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Galaxies under the cosmic microscope : a gemini multiobject spectrograph study of lensed disk galaxy 289 in A2218.

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.

Item Type:Article
Keywords:Galaxies, Evolution, Formation, Halos, High-redshift, Kinematics, Dynamics, Spiral.
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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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