Richard, Johan and Jones, Tucker and Ellis, Richard and Stark, Daniel P. and Livermore, Rachael and Swinbank, Mark (2011) The emission line properties of gravitationally lensed 1.5<z<5 galaxies. Monthly Notices of the Royal Astronomical Society, 413 (1). pp. 643-658. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20110510-104519889
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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 (~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.
|Additional Information:||© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011. Accepted 2010 December 6. Received 2010 November 29; in original form 2010 October 29. Article first published online: 2 Feb. 2011. We acknowledge valuable comments from Filippo Mannucci which improved the content and clarity of the paper, and helpful discussions with Fabrice Lamareille. We are grateful to Steven Finkelstein for help in comparing our results on the 8OCLOCK arc. JR acknowledges support from an EU Marie-Curie fellowship. DPS acknowledges support from an STFC Postdoctoral Research Fellowship. Results are partially based on observations made with the NASA/ESA Hubble Space Telescope, the Spitzer Space Telescope and the Keck telescope. The authors recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. The Dark Cosmology Centre is funded by the Danish National Research Foundation.|
|Subject Keywords:||gravitational lensing: strong; galaxies: abundances; galaxies: evolution; galaxies: high-redshift; galaxies: kinematics and dynamics|
|Official Citation:||Richard, J., Jones, T., Ellis, R., Stark, D. P., Livermore, R. and Swinbank, M. (2011), The emission line properties of gravitationally lensed 1.5 < z < 5 galaxies. Monthly Notices of the Royal Astronomical Society, 413: 643–658. doi: 10.1111/j.1365-2966.2010.18161.x|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||10 May 2011 20:51|
|Last Modified:||10 May 2011 20:51|
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