Birdy in source?

[Katherine Alatalo]

Dear all,

I have been working on some CARMA data for 3C293 (passband 3C273, no CO
lines should be redshifted into my bands, calibrator, 1310+323
gaincal). In my source, there is now a very prominent absorption trough
in the uv data, and I have not been able to find the source of this
issue, and what I can flag to make this birdy go away. Unfortunately it
sits in the middle of band8 (well, band16), which is my primary science
band. The birdy that I attach here in the uvspec in the 10th trial is
also present in all other observations of this source. (Channel maps
also show the prominent sidelobe/error that I am seeing).

I've looked at the maps, and have not been able to ID the problem, and
therefore turn to this group to request assistance. What might I be
missing? Any ideas?
uv data:
https://drive.google.com/file/d/0B0rDH7Zz5FcNcFpOSmRWNVVXSDA/edit?usp=sharing

--
Dr. Katherine Alatalo
Infrared Processing and Analysis Center (IPAC)
California Institute of Technology
http://web.ipac.caltech.edu/staff/kalatalo/

[Peter Teuben]

Katey

has the issue been resolved? I saw some unclipped data Doug Friedel
sent around. Was that the cause?
if it's truely absorbtion , there's a paper by Marscher et al. ApJ 419,
L101 (1993) that gives you an example
of the astronomical case. A followup paper by Moore et al. 1995. ApJ
452:671. Interesting stuff. But these
are just one line against the quasar, you have at least 3, and that's
unexpected.

peter