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[vsolj-alert 74] CI Cam jet revealed!


From: "Robert M. Hjellming (Bob)" <rhjellmi@aoc.nrao.edu>
Subject: [vsnet-alert 0] copy of IAU Circular submission on radio jets in
         XTE J0421+560 (= CI Cam)

Date: Tue, 07 Apr 1998 12:57:49 -0600

From: "Robert M. Hjellming (Bob)" <rhjellmi@nrao.edu>
Subject: IAU Circular submission on XTE J0421+560 and CI Cam
Cc: rhjellmi, amiodusz


R.M. Hjellming and A.J. Mioduszewski, National Radio Astronomy Observatory,
report: "VLA images at 22.5 GHz made April 5.08 and April 6.94 UT
show that the CI Cam radio source had become resolved.  The extended
emission was just becoming apparent April 5.08, and by April 6.94
it had the appearance of a roughly symmetrical S-shaped twin-jet, 
strikingly similar to the radio jets of SS433.  The outermost pair
of emission components was separated by about 0".33 on April 6.94, so 
if one assumes a beginning at the start of the X-ray outburst on 
March 31.6, the proper motion of each component is 26 mas per day.  
Assuming a distance of 1 kpc (Chkhikvadze (1970) as quoted by Bergner et al.
(A&AS, 112, 221, 1995), this corresponds to apparent tangential velocities 
of 0.15c. The values of proper motion and apparent tangential velocity
may be larger if jet ejection occured after the beginning of the
X-ray outburst. Better constraints on these values will be obtained 
after analysis of a series of images. The presence of relativistic 
jets from CI Cam supports its identification with XTE J0421+560."

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