Follow-up radio observations of the field around the new transient XTE J1450-603
ATel #112; Bob Sault (ATNF), Diana Hannikainen (U. Helsinki), Tasso Tzioumis (ATNF), Kinwah Wu (MSSL/UCL)
on 16 Dec 2002; 10:14 UT
Credential Certification: Diana Hannikainen (diana@astro.helsinki.fi)
Subjects: Radio, X-ray, Transient
We observed the field around XTE J1450-603 (ATel #111) with the
Australia Telescope Compact Array on Dec 6.8 for 2 hours at 3 and 6 cm.
Two sources were found: both are "faint" and are not listed in the PMN
catalog. The flux (at 6 and 3 cm respectively) and position (J2000) of the sources are:
Source A : S(6cm) = 24 mJy, S(3cm) = 22 mJy, RA = 14:50:42.7, DEC = -60:16:55.3
Source B : S(6cm) = 13 mJy, S(3cm) = 7 mJy, RA = 14:49:57.0, DEC = -60:19:06.8
The fluxes are corrected for primary beam effects.
Source B shows a spectral index typical of background radio galaxies.
Two subsequent observations of Source A give
Dec 10.8 : S(6cm) = 24.5 mJy, S(3cm) = 24.1 mJy
Dec 12.8 : S(6cm) = 24.2 mJy, S(3cm) = 23.4 mJy
By centering the field of view on Source A, Source B was now outside the
instrument field-of-view. No other sources were noted in the new field.
We estimate a 3-sigma error of 1.2 mJy on the second and third
observation. Poorer phase stability during the first observation makes
us relucant to quote errors on these measurements: we do not rule out
the apparent variability is a result of phase decorrelation.
We conclude that Source A has not varied and so quite probably
unassociated with the X-ray source.
