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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2011

The emission line properties of gravitationally lensed 1.5 < z < 5 galaxies

Résumé

We present and analyse near-infrared spectroscopy for a sample of 28 gravitationally lensed star-forming galaxies in the redshift range 1.5 < z < 5, observed mostly with the Keck II telescope. With typical magnifications of ≃1.5-4 mag, our survey provides a valuable census of star formation rates, gas-phase metallicities and dynamical masses for a representative sample of low-luminosity galaxies seen at a formative period in cosmic history. We find less evolution in the mass-metallicity relation compared to earlier work that focused on more luminous systems with z˜ 2-3, especially in the low mass (˜109 M&sun;) where our sample is ˜0.25 dex more metal-rich. We interpret this offset as a result of the lower star formation rates (typically a factor of ˜10 lower) for a given stellar mass in our subluminous systems. Taking this effect into account, we conclude our objects are consistent with a fundamental metallicity relation recently proposed from unlensed observations.

Dates et versions

hal-00660695 , version 1 (17-01-2012)

Identifiants

Citer

Johan Richard, Tucker Jones, Richard Ellis, Daniel P. Stark, Rachael Livermore, et al.. The emission line properties of gravitationally lensed 1.5 < z < 5 galaxies. Monthly Notices of the Royal Astronomical Society, 2011, 413, pp.643-658. ⟨10.1111/J.1365-2966.2010.18161.X⟩. ⟨hal-00660695⟩
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