5 Notes on individual objects

1148-671: The provisional $m\sim 19.3$ optical counterpart proposed by Jauncey for this radio source is incorrect. A comparison of our optical position with the VLBI radio position published by Ma et al. (1997, hereafter Ma) gives (radio-optical): $\Delta\alpha=-0.66\hbox{$^{\prime\prime}$}$ and $\Delta\delta=5.21\hbox{$^{\prime\prime}$}$.Figure 1 shows more or less precisely the position of the radio source. At the limit of our plates ($B \sim 20.5$), no optical object is seen in that position. The finding chart and the radio source position identification were obtained using standard IRAF procedures from a digitized image extracted from the Digitized Sky Survey (DSS), produced by the Space Telescope Science Institute. Unfortunately, this scan is based on a shallow 4 min exposure "supplemental" visual plate of the UK Schmidt Survey, which prevented us from examining the radio source position down to $B\sim 22.5$, the approximate magnitude limit of the "standard" blue UK Schmidt plates.

1937-101: To the best of our knowledge, no finding chart has been published for this object. Figure 2 shows the optical counterpart we propose, based on the small radio-optical residuals derived (see Table 2). The finding chart and the optical identification were obtained, as explained for Fig. 1, from a DSS scan based on a 55 min exposure UK Schmidt blue plate.

  

Figure 1: Finding chart for 1148-671. Chart is 9 arcmin on a side. See Sect. 5 for details

  

Figure 2: Finding chart for 1937-101. Chart is 9 arcmin on a side. See Sect. 5 for details

  

Table 2: Comparison in the ICRS with the VLBI radio positions given by Ma