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

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

Research output: Contribution to journalArticle

91 Scopus citations

Abstract

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 ≃10 9 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.

Original languageEnglish (US)
Pages (from-to)643-658
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume413
Issue number1
DOIs
StatePublished - May 1 2011
Externally publishedYes

Keywords

  • Galaxies: abundances
  • Galaxies: evolution
  • Galaxies: high-redshift
  • Galaxies: kinematics and dynamics
  • Gravitational lensing: strong

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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