Dipartimento di Fisica e Astronomia “G. Galilei"Università di
vicolo dell’Osservatorio 3,
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
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