15 GHz Monitoring of the Gravitational Lens MG 0414+0534

Abstract

We report the results of monitoring the four images of the gravitational lens MG 0414+0534 at 15 GHz. In 35 VLA maps spanning 180 days, we measure root-mean-square variations in the image light curves of ~3.5% mostly due to variations in the flux density calibration. The flux ratios, which are independent of flux density calibration variations, show root-mean-square variability of 1-3%. Extensive simulations of the data analysis process show that the observed variations in the flux ratios are likely to be due entirely to errors in the deconvolution process. It is possible that some of the observed variation is due to the source; however, the signal-to-noise ratio is too small to make a time delay determination using a data set of this size.

17 pages, Latex, to appear in Ap.J. November 1997

References in corpus (1)

• HST Observations and Models of The Gravitational Lens System MG 0414+0534

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• A Determination of H_0 with the CLASS Gravitational Lens B1608+656: I. Time Delay Measurements with the VLA
• Identifying Lenses with Small-Scale Structure. II. Fold Lenses
• A multipole-Taylor expansion for the potential of gravitational lens MG J0414+0534
• Origin of Chromatic Features in Multiple Quasars -Variability, Dust, or Microlensing -
• Radio Monitoring Campaigns of Six Strongly Lensed Quasars