Further radio observations of IGR J00291+5934
ATel #364; M. P. Rupen (GSFC/NRAO), V. Dhawan, A. J. Mioduszewski (NRAO)
on 9 Dec 2004; 20:00 UT
Credential Certification: Michael P. Rupen (mrupen@nrao.edu)
Subjects: Radio, X-ray, Binary, Neutron Star, Transient, Pulsar
Very Large Array (VLA) observations of the millisecond pulsar
IGR J00291+5934 (ATEL #352, ATEL #353) give a clear detection with a flux
density of 0.17 +/- 0.05 mJy at 4.86 GHz on 9 December 2004 (MJD 53348.354).
This flux density basically agrees with that measured by Fender et al. at
nearly the same frequency on 6-7 December 2004 (ATel #361), suggesting that
any decay is not very rapid. The VLA observation by itself was too short
(about one hour) to usefully constrain the short timescale variability.
Further observations are planned.
These data were taken in the VLA's most extended (A) configuration, yielding
a restoring beam of 0.88 x 0.44 asec (FWHM), oriented 73 degrees east of
north. A Gaussian+planar fit to the image gives an upper limit to the
size of 0.53 arcsec FWHM, and a J2000 position within 0.2 arcseconds of the
optical position given in ATel #354:
00 29 03.0822 +/- 0.0055
+59 34 18.99 +/- 0.04
Here the error bars are statistical based on the noise measured near the
source. This position is measured with respect to the ICRF calibrator
J0102+5824, which is 4.5 degrees away, and whose position is known to better
than 2 milliarcseconds.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc.