Smail, Ian and Swinbank, A. M. and Richard, J. and Ebeling, H. and Kneib, J.-P. and Edge, A. C. and Stark, D. and Ellis, R. S. and Dye, S. and Smith, G. P. and Mullis, C. (2007) A Very Bright, Highly Magnified Lyman Break Galaxy at z = 3.07. Astrophysical Journal Letters, 654 (1). L33-L36. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20100211-104214154
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Using Hubble Space Telescope imaging and Keck spectroscopy, we report the discovery of a very bright, highly magnified (~30 times) Lyman break galaxy (LBG) at z = 3.07 in the field of the massive z = 0.33 cluster MACS J2135.2-0102. The system comprises two high surface brightness arcs with a maximum extent of 3", bracketing a central object that we identify as a massive early-type galaxy at z = 0.73. We construct a lens model that reproduces the main features of the system using a combination of a galaxy-scale lens and the foreground cluster. We show that the morphological, spectral, and photometric properties of the arcs are consistent with them arising from the lensing of a single ~L^*_(V) LBG. The most important feature of this system is that the lensing magnification results in an apparent magnitude of r = 20.3, making this one of the brightest LBGs known. Such a high magnification provides the opportunity of obtaining very high signal-to-noise ratio (and potentially spatially resolved) spectroscopy of a high-redshift galaxy to study its physical properties. We present initial imaging and spectroscopy demonstrating the basic properties of the system and discuss the opportunities for future observations.
|Additional Information:||© 2007 American Astronomical Society. Print publication: Issue 1 (2007 January 1); received 2006 August 4; accepted for publication 2006 November 16; published 2006 December 20. We thank Max Pettini for help and useful discussions and an anonymous referee for constructive comments which improved this work. I. S. and G. P. S. acknowledge support from the Royal Society, and A. M. S. acknowledges support from PPARC.|
|Subject Keywords:||cosmology: observations; galaxies: evolution; galaxies: formation; galaxies: individual (LBG J213512.73–010143)|
|Official Citation:||A Very Bright, Highly Magnified Lyman Break Galaxy at z = 3.07 Ian Smail, A. M. Swinbank, J. Richard, H. Ebeling, J.-P. Kneib, A. C. Edge, D. Stark, R. S. Ellis, S. Dye, G. P. Smith, and C. Mullis 2007 ApJ 654 L33-L36 doi: 10.1086/510902|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||11 Feb 2010 21:23|
|Last Modified:||26 Dec 2012 11:46|
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