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B.G. Piner, D. Bhattarai (Whittier College), P.G. Edwards (ISAS/JAXA), D.L. Jones (JPL)
We present multi-epoch Very Long Baseline Array (VLBA) observations at 22 and 43 GHz of the three EGRET blazars 0235+164, 0827+243, and 1406-076. These three blazars were tentatively identified as having apparent speeds of approximately 40 c in the snapshot VLBA survey of EGRET blazars by Jorstad et al. (2001). Based on six epochs of full-track VLBA observations of each source during 2002 and 2003, we measure peak apparent speeds of 29±6 c, 26± 4 c, and 30±9 c in the jets of 0235+164, 0827+243, and 1406-076, respectively (for H0=71 km s-1 Mpc-1, \Omegam=0.27, and \Omega\Lambda=0.73). We therefore confirm the presence of ultra-relativistic jets in these sources, with the implied lower limit to the bulk Lorentz factor from the observed apparent speeds being \Gamma > 25-30, or v > 0.999 c. This material is based upon work supported by the National Science Foundation under Grant No. 0305475 and by a Cottrell College Science Award from Research Corporation.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.