Journal Article

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

Johan Richard, Tucker Jones, Richard Ellis, Daniel P. Stark, Rachael Livermore and Mark Swinbank

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 413, issue 1, pages 643-658
Published in print May 2011 | ISSN: 0035-8711
Published online April 2011 | e-ISSN: 1365-2966 | DOI:
The emission line properties of gravitationally lensed 1.5 < z < 5 galaxies

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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) 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.

Keywords: gravitational lensing: strong; galaxies: abundances; galaxies: evolution; galaxies: high-redshift; galaxies: kinematics and dynamics

Journal Article.  9944 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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