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Table 6.
Positional RA and Dec offsets of LOFAR compared to other radio surveys as presented in Fig. 9 for compact, isolated, high S/N sources matched within 5″.
| Catalogue | Frequency | Matches | RA offset (″) | RA offset (″) | Dec offset (″) | Dec offset (″) |
|---|---|---|---|---|---|---|
| (MHz) | within 5″ | Histogram | Gaussian | Histogram | Gaussian | |
| TGSS-ADR | 150 | 319 |  |
μ = −0.00, σ = 1.19 |  |
μ = −0.04, σ = 0.97 |
| GMRT | 240 | 310 |  |
μ = +0.11, σ = 1.26 |  |
μ = +0.22, σ = 1.99 |
| GMRT | 610 | 532 |  |
μ = +0.41, σ = 0.81 |  |
μ = −0.37, σ = 1.36 |
| FIRST | 1400 | 738 |  |
μ = −0.35, σ = 0.66 |  |
μ = −0.51, σ = 0.58 |
| VLA | 1500 | 317 |  |
μ = −0.41, σ = 0.35 |  |
μ = −0.50, σ = 0.39 |
Notes. The offsets are described in two ways, firstly by modelling them as Gaussians and secondly using the median, 16th, and 84th percentiles of the offsets.
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