期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 413, 期 1, 页码 643-658出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.18161.x
关键词
gravitational lensing: strong; galaxies: abundances; galaxies: evolution; galaxies: high-redshift; galaxies: kinematics and dynamics
资金
- EU
- STFC
- Danish National Research Foundation
- STFC [ST/H005234/1, ST/H001913/1] Funding Source: UKRI
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [909159] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/H005234/1, ST/H001913/1] Funding Source: researchfish
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 similar or equal to 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 similar to 2-3, especially in the low mass (similar to 109 M-circle dot) where our sample is similar to 0.25 dex more metal-rich. We interpret this offset as a result of the lower star formation rates (typically a factor of similar to 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.
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