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Redshifts and Neutral Hydrogen Observations of Compact Symmetric Objects in the COINS Sample
A. B. Peck, G. B. Taylor, C. D. Fassnacht +2
Compact Symmetric Objects (CSOs) are young radio galaxies whose jet axes lie close to the plane of the sky, and whose appearance is therefore not dominated by relativistic beaming…
A Keck Survey of Gravitational Lens Systems: I. Spectroscopy of SBS 0909+532, HST 1411+5211, and CLASS B2319+051
L. M. Lubin, C. D. Fassnacht, A. C. S. Readhead +2
We present new results from a continuing Keck program to study gravitational lens systems. We have obtained redshifts for three lens systems, SBS 0909+532, HST 1411+5211, and CLASS…
Measuring H_0 with CLASS B1608+656: The Second Season of VLA Monitoring
C. D. Fassnacht, E. Xanthopoulos, L. V. E. Koopmans +3
The four-component gravitational lens CLASS B1608+656 has been monitored with the VLA for two seasons in order to search for time delays between the components. These time delays c…
A Determination of H_0 with the CLASS Gravitational Lens B1608+656: I. Time Delay Measurements with the VLA
C. D. Fassnacht, T. J. Pearson, A. C. S. Readhead +4
We present the results of a program to monitor the four-image gravitational lens B1608+656 with the VLA. The system was observed over a seven month period from 1996 October to 1997…
The Proper Motion of SgrA*: I. First VLBA Results
M. J. Reid, A. C. S. Readhead, R. C. Vermeulen +1
We observed Sgr A* and two extragalactic radio sources nearby in angle with the VLBA over a period of two years and measured relative positions with an accuracy approaching 0.1 mas…
CLASS B1152+199 and B1359+154: Two New Gravitational Lens Systems Discovered in the Cosmic Lens All-Sky Survey
S. T. Myers, D. Rusin, C. D. Fassnacht +9
The third phase of the Cosmic Lens All-Sky Survey (CLASS) has recently been completed, bringing the total number of sources imaged to over 15000 in the CLASS and JVAS combined surv…
Discovery of a Radio Flare from GRB 990123
S. R. Kulkarni, D. A. Frail, R. Sari +7
We report the discovery of a radio counterpart to GRB 990123. In contrast to previous well-studied radio afterglows which rise to peak flux on a timescale of a week and then decay…