo dell’Osservatorio 3, 35122 Padova, Italy
e-mail: lorenzo.morelli@unipd.it
² INAF – Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 2, 35122 Padova, Italy
³ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

Received: 30 March 2012
Accepted: 22 June 2012

Abstract

Aims. The purpose of this work is to make available new gas-phase oxygen abundance measurements for a serendipitous sample of 27 galaxies with redshifts 0.35 ≤ z ≤ 0.52.

Methods. We measured the equivalent widths of the [O ii]λ3727, Hβ, and [O iii]λλ4959,5007 emission lines observed in the galaxy spectra obtained with the Visible Multi-Object Spectrograph mounted at the Very Large Telescope. For each galaxy, we derived the metallicity-sensitive emission-line ratio R₂₃, ionization-sensitive emission-line ratio O₃₂, and gas-phase oxygen abundance 12 + log (O/H).

Results. The values of the gas-phase oxygen abundance 12 + log (O/H) that we obtained for all the sample galaxies are consistent with previous findings for galaxies at intermediate redshift.

Key words: galaxies: distances and redshifts / galaxies: evolution / galaxies: formation / galaxies: fundamental parameters / galaxies: ISM

^⋆

Based on observations made with ESO Telescopes at the La Silla-Paranal Observatory under programmes 075.B-0794 and 077.B-0767.

^⋆⋆

Tables 1 and 3 are available in electronic form at http://www.aanda.org

© ESO, 2012

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Gas-phase metallicity of 27 galaxies at intermediate redshift⋆,⋆⋆

Gas-phase metallicity of 27 galaxies at intermediate redshift^⋆,^⋆⋆