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Session 47 - Microlensing.
Display session, Tuesday, January 16
North Banquet Hall, Convention Center

[47.02] VLA Monitoring of Gravitational Lens 0957+561: Current Best Estimate of the Time Delay

D. B. Haarsma, J. N. Hewitt (MIT), J. Lehár (CfA), L. Sopata, B. F. Burke (MIT)

The gravitational lens 0957+561 has been monitored by our group at 5 GHz since its discovery in 1979. Observations typically occur once a month at the VLA, except when the array is in its D configuration. There are currently about 140 good quality observations between 1979 and 1995. The A image of the quasar increased in flux in 1993, and, as expected, the rise in the B image was seen in mid 1995. This and other recent features in the light curves yield new information for the determination of the time delay. Current estimates of the time delay and their implications for H_0 will be presented.

Program listing for Tuesday