Swinbank, A. M. and Smith, J. and Bower, R. G. and Bunker, A. and Smail, I. and Ellis, R. S. and Smith, G. P. and Kneib, J. P. and Sullivan, M. and Allington-Smith, J.R. (2003) 'Galaxies under the cosmic microscope : a gemini multiobject spectrograph study of lensed disk galaxy 289 in A2218.', Astrophysical journal., 598 (1). pp. 162-167.
In this paper, we exploit the gravitational potential of the rich cluster A2218 as a magnifying glass. We demonstrate that the magnification due to the cluster allows us to observe distant background galaxies at a comparable level of detail to galaxies at z similar to 0.1. Using the Gemini Multiobject Spectrograph (GMOS) integral field unit (IFU) on Gemini North, we observed the spatially resolved [O II] lambda3727 emission line spectrum for a lensed disk galaxy at z = 1.034. Using a detailed model for the cluster mass distribution, we are able to correct for the lensing by the cluster and reconstruct the source morphology. We find that the overall magnification is a factor of 4.92 +/- 0.15, and the rest-frame absolute I-band magnitude is M-I(rest) = -22.4 +/- 0.2, where the error bars include conservative estimates of the uncertainty in the source-plane reconstruction. The inclination-corrected circular velocity is 206 +/- 18 km s(-1). The galaxy lies very close to the mean Tully-Fisher relation of present-day spirals. Although our results are based on a single object, they demonstrate that gravitational lensing can be viably used to make detailed studies of the evolution of the structure of distant field galaxies.
|Keywords:||Galaxies, Evolution, Formation, Halos, High-redshift, Kinematics, Dynamics, Spiral.|
|Full text:||PDF - Published Version (278Kb)|
|Publisher Web site:||http://dx.doi.org/10.1086/378787|
|Publisher statement:||© 2003. The American Astronomical Society. All rights reserved.|
|Record Created:||20 May 2008|
|Last Modified:||12 Aug 2014 11:42|
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