1997/08/08 by Christopher B. Moore, Jacqueline N. Hewitt · 1 citation
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Advanced Thermodynamic Systems and Engines #Geophysics and Gravity Measurements #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1086/304963
17 pages, Latex, to appear in Ap.J. November 1997
arxiv created 1997/08/08 · openalex publication_date 1997/12/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
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.