Friday, 12 November 2010

A Compact Early-type Galaxy at z = 0.6 Under a Magnifying Lens

By Auger et al.

Figure 1. Keck LGS-AO imaging of the EEL SDSSJ1347-0101 (left). The image is well modelled using a singular isothermal ellipsoid mass distribution for the lensing mass, a single Sersic component for the lensing galaxy, and a two-component de Vaucouleurs and Sersic profile for the background source (right), while a single-component fit to the source leaves a ring of residual flux (centre); the scaling of the two residual plots is set to saturate at 3 times the background noise level. The Kp-band imaging reveals an observed source magnitude of 17.6 but this is corrected to 20.3 when the magnification from lensing is taken into account; the inferred stellar mass of the source is 10^10.9M⊙ and the half-light radius of the two-component surface brightness model is 0.′′16 or 1.1 kpc at the redshift of the source.

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